焊前及焊后热处理对30CrMnSiA钢搅拌摩擦焊组织及性能研究

打开文本图片集

Research on the microstructure and properties of 30CrMnSiA steel friction stir weldingbefore and after heattreatment

QIUYiqing，YUAN Xing，LUWei，HE Qiang，YAO Xuwei， NI Linbin Shanghai Spaceflight Precision Machinery Research Institute， Shanghai 2O16Oo，China

Abstract：Frictionstir weldingwas carried outon 2mm thick3oCrMnSiA high-strengthsteelin different heat treatment states.The weldingparameters are as follows：rotation speed is 250r/min ，welding speed is 30mm/min .The test plates were subjected to pre-welding heat treatment， post-welding heat treatment and non-heattreatment. The results show that heat treatment can significantly improve the mechanical properties of welded joints.Especially the pre-welding heat treatment process，the pre-weld heat treatment processresults in a high-strength martensitic organization withthesmalest pre-weld grain size of any process under thesameconditions，which results in higher strengths in tensile tests;The post-weld heat treatment due to the more plastic ferite，can also show high tensile strength.

Keywords： 3OCrMnSiA steel; friction stir welding; heat treatment; microstructure; mechanical property

1序言

30CrMnSiA高强钢为典型的Cr-Mn-Si系中碳调质钢。（剩余6033字）