摘要
采用Gleeble 2000热模拟试验机,对16 mm厚TMCP型Q550D钢进行了焊接热模拟试验,研究了焊接线能量对热影响区粗晶区组织和性能的影响规律。结果表明,粗晶区主要组织为板条状贝氏体,当线能量高于20 kJ/cm时,还出现少量粒状贝氏体。随着线能量提高,原始奥氏体晶粒和贝氏体板条逐渐粗化,粒状贝氏体含量逐渐增加。粗晶区冲击功随着线能量提高逐渐降低,超过20 kJ/cm时冲击韧性明显下降。当线能量小于20 kJ/cm时粗晶区发生硬化,随着线能量提高,硬度值逐渐降低。
The welding thermal simulation test on the 16 mm thick TMCP processed Q550 Dsteel was carried out by Gleeble 2000 thermal simulation testing machine,and the effect of line energy on the microstructure and mechanical properties of CGHAZ was researched.The results showed that the main microstructure of CGHAZ was lath bainite,and a small amount of granular bainite appeared when line energy was over 20kJ/cm.With the increase of line energy,the original austenite grain size and bainite lath coarsened,and the granular bainite content increased gradually.The impact energy gradually decreased with the increase of line energy and it significantly deteriorated when the line energy was above 20kJ/cm.The CGHAZ was hardened when the line energy was below 20kJ/cm.With the increase of line energy,the CGHAZ hardness decreased gradually.
出处
《钢铁研究》
CAS
2016年第6期36-38,共3页
Research on Iron and Steel
关键词
Q550D钢
焊接热模拟
组织
性能
Q550D steel
welding thermal simulation
microstructure
property
