摘要
利用热电偶测出X80管线钢SMAW(手工电弧焊)和GMAW(熔化极气体保护焊)的焊接热循环,结合金相组织分析、焊接热影响区最高硬度试验方法和焊接用插销试验方法,研究不同热循环对X80管线钢冷裂敏感性的影响。结果表明,随冷却速度增加,下贝氏体增多,硬度增大,无马氏体出现;最高硬度H max远低于350 HV10,且下临界应力σcr>0.75R t0.5,说明X80管线钢具有良好的抗冷裂纹能力。
By using thermocouple measured SMAW （ shielded metal arc welding） and GMAW （ gas metal arc welding） heat cycle, and combining microstructure analysis, welding heat affected zone highest hardness testing and implant test method, the effect of different heat cycle on cold crack sensitivity of X80 pipeline steel was researched. The results show that, with the increase of cooling speed, the lower bainite and hardness increase, while martensite does not appear, and the highest hardness is far below 350 HV10, lower critical stress σer is also more than 0.75 Rt0.5, which indicated that X80 pipeline steel has good resistance to cold cracking.
出处
《金属热处理》
CAS
CSCD
北大核心
2013年第9期26-29,共4页
Heat Treatment of Metals
基金
四川省高等学校油气田材料重点实验室项目(12YQT025)
关键词
热循环
X80管线钢
冷裂敏感性
thermal cycle
X80 pipeline steel
cold cracking sensitivity
