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OALib Journal期刊
ISSN: 2333-9721
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沉淀强化奥氏体合金的氢致断裂行为
Keywords: 金属材料,沉淀强化奥氏体合金,沿晶断裂,滑移带开裂,氢致局部塑性变形
Abstract:
？研究了未充氢和热充氢沉淀强化奥氏体合金的拉伸断裂行为,分析了其氢脆敏感性与拉伸断裂行为间的联系,研究了氢对合金局部塑性变形及微裂纹形核的影响。结果表明：氢使沉淀强化合金由单一的韧窝断裂转变为韧窝断裂、沿晶断裂和滑移带开裂的混合断裂方式。其原因是：一方面,氢促进位错平面化滑移趋势、加剧局部塑性变形;另一方面,滑移带被晶界、孪晶界以及不同取向的滑移带所阻碍,引起了位错塞积和氢聚集。
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