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首页> 外文会议>International Conference on Proceeding amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Application of Local Approach to Hydrogen Embrittlement Fracture Evaluation of High Strength Steels
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Application of Local Approach to Hydrogen Embrittlement Fracture Evaluation of High Strength Steels

机译：局部方法在高强度钢氢脆断裂评价中的应用

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摘要

A new method for evaluating the hydrogen embrittlement (HE) susceptibility of ultra high strength steel was studied in order to propose a new method for assessing the delayed fracture property. The material used was 1400MPa tempered martensitic steel with the chemical composition 0.40C-0.24Si-0.81 Mn-1.03Cr-0.16Mo(mass%). The local approach originally used for evaluating the brittle fracture property was applied to HE susceptibility assessment after modifying the method to include the effect of hydrogen content. Critical HE data used in the modified local approach was obtained by a stepwise test in which alternating processes of stress increase and stress holding were repeated until the specimen fractured. The specimen used in the stepwise test was 10 mm in diameter and the stress concentration factor was 4.9. Assessment of HE susceptibility for specimens with other dimensions entailed the use of a critical hydrogen content for failure, Hc, representing the maximum hydrogen content among the unfractured specimens in the HE test with constant loading. Matters to be noted for obtaining the material parameters are discussed.
机译：为了评估延迟断裂性能，提出了一种新的评价超高强度钢氢脆敏感性的方法。所使用的材料是1400MPa回火马氏体钢，化学成分为0.40C-0.24Si-0.81Mn-1.03Cr-0.16Mo（质量％）。在修改方法以包括氢含量的影响后，将最初用于评估脆性断裂特性的局部方法应用于HE敏感性评估。修改后的局部方法中使用的关键HE数据是通过逐步测试获得的，在该测试中，重复进行应力增加和应力保持的交替过程，直到试样断裂为止。逐步测试中使用的样品直径为10 mm，应力集中系数为4.9。评估其他尺寸试样的HE敏感性需要使用失效的临界氢含量Hc，代表在恒定载荷下HE测试中未破裂试样中的最大氢含量。讨论了获得材料参数要注意的事项。

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