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Liquation cracking susceptibility of partially melted zone in 304B4 SS multipass weldments

  • M. DivyaEmail author
  • Shaju K Albert
  • V. Rajnikanth
Research Paper
  • 13 Downloads

Abstract

AISI 304B4 stainless steel (SS) containing 1.3 wt% boron is reported to be weldable under moderate restraint forces provided welding parameters are chosen carefully. However, during fabrication of components, extensive cracking issues are being reported. Hence, a study involving assessment of base metal, unmixed zone and partially melted zone (PMZ) of 304B4 steel and its welds made using E309 and boron containing consumables on hot cracking is carried out. In this article, results obtained on cracking susceptibility of PMZ formed in this steel are presented and discussed. In order to evaluate hot ductility behavior of PMZ formed in unmixed zone in a multipass weld, PMZ was first simulated using “Gleeble™” thermo-mechanical simulator. Subsequently, hot ductility tests were conducted on this simulated PMZ. Results of the study showed that liquation cracking susceptibility of PMZ of this steel subjected to repeated thermal cycle is higher than that of 304B4 base material. Microstructural analysis of tested specimens showed that formation of Fe-rich ((Fe,Cr)2B + Cr2B) borides in PMZ lowers ductility recovery temperature by 50 °C which results in an increase in cracking factor by 84% of that of base metal. Reasons for high cracking susceptibility of PMZ formed on fused 304B4 have been deduced.

Keywords

Liquation cracking Hot ductility test Borated stainless steel Solidification simulation Eutectic borides Back filling 

Notes

Acknowledgements

The authors acknowledge the support and dedication received from Professor G.D. Janaki Ram and Mr. K. Rangan for his support during hot ductility experiments. The authors also thank Dr. Chitta Ranjan Das, SO/G, MJS, for his valuable support for arranging WDS analysis. The authors are thankful to Dr.Raju, PMD for extending his support for DSC experiments.

References

  1. 1.
    Park TD, Baek KK, Kim DS (1997) PWHT effect on mechanical properties of borated stainless steel GTA weldments for nuclear shield. Met Mater 3:46–50CrossRefGoogle Scholar
  2. 2.
    (2000) Standard specification for borated stainless steel plate, sheet and strip for nuclear applications. ASTM A887, Edition 1989Google Scholar
  3. 3.
    Kumar P, Pai A (2014) An overview of welding aspects and challenges during manufacture of intermediate heat exchangers for 500mwe prototype fast breeder reactor. Proc Eng 86:173–183CrossRefGoogle Scholar
  4. 4.
    Divya M, Albert SK (2018) Dilution effects on weld metal microstructure and liquation cracking susceptibility of 304B4 SS joined using E309 electrode. J Manuf Process 34:540–554CrossRefGoogle Scholar
  5. 5.
    Kou S (2003) Welding metallurgy, 2nd edn. John Wiley & Sons, Inc., Hoboken, pp 252–253 ISBN 0-471-43491-4Google Scholar
  6. 6.
    Srinivasan G, Divya M, Das CR, Albert SK, Bhaduri AK, Lauf S, Stubenrauch S, Klenk A (2015) Weldability studies on borated stainless steel using Varestraint and Gleeble tests. Weld World 59:119–126CrossRefGoogle Scholar
  7. 7.
    Böllinghaus T, Herold H (2005) Hot cracking phenomenon in welds. Springer Berlin Heidelberg, New York, pp 347–375 ISBN 3-540-22332-0CrossRefGoogle Scholar
  8. 8.
    Musech H (1985) Welding of material grade TP347 modified. Nucl Eng Des 85(2):155–161CrossRefGoogle Scholar
  9. 9.
    Shinodo T, Miyake H, Matsuzaka T, Matsumoto T, Kanai H (1992) Hot cracking susceptibility of boron modified AISI 304· austenitic stainless steel welds. Mater Sci Technol 8:913–992CrossRefGoogle Scholar

Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  1. 1.Materials Joining Section, Materials Development & Technology Division, Materials Engineering Group, Indira Gandhi Centre for Atomic ResearchHBNIKalpakkamIndia
  2. 2.MTE Division NML Burmamines-P.O.JamshedpurIndia

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