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Critical Quenching Rates After Solution Annealing: Peculiarities of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion

  • S. Hafenstein
  • L. HitzlerEmail author
  • E. Sert
  • A. Öchsner
  • M. Merkel
  • E. Werner
Conference paper
  • 702 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Hot isostatic pressing is commonly used to reduce the porosity of (sand-)cast age-hardenable Al-alloys in order to meet the high quality requirements defined by aircraft and automotive industries. In order to establish additive manufacturing methods, such as laser powder-bed fusion (L-PBF), hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties in as-built condition and at the same time eliminate porosity. For the cast aluminum alloy A356, a gas pressure of 75 MPa during hot isostatic pressing lowers the critical cooling rate required to achieve an oversaturated solid solution to about 1 K/s, which is significantly lower than the required quenchingrate at atmospheric pressure (2–4 K/s). Thus, an oversaturated state of dissolved magnesium and silicon atoms within the aluminum matrix of cast alloys can easily be achieved in modern hot isostatic presses, thereby avoiding the necessity of a separate solution annealing step. In this work, we applied hot isostatic pressing followed by rapid quenching and direct aging to age-hardenable aluminum alloys processed by both sand casting and laser powder-bed fusion. It was shown that the proposed process of direct aging could be utilized for post-heat treatment of additively manufactured age-hardenable aluminum alloys to open up new fields of applications, for which components have to possess a high fatigue resistance.

Keywords

Laser powder-bed fusion Selective laser melting Additive manufacturing Fatigue resistance Hot isostatic pressing Critical cooling rate 

References

  1. 1.
    Hitzler L, Hirsch J, Heine B, Merkel M, Hall W, Öchsner A (2017) On the anisotropic mechanical properties of selective laser melted stainless steel. Materials 10(10):1136CrossRefGoogle Scholar
  2. 2.
    Houria IM, Nadot Y, Fathallah R, Roy M, Maijer DM (2015) Influence of casting defect and SDAS on the multiaxial fatigue behaviour of A356–T6 alloy including mean stress effect. Int J Fatigue 80:90–102CrossRefGoogle Scholar
  3. 3.
    Ceschini L, Morri A, Toschi S, Seifeddine S (2016) Room and high temperature fatigue behaviour of the A354 and C355 (Al–Si–Cu–Mg) alloys: role of microstructure and heat treatment. Mater Sci Eng A 653:129–138CrossRefGoogle Scholar
  4. 4.
    Wang QG, Apelian D, Lados DA (2001) Fatigue behavior of A356-T6 aluminum cast alloys. Part I. effect of casting defects. J Light Met 1(1):73–84Google Scholar
  5. 5.
    Yi JZ, Gao YX, Lee PD, Lindley TC (2004) Effect of Fe-content on fatigue crack initiation and propagation in a cast aluminum-silicon alloy (A356–T6). Mater Sci Eng A 386(1–2):396–407CrossRefGoogle Scholar
  6. 6.
    Han S-W, Kumai S, Sato A (2002) Effects of solidification structure on short fatigue crack growth in Al–7%Si–0.4%Mg alloy castings. Mater Sci Eng A 332(1–2):56–63Google Scholar
  7. 7.
    Hitzler L, Janousch C, Schanz J, Merkel M, Mack F, Öchsner A (2016) Non-destructive evaluation of AlSi10Mg prismatic samples generated by selective laser melting: influence of manufacturing conditions. Materialwissenschaft und Werkstofftechnik 47(5–6):564–581CrossRefGoogle Scholar
  8. 8.
    Hitzler L, Merkel M, Hall W, Öchsner A (2018) A review of metal fabricated with laser- and powder-bed based additive manufacturing techniques: process, nomenclature, materials, achievable properties, and its utilization in the medical sector. Adv Eng Mater 20(5):1700658CrossRefGoogle Scholar
  9. 9.
    Aboulkhair NT, Maskery I, Tuck C, Ashcroft I, Everitt NM (2016) The microstructure and mechanical properties of selectively laser melted AlSi10Mg: the effect of a conventional T6-like heat treatment. Mater Sci Eng A 667:139–146CrossRefGoogle Scholar
  10. 10.
