焊后热处理对X80和30CrMo钢热影响区粗晶区韧性的影响
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摘要
通过冲击、金相试验和扫描电镜分析,研究了焊后热处理(PWHT)对X80钢和30CrMo钢热影响区粗晶区韧性的影响。结果表明,X80钢侧焊态和PWHT后粗晶区组织均主要为板条贝氏体和粒状贝氏体;30CrMo钢侧焊态粗晶区组织主要为贝氏体和低碳马氏体,PWHT后粗晶区组织为贝氏体和回火索氏体。M/A组元的形成是造成X80侧钢焊态粗晶区韧性较低的主要原因,而30CrMo钢侧焊态粗晶区韧性较差是组织粗化及上贝氏体的形成造成的。PWHT后,热影响区粗晶区的韧性明显改善,这主要是由于粗晶区组织细化,脆硬组织数量变少,应力集中程度降低。
The effect of post weld heat treatment(PWHT) on impact toughness of coarse-grained heat-affected zone(CGHAZ) of X80 and 30 CrMo steels was systematically investigated by using impact test, metallographic examination and SEM. The results show that the welded and PWHT microstructures of CGHAZ of X80 side are lath bainite and granular bainite. The welded microstructures of CGHAZ of 30 CrMo side are bainite and low-carbon martensite, and the microstructures are bainite and tempered sorbite after PWHT. Low impact toughness in the welded CGHAZ of X80 side is mainly caused by the appearance of M/A constituent, and that in the welded CGHAZ of 30 CrMo side is mainly caused by the coarse structure and the formation of upper bainite. After PWHT, the toughness of CGHAZ is significantly improved. The main reason may be that the microstructures of CGHAZ are refined, the quantity of the brittle microstructures reduce and the stress concentration decreases.
The effect of post weld heat treatment(PWHT) on impact toughness of coarse-grained heat-affected zone(CGHAZ) of X80 and 30 CrMo steels was systematically investigated by using impact test, metallographic examination and SEM. The results show that the welded and PWHT microstructures of CGHAZ of X80 side are lath bainite and granular bainite. The welded microstructures of CGHAZ of 30 CrMo side are bainite and low-carbon martensite, and the microstructures are bainite and tempered sorbite after PWHT. Low impact toughness in the welded CGHAZ of X80 side is mainly caused by the appearance of M/A constituent, and that in the welded CGHAZ of 30 CrMo side is mainly caused by the coarse structure and the formation of upper bainite. After PWHT, the toughness of CGHAZ is significantly improved. The main reason may be that the microstructures of CGHAZ are refined, the quantity of the brittle microstructures reduce and the stress concentration decreases.
引文
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[6]李亚江,栗卓新,陈芙蓉,等.焊接冶金学-材料焊接性[M].第2版.北京:机械工业出版社, 2016:284-285.
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