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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Crack Growth Behavior of a New Type of 10% Cr Martensitic Steel Welded Joints with Ni-Based Weld Metal
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Fatigue Crack Growth Behavior of a New Type of 10% Cr Martensitic Steel Welded Joints with Ni-Based Weld Metal

机译：一种新型10％CR马氏体钢焊接接头的疲劳裂纹生长行为，具有Ni的焊缝金属

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摘要

In the present work, the fatigue crack growth (FCG) behavior of a new type of 10% Cr martensitic steel welded joints with Ni-based weld metal was comparatively studied for different regions including base metal (BM), heat-affected zone (HAZ) and weld metal (WM). FCG results indicated that the tempered lath martensite BM has a higher fatigue crack growth resistance than the tempered granular martensite HAZ that without a typical lath structure. In comparison, the austenitic WM has the highest fatigue crack growth threshold. Meanwhile, due to the microstructural and chemical compositional differences between BM and WM, a clear interface existed in the welded joints. At the region of the interface, the microstructures were physically connected and an element transition layer was formed. Although the starter notch was positioned at the region of interface, the fatigue crack gradually deviated from the interface and ultimately propagated along the inter-critically heat-affected zone. The difference in microstructure is considered as the primary factor that resulted in the different fatigue crack growth behaviors of the welded joints. In addition, the continuous microstructure connection and composition transition at the interface contributed to the good fatigue resistance at this region.
机译：在目前的工作中，对于具有Ni的焊接金属的新型10％CR马氏体钢焊接接头的疲劳裂纹生长（FCG）行为对于包括贱金属（BM），热影响区域（HAZ ）和焊接金属（WM）。 FCG结果表明，钢化板状马氏体BM具有比没有典型的板条结构的疲劳颗粒马氏体HAL更高的疲劳裂纹裂纹抗性。相比之下，奥氏体WM具有最高的疲劳裂纹生长阈值。同时，由于BM和WM之间的微观结构和化学成分差异，焊接接头中存在清晰的界面。在界面的区域处，微结构在物理上连接并且形成元件过渡层。尽管起动器凹口位于界面区域，但疲劳裂缝逐渐偏离界面并最终沿着批判性的热影响区域传播。微观结构的差异被认为是导致焊接接头的不同疲劳裂纹生长行为的主要因素。此外，在界面处的连续微观结构连接和组成转变有助于该区域的良好疲劳性。

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