    Hitzler L, Hirsch J, Schanz J, Heine B, Merkel M, Hall W, Öchsner A (2019) Fracture toughness of selective laser melted AlSi10Mg. Proc Inst Mech Eng Part L J Mater Des Appl 233(4):615–621CrossRefGoogle Scholar
  11. 11.
    Kimura T, Nakamoto T (2016) Microstructures and mechanical properties of A356 (AlSi7Mg0.3) aluminum alloy fabricated by selective laser melting. Mater Des 89:1294–1301Google Scholar
  12. 12.
    Hafenstein S, Werner E, Wilzer J, Theisen W, Weber S, Sunderkötter C, Bachmann M (2015) Influence of temperature and tempering conditions on thermal conductivity of hot work tool steels for hot stamping applications. Steel Res Int 86(12):1628–1635CrossRefGoogle Scholar
  13. 13.
    Hafenstein S, Werner E, Wilzer J, Theisen W, Weber S, Sunderkötter C, Bachmann M (2017) Einfluss der Temperatur und des Vergütungszustands auf die Wärmeleitfähigkeit von Warmarbeitsstählen für das Presshärten. HTM J Heat Treat Mater 72(2):81–86CrossRefGoogle Scholar
  14. 14.
    Aboulkhair NT, Simonelli M, Parry L, Ashcroft I, Tuck C, Hague R 3D printing of aluminium alloys: additive manufacturing of aluminium alloys using selective laser melting. Progr Mater SciGoogle Scholar
  15. 15.
    Prashanth KG, Scudino S, Klauss HJ, Surreddi KB, Löber L, Wang Z, Chaubey AK, Kühn U, Eckert J (2014) Microstructure and mechanical properties of Al–12Si produced by selective laser melting: effect of heat treatment. Mater Sci Eng A 590:153–160CrossRefGoogle Scholar
  16. 16.
    Hitzler L, Janousch C, Schanz J, Merkel M, Heine B, Mack F, Hall W, Öchsner A (2017) Direction and location dependency of selective laser melted AlSi10Mg specimens. J Mater Process Technol 243:48–61CrossRefGoogle Scholar
  17. 17.
    Hitzler L, Charles A, Öchsner A (2016) The influence of post-heat-treatments on the tensile strength and surface hardness of selective laser melted AlSi10Mg. Defect Diff Forum 370:171–176CrossRefGoogle Scholar
  18. 18.
    Heilgeist S, Hitzler L, Javanbakht Z, Merkel M, Heine B, Öchsner A (2019) The influence of post-heat treatments on the tensile strength and surface hardness of selectively laser-melted AlSi10Mg. Materialwissenschaft und Werkstofftechnik 50(5):546–552CrossRefGoogle Scholar
  19. 19.
    Sert E, Schuch E, Hitzler L, Werner E, Öchsner A, Merkel M (2019) Tensile strength performance with determination of Poisson’s ratio of additively manufactured AlSi10Mg samples. Materialwissenschaft und Werkstofftechnik 50(5):539–545CrossRefGoogle Scholar
  20. 20.
    Hitzler L, Schoch N, Heine B, Merkel M, Hall W, Öchsner A (2018) Compressive behaviour of additively manufactured AlSi10Mg. Materialwissenschaft und Werkstofftechnik 49(5):683–688CrossRefGoogle Scholar
  21. 21.
    Graf W (2008) HIP und Wärmebehandlung von Aluminiumguss—Zwei Prozesse werden neu kombiniert. Zeitschrift für Werkstoffe, Wärmebehandlung, Fertigung 63(3):168–173Google Scholar
  22. 22.
    Tammas-Williams S, Withers PJ, Todd I, Prangnell PB (2016) Porosity regrowth during heat treatment of hot isostatically pressed additively manufactured titanium components. Scripta Mater 122:72–76CrossRefGoogle Scholar
  23. 23.
