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HE Shiyu LI Ying LIU Jianhong Harbin Institute of Technology , Harbin , China HE Shiyu , Faculty of Metal , Harbin Institute of Technology , Harbin , 150006 , China
金属学报(英文版)
The thermal fatigue behaviour of steel 5CrMnMo after various heat treatments has been examined by means of Coffin-model and self-strained thermal fatigue testing machines.The thermal fatigue crack initiation and propagation have been observed under SEM and TEM. The majority of thermal fatigue cracks of the quenched samples initiated firstly at the grain boundaries and that of the quenched-tempered samples at the breakage interface of the car- bide and matrix.The thermal fatigue cracks of either quenched or quenched-tempered steel propagated mainly along the breakage interface of carbide and grain boundaries.
关键词: thermal fatigue crack , null , null
徐桂芳 , 严羽 , 徐文慧 , 程晓农 , 李冬升
机械工程材料 doi:10.11973/jxgccl201612022
对新型高氮低镍03Cr16Mn14Mo2N奥氏体不锈钢进行了不同上限温度下的热疲劳试验，通过光学显微镜观察了热疲劳裂纹的萌生及扩展，研究了其热疲劳行为.结果表明：热疲劳裂纹的孕育期随上限温度的升高而缩短，其扩展速率随着循环次数的增加呈先增大后减小的变化趋势；随着上限温度的升高，试验钢V型缺口处的裂纹扩展至0．5 mm时所需的热疲劳循环次数显著降低；热疲劳裂纹在 V 型缺口处优先萌生，随着热循环次数的增加，晶界和孪晶界也成为裂纹源，裂纹主要沿晶界扩展.
关键词: 03Cr16Mn14Mo2N钢 , 热疲劳裂纹 , 萌生 , 扩展
孙宜强 , 吴立新 , 周顺兵 , 王志奋
物理测试
为分析转炉烟罩冷却水管早期失效原因,用金相显微镜,扫描电镜,X射线衍射仪等对失效水管进行了检验和分析,结果表明,水管外壁的孔洞是内壁扩展到外壁的热疲劳裂纹,疲劳裂纹是在高温和交变热应力状态下发生的氧腐蚀造成的。
关键词: 烟罩冷却水管 , 热疲劳 , 氧腐蚀
