长期时效对DD6单晶高温合金组织和力学性能的影响
Effect of long term aging on microstructure and mechanical properties of DD6 single crystal superalloy
查看参考文献18篇
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文摘
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采用螺旋选晶法制备DD6合金单晶试棒,标准热处理后在980℃长期时效2000h,研究980℃长期时效对DD6单晶高温合金的组织演化及力学性能的影响。结果表明:随着长期时效时间的延长,合金中γ'相的尺寸增大,2000h后γ'相尺寸约为1μm,没有TCP相析出,合金具有较好的组织稳定性。2000h长期时效试样在980℃/243MPa下持久寿命为180.16h,为热处理态的56.3%;在1070℃/130MPa下持久寿命为144.42h,为热处理态的35.31%,断裂模式均为微孔聚集型断裂;相比热处理态的合金,2000h长期时效态试样760℃的抗拉强度和屈服强度分别降低5.55%和5.88%;980℃的抗拉强度和屈服强度分别下降11%和10.59%。 |
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其他语种文摘
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DD6 single crystal superalloy specimens were prepared by spiral crystal selection method.After standard heat treatment the long term aging at 980℃ was performed for 2000h.The influences of the microstructural evolution and mechanical properties of DD6 single crystal superalloy after long term aging at 980℃ were studied.The results show that with the prolongation of long term aging time,the size ofγ'phase in the alloy increases.After long term aging for 2000h,the size of γ' phase is about 1μm,and there is no TCP phase precipitation,which shows that DD6 alloy has good microstructural stability.The stress rupture life of sample after long term aging for 2000h is 180.16h at 980 ℃/243 MPa,which is 56.3% of heat treated state,and 144.42h at 1070 ℃/130MPa,which is 35.31%of heat treated state.The fracture mode is microvoid coalescence fracture.The tensile strength and yield strength of the alloy after long term aging for 2000h are reduced by 5.55%and 5.88%at 760℃,and 11%and 10.59%at 980℃,respectively. |
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来源
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材料工程
,2021,49(6):94-99 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2020.001125
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关键词
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DD6单晶高温合金
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长期时效
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持久性能
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拉伸性能
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地址
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中国航发北京航空材料研究院, 先进高温结构材料国防科技重点实验室, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:6997249
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