摘要
超细晶粒钢的强度和韧性比普通晶粒钢有大幅度的提高,其焊接性是该钢能否获得广泛应用的关键。通过采用实际焊接和焊接热模拟方法,研究了焊接热输入对超细晶粒钢组织和力学性能的影响。研究结果表明,超细晶粒钢的奥氏体晶粒长大倾向与普通晶粒钢相近,在热影响区和母材之间存在一再结晶软化区,板厚小于3mm时,粗晶热影响区的裂纹扩展吸收能大于母材,板厚大于5mm时,粗晶热影响区韧性比母材有较大幅度降低。对影响粗晶热影响区韧性的机理进行了探讨。
The strength and toughness of ultra-fine grained steel areraised a great deal compared to the normal grain steel. Weldability of ul-tra-fine grained steel is important for application of the steel. In this paperwelding and thermal simulation are conducted to study the effect of weld-ing heat input on the microstructures and mechanical properties of thesteel. Experimenal results indicate that the tendency of austenite graingrowth of ultra-fine grained steel is almost the same as normal grain steel.There is a softened zone between heat affected zone and base metal be-cause of recrystallization. For the steel plate thinner than 3 mm, the ab-sorption energy of crack propagating in coarse grain HAZ is higher thanthat of base metal. For the steel plate thicker than 5 mm,the toughness ofcoarse grain HAZ is nmch lower than that of base metal. The mechanismthat affects the toughness of coarse grain HAZ is studied.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2003年第5期21-24,共4页
Transactions of The China Welding Institution
基金
国家重点基础研究规划资助项目(973)
