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OALib Journal期刊
ISSN: 2333-9721
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不同温度下gh690合金断裂韧性及断裂行为
Keywords: 金属材料,gh690合金,断裂韧性,形变孪晶,层错能
Abstract:
？选取三点弯曲试样、采用$j$积分方法评价了gh690合金从室温到623k的断裂韧性,考察了不同温度下合金的断裂行为。结果表明,gh690合金的断裂韧性随着温度的升高而降低。由于室温层错能较低,合金变形可以通过孪生协调进行,而形变孪晶诱导裂纹扩展转向,延长了裂纹的扩展路径,使合金表现为较高的断裂韧性;随着温度的升高,合金的层错能增加,形变孪晶生成的机率降低,裂纹扩展转向减少,导致合金的断裂韧性随之降低。
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