热等静压对激光选区熔化成形GH4169合金组织与高温性能的影响
Effect of hot isostatic pressing on microstructure and high temperature properties of GH4169 alloy formed by selective laser melting
查看参考文献23篇
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文摘
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GH4169合金通常于高温环境下服役,增材制造的GH4169合金高温性能往往低于锻件标准,影响其服役安全性,有必要通过热处理手段提高其安全性。采用激光选区熔化技术(SLM)制备GH4169合金,利用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线能谱分析(EDS)等表征手段,探究热等静压热处理工艺对SLM成形GH4169合金微观组织、高温拉伸性能和高温持久性能的影响。结果表明:与常规热处理工艺相比,经过热等静压处理后的GH4169合金晶粒为等轴晶,气孔基本消失,Laves相基本消失,短棒状δ相在晶界处更加连续,颗粒状 γ''相在晶粒内部大量析出,晶粒得到明显细化。热等静压处理后GH4169合金在扫描方向与沉积方向上的650 ℃抗拉强度分别为1053 MPa和1051 MPa,断后伸长率分别为8.6%和8.5%;高温持久时间分别为1620 min和2065 min,高温持久时间分别提升了90倍和30倍。高温抗拉强度和高温持久时间均高于锻件的性能指标,断后伸长率尚未超过锻件标准。 |
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其他语种文摘
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GH4169 alloy usually serves in high temperature environment,and the high temperature performance of GH4169 alloy made by additive material is often lower than that of the standard of forgings,which affects its service safety,thus it is necessary to improve its safety by means of heat treatment. In this work,GH4169 alloy was prepared by selective laser melting(SLM),and the effects of hot isostatic heat treatment process on the microstructure,high temperature tensile properties and high temperature stress rupture properties of the SLM formed GH4169 alloy were investigated by using characterization methods such as optical microscopy(OM), scanning electron microscopy(SEM) and X-ray energy dispersive spectrometry(EDS), etc. The results show that,compared with the conventional heat treatment processes,the grains of GH4169 alloy after hot isostatic treatment are equiaxed, the pores and Laves phases are basically disappeared,the short rod-like δ phase is more continuous at the grain boundaries,a large number of granular γ'' phases are precipitated inside the grains,and the grains are significantly refined. After hot isostatic pressing treatment,the ultimate tensile strengths of GH4169 alloy at 650 ℃ are 1053 MPa and 1051 MPa,the elongations after breaking are 8.6% and 8.5%,the high temperature stress rupture properties are 1620 min and 2065 min,and the high temperature endurance time is improved by 90 times and 30 times respectively in scanning and building direction. The high temperature ultimate tensile strength and high temperature stress rupture properties are higher than wrought standard,while the elongation after breaking has not exceeded the wrought standard. |
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来源
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航空材料学报
,2024,44(1):84-92 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2023.000153
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关键词
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激光选区熔化成形
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GH4169
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热等静压
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组织演变
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高温性能
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地址
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1.
中国航发北京航空材料研究院焊接与塑性成形研究所, 北京, 100095
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航发优材(镇江)增材制造有限公司技术部, 江苏, 镇江, 212132
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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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1005-5053 |
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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:7676466
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