Fatigue and Structural Changes of High Interstitial Stainless Austenitic Steels
Fatigue and Structural Changes of High Interstitial Stainless Austenitic Steels
复制标题
高间隙奥氏体不锈钢的疲劳和组织变化
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
L. N. Trophimova
中科院分区：
文献类型：
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作者：
H. Berns;V. Gavriljuk;N. Nabiran;Y. Petrov;S. Riedner;L. N. Trophimova
对含 18 至 19 质量% Cr 和 Mn 的钢在含 0.85 质量% C + N 的铸态条件下以及在最终固溶退火后含 0.96 质量% C + N 的电渣重熔和热加工条件下进行了研究。后者也在 20% 预应变后进行了测试。将拉伸试验的结果与旋转弯曲和推/拉载荷的结果进行比较。较高的C + N含量将0.2%的屈服强度提高至约600 MPa，其中70%保留为107次循环的旋转弯曲疲劳极限，失效概率为50%。预应变进一步改善了该极限，但降低了其与屈服强度的关系。单向载荷和循环载荷下冷作硬化的组织成分相似（平面滑移、位错、孪晶和ε-马氏体），除了后者中的析出物外。氮化物出现在奥氏体中，碳化物出现在ε板中。
Steels with 18 to 19 mass% Cr and Mn each were studied in the as‐cast condition containing 0.85 mass% C + N and in the elektro‐slag‐remelted and hot worked condition containing 0.96 mass% C + N after final solution annealing. The latter was also tested after 20% prestraining. The results of tensile tests were compared to those of rotating bending and push/pull loading. The higher C + N content raised the 0.2% proof strength to about 600 MPa of which 70% were retained as fatigue limit of rotating bending at 107 cycles and a failure probability of 50%. Prestraining further improved this limit but lowered it in relation to the proof strength. The structural components of cold work hardening under unidirectional loading and cyclic loading were similar (planar slip, dislocation, twins and ε‐martensite) except for precipitates in the latter. Nitrides appeared in the austenite and carbides in the ε‐plates.