热等静压/热处理工艺对激光选区熔化成形GH4169合金微观组织与拉伸性能的影响

doi:10.11868/j.issn.1001-4381.2019.000416

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摘要

采用激光选区熔化（SLM）成形技术制备GH4169合金，利用金相显微镜（OM）、扫描电子显微镜（SEM）、电子背散射衍射（EBSD）和透射电镜（TEM）等分析热等静压/热处理工艺对SLM成形GH4169合金微观组织及拉伸性能的影响规律。结果表明：沉积态合金组织中，沿沉积方向的晶粒为柱状晶，晶粒内枝晶组织细小，枝晶间分布大量Laves相；经热等静压后，合金中的气孔及Laves相可被有效消除，沿沉积方向的晶粒转变为等轴晶；经980℃/1 h固溶处理后，合金中的晶界处析出大量短棒状δ相。热等静压/热处理后GH4169合金试样的室温及650℃拉伸性能均高于锻件标准要求的力学性能指标，且温度对断裂方式影响不大。

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	石磊
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关键词 ：激光选区熔化成形, GH4169, 热等静压, 组织演变, 拉伸性能

Abstract：

GH4169 alloys were manufactured by selective laser melting (SLM). The microstructure evolution and tensile properties of GH4169 alloys during hot isostatic pressing(HIP) and heat treatment(HT) process were analyzed by OM, SEM, EBSD and TEM. The results show that the grains of the as-deposited samples in the building direction are columnar, exhibit very fine cellular-dendritic structure with fine Laves phases precipitating in the interdendritic region. Most of porosities and Laves phases disappear after HIP, and the microstructure parallel to the building direction is transformed into equiaxed grains. Short rod-like δ phases are precipitated along grain boundaries after annealing at 980 ℃ for 1 h. The tensile properties at room temperature and 650 ℃ of specimens after HIP and HT are higher than those of the standard requirements for the forgings, and the temperature has a little influence on the fracture mode.

Key words： selective laser melting GH4169 hot isostatic pressing microstructure evolution tensile property

收稿日期: 2019-05-07 出版日期: 2020-06-15

中图分类号:

TG146.1⁺5

基金资助:民用飞机专项科研资助项目(MJ-2017-G-63)

通讯作者: 雷力明 E-mail: biamfirst@126.com

作者简介: 雷力明(1976-), 男, 研究员, 博士, 主要从事航空发动机材料及关键零部件制造技术研发工作, 联系地址:上海市闵行区莲花南路3998号中国航发商发设计研发中心(200241), E-mail:biamfirst@126.com

引用本文:

石磊, 雷力明, 王威, 付鑫, 张广平. 热等静压/热处理工艺对激光选区熔化成形GH4169合金微观组织与拉伸性能的影响[J]. 材料工程, 2020, 48(6): 148-155.
Lei SHI, Li-ming LEI, Wei WANG, Xin FU, Guang-ping ZHANG. Effects of hot isostatic pressing and heat treatment process on microstructure and tensile properties of selective laser melting manufactured GH4169 alloy. Journal of Materials Engineering, 2020, 48(6): 148-155.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.000416 或 http://jme.biam.ac.cn/CN/Y2020/V48/I6/148

Table 1 GH4169合金粉末化学成分(质量分数/%)

Table 2 GH4169合金SLM成形工艺参数

Fig.1 扫描路径示意图(a)及拉伸试样示意图(b)

Fig.2 沉积态试样抛光组织(YOZ)

Fig.3 沉积态试样YOZ面(a)与XOY面(b)的金相组织以及平行方向(c)和垂直方向(d)的晶粒EBSD取向

Fig.4 沉积态试样YOZ面的SEM枝晶组织(a)及其放大组织(b)与枝晶间析出相TEM明场像(c)以及析出相TEM明场像及其电子衍射图谱(d)

Fig.5 热等静压/热处理后试样YOZ面抛光态组织(a)以及腐蚀后YOZ(b)和XOY(c)面的金相组织

Fig.6 热等静压/热处理试样YOZ面的SEM组织
(a), (b)HIP处理后样品组织；(c)HIP+HT处理后样品组织；(d)图(b)方框中析出相的EDS能谱

Fig.7 热等静压/热处理试样室温(a)及650 ℃(b)拉伸性能

Fig.8 650 ℃及室温拉伸样品断口SEM形貌
(a), (b)650 ℃断口形貌; (c)650 ℃对应断口的剖切面组织；(d), (e)室温断口形貌; (f)室温对应断口的剖切面组织

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