    Wang Z, Shi Y, Li R, Wei Q (2011) Manufacturing AISI316L components via selective laser melting coupled with hot isostatic pressing 675–677, pp 853–856Google Scholar
  24. 24.
    Lavery NP, Cherry J, Mehmood S, Davies H, Girling B, Sackett E, Brown SGR, Sienz J (2017) Effects of hot isostatic pressing on the elastic modulus and tensile properties of 316L parts made by powder bed laser fusion. Mater Sci Eng A 693:186–213CrossRefGoogle Scholar
  25. 25.
    Jacobs MH (1972) The structure of the metastable precipitates formed during ageing of an Al–Mg–Si alloy. Philos Mag 26(1):1–13CrossRefGoogle Scholar
  26. 26.
    Edwards GA, Stiller K, Dunlop GL, Couper MJ (1998) The precipitation sequence in Al–Mg–Si alloys. Acta Mater 46(11):3893–3904CrossRefGoogle Scholar
  27. 27.
    Dutta I, Allen SM (1991) A calorimetric study of precipitation in commercial aluminium alloy 6061. J Mater Sci Lett 10:323–326CrossRefGoogle Scholar
  28. 28.
    Andersen SJ, Zandbergen HW, Jansen C, Tundal U, Reiso O (1998) The crystal structure of the beta\(\prime \prime \) phase in Al–Mg–Si alloys. Acta Mater 46(9):3283–3298CrossRefGoogle Scholar
  29. 29.
    Hafenstein S, Brummer M, Ahlfors M, Werner E (2016) Combined hot isostatic pressing and heat treatment of aluminum A356 cast alloys. HTM J Heat Treat Mater 71(3):117–124CrossRefGoogle Scholar
  30. 30.
    Hafenstein S, Brummer M, Ahlfors M, Werner E (2016) Kombiniertes Heißisostatisches Pressen (HIP) und Wärmebehandlung von einer A356 Aluminiumgusslegierung. Giesserei Praxis 7–8:316–321Google Scholar
  31. 31.
    Hafenstein S, Werner E (2018) Simultaneous hot isostatic pressing and solution annealing of aluminum cast alloys followed by instantaneous aging at elevated temperatures. IOP Conf Ser Mater Sci Eng 416:012084CrossRefGoogle Scholar
  32. 32.
    Murali S, Arunkumar Y, Chetty PVJ, Raman KS, Murthy KSS (1997) The effect of preaging on the delayed aging of Al–7Si–0.3Mg. JOM 49(2):29–33Google Scholar
  33. 33.
    Carrera E, Alejandro GJ, Talamantes SJ, Colás R (2011) Effect of the delay in time between cooling and aging in heat-treated cast aluminum alloys. Metal Mater Trans B 42(5):1023–1030CrossRefGoogle Scholar
  34. 34.
    Zhen L, Kang SB (1997) The effect of pre-aging on microstructure and tensile properties of Al–Mg–Si alloys. Scripta Mater 36(10):1089–1094CrossRefGoogle Scholar
  35. 35.
    Ceschini L, Morri A, Morri A (2013) Effects of the delay between quenching and aging on hardness and tensile properties of A356 aluminum alloy. J Mater Eng Perf 22(1):200–205CrossRefGoogle Scholar
  36. 36.
    DIN EN 1706:2010, Aluminium und Aluminiumlegierungen—Gussstücke—Chemische Zusammensetzung und mechanische Eigenschaften; Deutsche Fassung (Dezember 2013)Google Scholar
  37. 37.
    Hafenstein S (2019) Heißisostatisches Pressen von Aluminiumgusslegierungen mit integrierter Wärmebehandlung, Springer ViewegGoogle Scholar
  38. 38.
    DIN EN ISO 6506-2, Metallische Werkstoffe—Härteprüfung nach Brinell—Teil 2: Überprüfung und Kalibrierung der Prüfmaschinen (April 2016)Google Scholar
  39. 39.
    Schindelbacher G (1993) Einfluss unterschiedlicher Porosität auf die mechanischen Eigenschaften der Legierung GD-AlSi9Cu3. Giesserei Praxis 19:381–392Google Scholar
  40. 40.
