Abstract Tension and fracture toughness JIc tests were performed on both as-welded and heat-treated conditions. The softer tempered martensitic matrix and the transformation-induced plasticity (TRIP) of reformed austenite improved significantly the strain hardening behavior of the heat-treated material. These matrix characteristics were found to retard micro-void nucleation during straining. The onset of necking, the elongation at fracture, and the fracture toughness JIc were improved by 55%, 28% and 90%, respectively. These results provide an opportunity to document how the matrix mechanical properties influence the fracture behavior of material which rupture is controlled by the nucleation of micro-voids.

中文翻译：

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低温临界间热处理对 13% Cr-4% Ni 马氏体不锈钢多道焊件稳定裂纹扩展行为的影响

摘要 拉伸和断裂韧性 Jic 试验在焊态和热处理条件下进行。较软的回火马氏体基体和重整奥氏体的相变诱导塑性 (TRIP) 显着改善了热处理材料的应变硬化行为。发现这些基体特性会在应变过程中延迟微空隙成核。颈缩开始、断裂伸长率和断裂韧性 JIc 分别提高了 55%、28% 和 90%。这些结果为记录基体机械性能如何影响材料的断裂行为提供了机会，材料的断裂由微孔的成核控制。