不同预热温度下马氏体钢焊接性及力学性能研究  

Weldability and mechanical properties of martensitic steel at different preheating temperatures

作　　者：张俊华 刘云韬 贾谦 赵伟刚[3] 孔令明 ZHANG Junhua;LIU Yuntao;JIA Qian;ZHAO Weigang;KONG Lingming(Department of Mechanical Engineering,Xi'an Jiaotong University City College,Xi'an 710018,China;Engineering Research Center of Robot and Intelligent Manufacturing,Universities of Shaanxi Province,Xi'an 710018,China;Xi'an Aerospace Propulsion Institute,China Aerospace Science and Technology Corporation(CASC),Xi'an 710100,China;School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安交通大学城市学院机械工程系,陕西西安710018 [2]机器人与智能制造陕西省高校工程研究中心,陕西西安710018 [3]中国航天科技集团公司西安航天动力研究所,陕西西安710100 [4]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《兵器材料科学与工程》2023年第4期86-93,共8页Ordnance Material Science and Engineering

基　　金：科技部创新方法工作专项(2019IM010203);校级新教工专项(2021X06)。

摘　　要：针对火箭发动机在重复利用中机架等结构焊接件的可靠性提升问题,用G232焊条焊接10Cr13Ni2马氏体钢,通过冷裂纹敏感性、拉伸、冲击试验,研究在不同工艺对钢材的焊接性及焊接接头力学性能的影响,获得最佳焊接工艺对焊接接头受力载荷的影响。结果表明:预热温度为0~250℃时,接头产生冷裂纹倾向小;预热温度由150℃升至250℃时,焊接接头抗拉强度增加,断口由韧性的韧窝-准解理断裂变为接近脆性的韧窝-准解理断裂,经610℃回火后抗拉强度下降;3种工艺对焊接接头热影响区冲击韧性影响均小。In order to improve the reliability of structural weldments such as middle frame of rocket engine in reuse,G232 electrode was used to weld 10Cr13Ni2 martensitic steel.By conducting cold crack sensitivity tests,tensile tests,and impact tests,the effects of different process conditions on the weldability of steel and the mechanical properties of welded joints were studied,and the optimal welding process on the stress load of welded joints were obtained.The results show that when the preheating temperature is between 0‐250℃,there is little tendency for the joint to produce cold cracks.When the preheating temperature increases from 150℃to 250℃,the tensile strength of the welded joint increases,and the fracture changes from dimple‐quasi‐cleavage fracture with good toughness to dimple‐quasi‐cleavage fracture with near brittleness.After tempering at 610℃,the tensile strength decreases.The three process conditions have little effect on the impact toughness of the heat affected zone of the welded joint.

关 键 词：马氏体不锈钢 焊接接头 冷裂纹敏感性 力学性能 

分 类 号：TG407[金属学及工艺—焊接]