Improvement of fatigue strength of maraging steel by nitriding
Improvement of fatigue strength of maraging steel by nitriding
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氮化提高马氏体时效钢疲劳强度
DOI：
10.1299/kikaia.67.314
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
E. Kondo
中科院分区：
文献类型：
--
作者：
N. Kawagoishi;K. Fukada;K. Morino;Quing;E. Kondo
通过旋转弯曲疲劳试验，研究了径向氮化对马氏体时效钢表面完整性和疲劳强度的影响。渗氮可提高疲劳强度。时效钢的断裂起始点在表面，而氮化钢的断裂起始点在高应力水平下为试样表面，在低应力水平下为试样内部。导致表面断裂的主要原因是表面脆化，导致内部断裂的主要原因是渗氮导致的表面硬化。结果表明，氮化马氏体时效钢的S-N曲线呈双阶段曲线。
Rotating bending fatigue tests were carried out to investigate the influence of radical nitriding on the surface integrity and the fatigue strength for a maraging steel. Fatigue strength increased by nitriding. Although the initiation site of fracture was the surface in the aged steel, it was the specimen surface at high stress levels and the interior at low stress levels in the nitrided steel. The main reason for the surface fracture was the surface embrittlement and the one for the interior fracture was the surfce hardening due to nitriding. As the results, S-N curves of the nitrided maraging steel showed a double staged curve.