| 温度对核电用GH690合金力学行为的影响 |
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| 引用本文： | 王磊,王富强,刘杨. 温度对核电用GH690合金力学行为的影响[J]. 中国材料进展, 2011, 30(5) |
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| 作者姓名： | 王磊 王富强 刘杨 |
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| 作者单位： | 东北大学材料各向异性与织构教育部重点实验室,辽宁,沈阳,110819 |
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| 基金项目： | 科技部973计划项目，长江学者创新团队项目 |
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| 摘 要： | 以国产蒸汽发生器传热管用GH690合金为研究对象,通过评价其断裂韧性及拉伸特性,结合光学显微镜、扫描电镜和透射电镜分析,研究了合金由室温-623K的力学性能.研究结果表明,室温下GH690合金低的层错能,易生成形变孪晶,使得合金在孪生的协调下塑性变形能力提高,同时孪晶促进裂纹扩展转向,使合金在断裂过程中吸收更多的能量,维持合金高的断裂韧性.随着温度的升高,合金的层错能增加,导致形变孪晶生成困难,合金应力集中程度加剧,裂纹从而平直扩展,合金的断裂韧性降低.由于合金的室温层错能较低,合金在拉伸时能够通过孪生协调变形,同时生成的孪晶阻碍了位错的滑移而提高了合金的强度和塑性.随着形变温度的升高,合金通过孪生协调变形的能力降低,导至合金的变形机制由孪生转变为滑移,滑移产生的加工硬化效应小于孪生,故合金的强度和延伸率随之降低.
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| 关 键 词： | GH690合金 温度 断裂韧性 拉伸变形 |
Effect of Temperature on Mechanical Behavior of GH690 Alloy for Nuclear Plant |
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| WANG Lei,WANG Fuqiang,LIU Yang. Effect of Temperature on Mechanical Behavior of GH690 Alloy for Nuclear Plant[J]. Rare Metals Letters, 2011, 30(5) |
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| Authors: | WANG Lei WANG Fuqiang LIU Yang |
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| Affiliation: | WANG Lei,WANG Fuqiang,LIU Yang (Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China) |
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| Abstract: | GH690 alloy made in China was employed as the testing material in the present research.The mechanical behaviors of GH690 alloy were investigated with both fracture toughness testing and tensile testing from RT to 623 K,combined with the analysis of optical microscopy(OM),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results indicate that the lower stacking fault energy of GH690 alloy at room temperature easily leads forming of deforming twins,thus resulting in higher plasti... |
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| Keywords: | GH690 alloy temperature fracture toughness tensile deformation |
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