The microstructure and mechanical properties of welded joint of TMCP890 are studied by means of thermal simulation and gas metal arc welding. It is found that the heat-affected zone has high toughness after welding. After welding with 900-MPa grade filler wire, the weld metal has good toughness and the strength of welded joint is comparable to that of the steel. Two hundred fifty degrees celsius postweld heat treatment does not affect the strength and toughness of welded joint. After 480 °C postweld heat treatment, the strength is a little lowered and toughness of weld metal and heat-affected zone is reduced remarkably. After 600 °C postweld heat treatment, the strength and toughness of weld metal and heat-affected zone are damaged seriously. Light optical microscope, SEM, TEM, and EBSD are used to analyze the microstructure of experimental samples. It is found that filmy residual austenite and low quantity of M-A constitutes with small size contribute to the high toughness of heat-affected zone in a great deal. The adverse effect of high-temperature postweld heat treatment on toughness is because of the large-sized precipitated particles.
This is a preview of subscription content, log in to check access.
Cui B, Peng Y, Zhao L, Peng M, Tongbang AN, Ma C (2016) Effect of heat input on microstructure and toughness of coarse grained heat affected zone of Q890 steel. ISIJ Int 56(1):132–139CrossRefGoogle Scholar
Zhang Y, Peng Y, Ma C, Peng X, Tian Z, Lu J (2013) Harden quenching tendency and cold cracking susceptibility of Q890 steel during welding. Trans Chin Weld Inst 34(6):53–56Google Scholar
Bonnevie E, Ferrière G, Ikhlef A et al (2004) Morphological aspects of martensite-austenite constituents in intercritical and coarse grain heat affected zones of structural steels. Mater Sci Eng A 385(1–2):352–358CrossRefGoogle Scholar
Bayraktar E, Kaplan D (2004) Mechanical and metallurgical investigation of martensite-austenite constituents in simulated welding conditions. J Mater Process Technol 153-154(10):87–92CrossRefGoogle Scholar
Bose FWW, Carvalho ALM, Bowen P (2007) Micro mechanisms of cleavage fracture initiation from includions in ferritic welds PII. Quantification of local fracture behaviour observed in fatigue pre-cracked in test pieces. Mater Sci Eng A 460–461:436–452CrossRefGoogle Scholar
Sanghoon K, Donghwan K, Kim TW et al (2011) Fatigue crack growth behavior of the simulated HAZ of 800MPa grade high-performance steel. Mater Sci Eng A 528:2331–2338CrossRefGoogle Scholar
Cho SH, Kang KB, Jonas JJ (2001) The dynamic, static and metadynamic recrystallization of a Nb-microalloyed steel. ISIJ Int 41:63–69CrossRefGoogle Scholar
Cho SH, Kang KB, Jonas JJ (2001) Mathematical modeling of the recrystallization kinetics of Nb-microalloyed steels. ISIJ Int 41:766–773CrossRefGoogle Scholar
Wang RZ, Lei TC (1994) Dynamic recrystallization of ferrite in a low carbon steel during hot rolling in the (F+a) two-phase range. Scr Met Mater 31:1191–1197Google Scholar
Peng Y, Wang A, Xiao H, Tian Z (2012) Effect of cu on microstructure forming and refining of weld metal in 690 MPa grade HSLA steel. Acta Metall Sin 48(11):1281–1289CrossRefGoogle Scholar
Peng Y, Peng X-n, Zhang X-m, Tian Z-l, Wang T (2014) Microstructure and mechanical properties of GMAW weld metal of 890 MPa class steel. J Iron Steel Res Int 21(5):539–544CrossRefGoogle Scholar
Zhao HY, Zhou L, Chen B et al (2011) Effect of cooling condition on microstructure and mechanical properties in large line energy welded joints of ultra fine grained steel. Adv Mater Res 189:3345–3350CrossRefGoogle Scholar
Peng Y, Wang A, Xiao H, Tian Z (2012) Effect of interpass temperature on microstructure and mechanical properties of weld metal of 690 MPa HSLA steel. Mater Sci Forum 706-709:2246–2252CrossRefGoogle Scholar
Yurioka N, Suzuki H (1990) Hydrogen assisted cracking in C-Mn and low alloy steel weldments [J]. Int Mater Rev 35(4):112–115Google Scholar