摘要
针对航天器产品恶劣工况对材料及连接方式高抗拉、抗剪强度力学性能的需求,设计试验验证了深低温至高温环境下真空钎焊与火焰钎焊试样拉伸与剪切性能:真空钎焊在-233℃条件下抗拉强度可达536 MPa、剪切强度可达260 MPa、-150℃时剪切强度300 MPa、常温剪切强度212 MPa,低温下剪切强度值更高且皆优于火焰钎焊对应温度下试样的结果。同时研究了真空钎焊工艺对合金钢40CrNiMoA材料性能的影响,真空钎焊工艺加工过程使材料本身抗拉强度下降约38%,表面硬度值下降约25%。并测量了真空钎焊试样200℃高温条件下抗拉强度为804 MPa,剪切强度为239 MPa。通过试验研究了不同焊接工艺对结构焊接后力学性能的影响,该试验结果对后续航天器结构设计工作具有一定的指导作用。
In view of the requirements of high tensile strength and shear strength mechanical properties of materials and connection methods for spacecraft products under harsh working conditions,experiments designed aim to verify the tensile and shear properties of vacuum brazing and flame brazing specimens in profound hypothermia to high temperature environments.Vacuum brazing samples show significantly better results than those of flame brazing.The tensile strength of vacuum brazing specimens can reach 536 MPa at-233℃and the shear strength 260 MPa.The shear strength of vacuum brazing specimens is 300 MPa at-150℃,and shear strength in the normal temperature is 212 MPa.Furthermore,the effect of vacuum brazing process on the properties of alloy steel 40CrNiMoA has been studied.The vacuum brazing process reduces the tensile strength by about 38%and the surface hardness by about 25%.As the results indicated,the tensile strength and shear strength of the vacuum brazing samples at 200℃are 804 MPa and 239 MPa,respectively.The effects of different welding processes on the mechanical properties of the structure after welding are studied through the experiments.The test results play an instructive role for the follow-up spacecraft structure designs.
作者
高泽
刘博
郑立彦
王国欣
莫桂冬
孙启臣
GAO Ze;LIU Bo;ZHENG Liyan;WANG Guoxin;MO Guidong;SUN Qichen(Beijing Spacecrafts Co.,Ltd.,Beijing 100094,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2022年第3期404-410,共7页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
真空钎焊
深低温
抗拉强度
抗剪强度
火焰钎焊
vacuum brazing
low temperature
tensile strength
Shear strength
flame brazing
