摘要
研究了含铜时效钢焊接粗晶区的组织与韧性,并测定了含铜时效钢焊接粗晶区连续冷却转变曲线(SHCCT曲线)。结果表明,冷却速度对含铜时效钢焊接粗晶区的组织和韧性有显著影响。随着冷却速度的增加,粗晶区的组织由粗大的粒状贝氏体转变为细小的板条贝氏体;当t85≤40s时,焊接粗晶区无塑性转变温度低于-50℃,可获得良好的低温韧性。当t85>40s时,焊接粗晶区冲击韧度显著降低,大尺寸M-A组元的增多是导致含铜时效钢韧性恶化的重要原因。
Microstructure and toughness of copper-bearing age hardening steel was studied and SHCCT curve was also measured. The result showed that cooling rate have a great effect on microstructure of coarse-grained zone and the tougness. Microstructure of coarse-grained was changed from thick granular-bainite to thin lath bainite with the increase of cooling rate. It can obtain good NDT results under -50℃ when the cooling time from 800℃ to 500℃ is lower than 40s. On the contrary, the toughness of coarse-grain zone was decrease greatly because of the increase mount of M-A island which was considered to be the important reason leading to deteriorate of coarse-grain toughness.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第6期56-60,共5页
Transactions of The China Welding Institution
关键词
含铜时效钢
粗晶区
韧性
粒状贝氏体
copper-bearing age-hardening steel
coarse-grained zone
toughness
granular-bainite
