Development of the control technique for damage formation of advanced heat resistant material based on the EBSD analysis

先进耐磨材料在蠕变-疲劳交互作用条件下的高温损伤，如马氏体板条组织所表现的那样，在蠕变-疲劳交互作用条件下的影响尚不清楚。本研究通过蠕变-疲劳裂纹扩展试验，并在金相组织分析的基础上，利用EBSD技术对损伤进行了定量分析，以了解蠕变和疲劳对损伤形成和裂纹扩展特性的交互作用。结果表明，蠕变效应促进了损伤区域的扩展，疲劳效应增加了损伤程度。这些结果将促进材料结构控制技术的发展，使我们能够准确地预测裂纹扩展寿命。

High temperature damage for advanced hear-resistant materials under creep-fatigue interactive condition affected by strengthening microstructure, such as that exhibited by the martensitic lath structure, has not yet been clarified. In the present study, the experiments of creep-fatigue crack growth tests and the quantitative analysis of damage on the basis of metallographical investigation using EBSD technique were conducted to understand the interactive effects of creep and fatigue on the characteristics of damage formation and crack growth. As a result, creep effect contributed to the expansion of damage region and fatigue effect increased the degree of damage. These results will promote the development of the control technique for material structure that will enable us to accurately predict crack growth life.