镍基单晶高温合金晶相ⅰ阶段裂纹的晶体塑性评价

M. Sakaguchi, Ryota Komamura, Mana Higaki, Xiaosheng Chen, H. Inoue
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引用次数: 0

摘要

对ni基单晶高温合金NKH-304的I期疲劳裂纹沿滑移面扩展进行了实验和分析研究。采用不同主、次取向组合的4种C(T)试样进行了室温疲劳裂纹扩展试验。实验结果表明,疲劳裂纹沿滑移面沿I型、II型和III型构件的混合模式扩展。一次晶向和二次晶向对混合比和疲劳裂纹扩展速率有较大影响。为了解释晶体取向对第一阶段裂纹的影响,考虑了晶体裂纹面的实际几何形状,进行了晶体塑性有限元分析。各八面体滑移体系的滑移活动分析结果和基于临界面方法的损伤参数,合理解释了晶体取向对晶体ⅰ阶段裂纹路径和扩展速率的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Crystal Plasticity Assessment to Crystallographic Stage I Cracking in a Ni-Based Single Crystal Superalloy
Stage I fatigue crack propagation along crystallographic slip planes was experimentally and analytically investigated in a single crystal Ni-base superalloy, NKH-304. Fatigue crack propagation tests at room temperature were conducted using four types C(T) specimens with different combinations of primary and secondary orientations. It was revealed in the experiments that the fatigue cracks propagated along crystallographic slip plane in mixed mode with Mode I, II and III components. Mixture ratio and fatigue crack propagation rate was strongly influenced by the primary and secondary crystal orientations. In order to interpret the effect of crystal orientations on the Stage I cracking, a crystal plasticity finite element analysis was conducted considering the actual geometry of the crystallographic crack planes. Analytical results for slip activities on the individual octahedral slip systems and a damage parameter based on the critical plane approach provided reasonable explanations to the effect of crystal orientations on the cracking path and propagation rate of the crystallographic Stage I cracking.
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