Mechanical properties of low-transformation-temperature weld metals after low-temperature postweld heat treatment

作者：Wu, Shipin; Wang, Dongpo; Zhang, Zhi; Li, Chengning; Liu, Xiuguo; Meng, Xianqun; Feng, Zhongyuan; Di, Xinjie^*

来源：Science and Technology of Welding and Joining, 2019, 24(2): 112-120.

DOI：10.1080/13621718.2018.1492776

• Low-transformation-temperature welding material
• stability of retained austenite
• postweld heat treatment
• martensitic transformation
• toughness
• transformation-induced plasticity effect

The as-welded low-transformation-temperature (LTT) weld metal with martensite/retained austenite (RA) dual phase exhibits high toughness and ductility, but the yield strength (YS) is very low. After low-temperature postweld heat treatment at 300 degrees C, the YS, toughness and ductility of dual-phase LTT weld metal increase dramatically, while there is a slight effect on mechanical properties of full martensite LTT weld metal. During the low-temperature postweld heat treatment, carbon atoms diffuse from martensite into RA, which increases the stability of RA. The improvements of mechanical properties for dual-phase LTT weld metal after low-temperature postweld heat treatment are attributed to the increased stability of RA and enhanced transformation-induced plasticity effect.

• 出版日期2019-2-17
• 单位天津大学