Effects of Prestrain on Fatigue Behaviour in Type 316 Stainless Steel
Effects of Prestrain on Fatigue Behaviour in Type 316 Stainless Steel
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预应变对 316 型不锈钢疲劳行为的影响
DOI：
10.1299/kikaia.73.796
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
K. Tokaji
中科院分区：
文献类型：
--
作者：
M. Nakajima;M. Akita;Y. Uematsu;K. Tokaji
研究了预应变316奥氏体不锈钢的疲劳行为。进行了两种类型的疲劳试验，即在实验室空气和3%NaCl溶液中的常规S-N试验和应力增量试验。所评估的拉伸预应变为5%、15%、25%和58%。在实验室空气中，疲劳强度随着预应变的增加而增加，这归因于加工硬化和应变诱发马氏体相变。在3%NaCl溶液中，所有试样的疲劳强度均比空气中的试样有所下降，且在15%预应变以下，疲劳强度随预应变的增加而增加，但在15%预应变以上，疲劳强度显著下降。腐蚀坑的产生和增长的转变马氏体相被认为是主要负责所观察到的行为。根据应力增量试验结果，随着预应变的增加，同轴效应变得不那么明显，在15%时消失，然后在25%和58%的较大预应变下再次出现。所观察到的腐蚀疲劳行为和哄骗效果的预应变依赖性清楚地表明，不同的机制已经运作低于和高于约15%的预应变。讨论了可能的机制，如加工硬化和应变诱发马氏体相变。
The fatigue behaviour of prestrained type 316 austenitic stainless steel has been studied. Two types of fatigue tests, conventional S-N tests in laboratory air and in 3%NaCl solution and stress-incremental tests, were performed. Tensile prestrains evaluated are 5%, 15%, 25% and 58%. In laboratory air, fatigue strength increased with increasing prestrain, which was attributed to both work hardening and strain-induced martensitic transformation. In 3%NaCl solution, the fatigue strengths for all specimens decreased compared with those in laboratory air and fatigue strength increased with increasing prestrain up to 15%, but above that prestrain, it decreased significantly. Corrosion pit generation and growth in transformed martensite phase were believed to be primarily responsible for the observed behaviour. Based on stress-incremental test results, the coaxing effect became less pronounced with increasing prestrain, disappeared at 15% and then again appeared at the larger prestrains of 25% and 58%. The observed prestrain dependence in corrosion fatigue behaviour and coaxing effect clearly indicated that different mechanisms had operated below and above the prestrain of approximately 15%. Possible mechanisms such as work hardening and strain-induced martensitic transformation were discussed.