摘要
用搅拌摩擦焊接(friction stir welding,FSW)对相变诱发塑性(transformation-induced plasticity,TRIP)钢焊接,研究转速对TRIP钢显微组织和力学性能的影响。结果表明:FSW接头焊合区(stir zone,SZ)和热机械影响区(thermo-mechanically affect zone,TMAZ)晶粒细化、残余奥氏体含量降低,有大量马氏体生成;热影响区(heat-affected zone,HAZ)晶粒粗化、残余奥氏体含量降低,无马氏体生成。相比母材,FSW接头SZ和TMAZ显微硬度提升,HAZ显微硬度下降;低转速下,FSW接头中残余奥氏体含量较高,接头的抗拉强度912 MPa,达到母材的92.9%。母材和接头断口均呈韧性断裂特征。
In this work,friction stir welding(FSW)was used for transformation-induced plasticity(TRIP)steel welding,and the effect of rotation rate on the microstructure and mechanical properties of the joints were investigated.The results show that the grains are refined,the retained austenite content reduces,and a large amount of martensite form in stir zone(SZ)and thermomechanically affected zone(TMAZ).The grains are coarsened,the retainedaustenite content reduces and no martensite forms in heat-affected zone(HAZ).Compared with the base material,the microhardness of SZ and TMAZ of FSW joints increase,and in HAZ the microhardness reduces.At low rotation rate,the retained austenite content is high in the joints,thus the tensile strength reaches 912 MPa,which is up to 92.9%of base metal.The base metal and joints tensile fractures show the character of ductile fracture.
作者
张升懿
王快社
乔柯
王文
袁胜男
ZHANG Shengyi;WANG Kuaishe;QIAO Ke;WANG Wen;YUAN Shengnan(School of Metallurgical Engineering,Xif an University of Architecture and Technology,Xi'an 710055,China;National and Local Joint Engineering Research Center for Functional Materials Processing,Xi'an University of Architecture and Technology,Xi’an 710055,Cliina;Material Processing Teaching Demonstration Center,Xi'an University of Architecture and Technology,Xi’an 710055,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第4期56-61,共6页
Ordnance Material Science and Engineering
基金
陕西省自然科学基金(2019JQ-769)
西安市科技计划科技创新引导项目(201805033YD11CG17(8))。
关键词
TRIP钢
搅拌摩擦焊接
转速
显微组织
力学性能
TRIP steel
friction stir welding
rotation rate
microstructure
mechanical properties