    Skrinsky Y (2002) Einfluß von heiß- und kaltisostatischem Pressen auf die statischen mechanischen Werkstoffkennwerte von Gußteilen aus Aluminiumlegierungen. Dissertation, Otto-von-Guericke-Universität, MagdeburgGoogle Scholar
  41. 41.
    Zhang DL, Zheng L (1996) The quench sensitivity of cast Al-7 wt pct Si-0.4 wt pct Mg alloy. Metal Mater Trans A 27(12):3983–3991Google Scholar
  42. 42.
    Sjölander E, Seifeddine S, Fracasso F (2015) Influence of quench rate on the artificial ageing response of an Al–8Si–0.4Mg cast alloy. Mater Sci Forum, 219–225Google Scholar
  43. 43.
    Seifeddine S, Timelli G, Svensson IL (2007) On the influence of quenching rate on the microstructural and mechanical properties of aluminium cast alloys A356 and A354. Int Found Res/Giessereiforschung 59(1):1–10Google Scholar
  44. 44.
    Mehrer H (2007) Diffusion in solids: fundamentals, methods, materials, diffusion-controlled processes, vol 155 of Springer series in solid-state sciences, SpringerGoogle Scholar
  45. 45.
    Blank VD, Estrin EI (2014) Phase transitions in solids under high pressure. CRC PressGoogle Scholar
  46. 46.
    Rottstegge AK (2017) Strukturbildungsprozesse von Eisenbasislegierungen beim heißisostatischen Pressen. Dissertation, Ruhr-Universität Bochum, BochumGoogle Scholar
  47. 47.
    Sundquist BE (1969) The effect of alloying elements and pressure on the growth of pearlite. Acta Metal 17(8):967–978CrossRefGoogle Scholar
  48. 48.
    Coates DE (1973) Diffusional growth limitation and hardenability. Metal Trans 4(10):2313–2325CrossRefGoogle Scholar
  49. 49.
    Bhadeshia H, Honeycombe RWK (2007) Steels: microstructure and properties, 3rd edn. Butterworth-Heinemann, ElsevierGoogle Scholar
  50. 50.
    Hafenstein S, Werner E (2019) Pressure dependence of age-hardenability of aluminum cast alloys and coarsening of precipitates during hot isostatic pressing. Mater Sci Eng A 757:62–69CrossRefGoogle Scholar
  51. 51.
    Dorward RC (1973) Preaging effects in Al–Mg–Si alloys. Metal Trans 4(2):507–512CrossRefGoogle Scholar
  52. 52.
    Sjölander E, Seifeddine S (2010) The heat treatment of Al–Si–Cu–Mg casting alloys. J Mater Process Technol 210(10):1249–1259CrossRefGoogle Scholar
  53. 53.
    Geuser FD, Lefebvre W, Blavette D (2006) 3D atom probe study of solute atoms clustering during natural ageing and pre-ageing of an Al–Mg–Si alloy. Phil Mag Lett 86(4):227–234CrossRefGoogle Scholar
  54. 54.
    Murayama M, Hono K (1999) Pre-precipitate clusters and precipitation processes in Al–Mg–Si alloys. Acta Mater 47(5):1537–1548CrossRefGoogle Scholar
  55. 55.
    Serizawa A, Hirosawa S, Sato T (2008) Three-dimensional atom probe characterization of nanoclusters responsible for multistep aging behavior of an Al–Mg–Si alloy. Metal Mater Trans A 39(2):243–251CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • S. Hafenstein
    • 1
  • L. Hitzler
    • 1
    Email author
  • E. Sert
    • 2
  • A. Öchsner
    • 2
  • M. Merkel
    • 3
  • E. Werner
    • 1
  1. 1.TUM Department of Mechanical Engineering, Institute of Materials Science and Mechanics of MaterialsTechnical University of MunichGarching bei MünchenGermany
  2. 2.Faculty of Mechanical EngineeringEsslingen University of Applied SciencesEsslingenGermany
  3. 3.Faculty of Mechanical Engineering and Materials ScienceAalen University of Applied SciencesAalenGermany

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