低温环境对高速列车制动盘材料疲劳裂纹扩展性能影响研究  

STUDY ON INFLUENCE OF LOW TEMPERATURE ENVIRONMENT ON FATIGUE CRACK GROWTH PERFORMANCE OF HIGH-SPEED RAILWAY BRAKE DISC MATEREIAL

作　　者：丁思源 马蕾 石含波 潘俊霖 袁海兵 DING SiYuan;MA Lei;SHI HanBo;PAN JunLin;YUAN HaiBing(School of Mechanical Engineering,Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学机械工程学院流体及动力机械教育部重点实验室,成都610039

出　　处：《机械强度》2022年第5期1082-1090,共9页Journal of Mechanical Strength

基　　金：国家自然科学青年基金项目(51805446);西华大学青年学者后备人才支持计划(DC1900007149),西华大学校内人才引进项目(RZ2000001415)资助。

摘　　要：为研究低温环境对高速列车制动盘材料疲劳裂纹扩展性能的影响,进行了-40℃、-20℃、0℃、室温(20℃)下高铁制动盘特种铸钢材料的拉伸、疲劳裂纹扩展速率试验,对不同温度下高铁制动盘材料力学性能、疲劳裂纹扩展速率性能及其断口形貌进行了分析。研究结果表明:温度的降低对高铁制动盘材料力学性能以及疲劳裂纹扩展性能有显著影响。与室温相比,随着温度的降低,高铁制动盘材料的弹性模量、泊松比、屈服强度、抗拉强度等力学性能参数呈增大趋势。在疲劳裂纹扩展稳定阶段,随着温度的降低,疲劳裂纹扩展速率变小,但随着ΔK的提高,低温对材料疲劳裂纹扩展速率的抑制作用减弱。通过断口分析发现,随着温度的降低,疲劳裂纹扩展极可能由韧性断裂向脆性断裂转变。In order to study the effect of low temperature environment on the fatigue crack growth performance of high-speed train brake disc materials,the tensile and fatigue crack growth rate tests of special cast steel materials of high-speed railway brake disc at-40℃,-20℃,0℃and room temperature(20℃)were carried out.The mechanical properties,fatigue crack growth rate and fracture morphology of high-speed railway brake disc materials at different temperatures were analyzed.The results show that the decrease of temperature has a significant effect on the mechanical properties and fatigue crack propagation of high-speed railway brake disc.Compared with room temperature,the elastic modulus,Poisson′s ratio,yield strength,tensile strength and other mechanical properties of high-speed railway brake disc materials increase with the decrease of temperature.In the stable stage of fatigue crack growth,the fatigue crack growth rate decreases with the decrease of temperature,but the inhibition effect of low temperature on the fatigue crack growth rate decreases with the increase ofΔK.The fracture analysis shows that with the decrease of temperature,the fatigue crack propagation is likely to change from ductile fracture to brittle fracture.

关 键 词：低温 高铁制动盘 疲劳裂纹扩展性能 断口分析 

分 类 号：TH117.1[机械工程—机械设计及理论]