δ相对激光选区熔化成形GH4169合金持久性能的影响
Effects of δ Phase on Stress Rupture Properties of GH4169 Alloy Manufactured by Selective Laser Melting
摘 要
采用激光选区熔化（SLM）技术制备GH4169合金，通过热等静压+时效与热等静压+固溶+时效2种热处理制度控制δ相的析出，研究δ相对合金持久性能的影响。结果表明：2种工艺热处理后，SLM成形GH4169合金组织均为等轴晶，且存在退火孪晶；经热等静压+固溶+时效处理后，合金晶界处析出大量长棒状与连续颗粒状δ相；经热等静压+固溶+时效处理后合金在650℃/690 MPa下的持久寿命是热等静压+时效处理后的一半左右，δ相的析出是导致合金持久寿命较低的主要原因；2种工艺处理的SLM成形合金的持久寿命均显著超过锻件的标准要求，且持久断裂方式均为沿晶断裂。
GH4169合金
δ相
持久性能
selective laser melting
GH4169 alloy
δ phase
stress rupture property
Abstract
GH4169 alloy was prepared by selective laser melting (SLM) technique, and the heat treatments of hot isostatic pressing+aging and hot isostatic pressing+solution+aging were applied to control the precipitation of δ phase. The effect of δ phase on stress rupture properties of the alloy was investigated. The results show that the microstructure of SLM forming GH4169 alloy consisted of equiaxed grains and annealing twins after two heat treatments. A large number of rod-like and continuous granular δ phases precipitated at grain boundaries of the alloy after hot isostatic pressing+solution+aging treatment. The stress rupture life at 650 ℃/690 MPa of the alloy heat-treated by hot isostatic pressing+solution+aging was about half of that of the alloy heat-treated by hot isostatic pressing+aging, the precipitation of δ phase was the main reason for the lower stress rupture life of the alloy. The stress rupture lives of alloys after two heat treatments highly exceeded the standard requirements of the forging, and the fracture feature was intergranular fracture.
中图分类号 TG132.3 DOI 10.11973/jxgccl202007011
所属栏目 材料性能及应用
基金项目 民用飞机专项科研资助项目（MJ-2017-G-63）
收稿日期 2020/3/22
修改稿日期 2020/6/12
网络出版日期
作者单位点击查看
备注石磊(1990—),男,山东淄博人,工程师,博士
引用该论文: SHI Lei,LEI Liming,WANG Wei,FU Xin. Effects of δ Phase on Stress Rupture Properties of GH4169 Alloy Manufactured by Selective Laser Melting[J]. Materials for mechancial engineering, 2020, 44(7): 51～56
石磊,雷力明,王威,付鑫. δ相对激光选区熔化成形GH4169合金持久性能的影响[J]. 机械工程材料, 2020, 44(7): 51～56
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【2】HENDERSON M B,ARRELL D,LARSSON R,et al.Nickel based superalloy welding practices for industrial gas turbine applications[J].Science and Technology of Welding and Joining, 2004,9(1):13-21.
【3】LI X,SHI J J,WANG C H,et al.Effect of heat treatment on microstructure evolution of Inconel 718 alloy fabricated by selective laser melting[J].Journal of Alloys and Compounds, 2018,764:639-649.
【4】TILLMANN W,SCHAAK C,NELLESEN J,et al.Hot isostatic pressing of IN718 components manufactured by selective laser melting[J].Additive Manufacturing,2017,13:93-102.
【5】DENG D Y,PENG R L,BRODIN H,et al.Microstructure and mechanical properties of Inconel 718 produced by selective laser melting:Sample orientation dependence and effects of post heat treatments[J].Materials Science and Engineering:A, 2018,713:294-306.
【6】KUO Y L,HORIKAWA S,KAKEHI K.Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing[J].Scripta Materialia, 2017,129:74-78.
【7】XU Z,MURRAY J W,HYDE C J,et al.Effect of post processing on the creep performance of laser powder bed fused Inconel 718[J].Additive Manufacturing, 2018,24:486-497.
【8】PRÖBSTLE M,NEUMEIER S,HOPFENMVLLER J,et al.Superior creep strength of a nickel-based superalloy produced by selective laser melting[J].Materials Science and Engineering:A, 2016,674:299-307.
【9】LI S,YANG J,ZHUANG J,et al.The effect of delta-phase on crack propagation under creep and fatigue conditions in alloy 718[C]//Superalloys 718,625,706 and Various Derivatives. Warrendale: TMS, 1994: 545-555.
【10】ZHANG H J,LI C,GUO Q Y,et al.Hot tensile behavior of cold-rolled Inconel 718 alloy at 650℃:The role of δ phase[J].Materials Science and Engineering:A,2018,722:136-146.
【11】韩志宇,曾光,梁书锦,等. 镍基高温合金粉末制备技术的发展现状[J]. 中国材料进展,2014, 33(12):748-755.
【12】TAN J H,WONG W L E,DALGARNO K W.An overview of powder granulometry on feedstock and part performance in the selective laser melting process[J].Additive Manufacturing, 2017,18:228-255.
【13】HEBERT R J.Viewpoint:Metallurgical aspects of powder bed metal additive manufacturing[J].Journal of Materials Science, 2016,51(3):1165-1175.
【14】石磊,雷力明,王威,等. 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.
【15】张善勇,隋玉俭. 铸造高温合金的热等静压致密化机理[J]. 钢铁研究学报, 1985, 5(增刊1):77-83.
【16】KOPEZKY C,NOVIKOV V,FIONOVA L,et al.Investigation of annealing twins in F.C.C.metals[J].Acta Metallurgica, 1985,33(5):873-879.
【17】杨钢,孙利军,张丽娜,等.形变孪晶的消失与退火孪晶的形成机制[J].钢铁研究学报,2009,21(2):39-43.
【18】刘奋成. 激光立体成形GH4169合金的组织和强化机理[D]. 西安:西北工业大学,2011: 40-42.
【19】AZADIAN S,WEI L Y,WARREN R.Delta phase precipitation in Inconel 718[J].Materials Characterization, 2004,53(1):7-16.
【20】DONACHIE M J,DONACHIE S J.Superalloys[M]. OH: ASM International, 2002: 105-110.
【21】李晨,李淼泉,王柯. 固溶处理GH4169合金的高温变形行为[J]. 航空学报,2010, 31(2): 368-373.
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