Microstructure and Tensile Properties of Hastelloy-X Alloy Prepared by Selective Laser Melting
摘 要
采用激光选区熔化技术制备了Hastelloy-X合金(沉积态),并依次进行了热等静压和热处理,研究了不同处理后合金的显微组织和室温拉伸性能。结果表明:当线能量为98 J·m-1时,沉积态Hastelloy-X合金组织中存在气孔、未熔粉等缺陷和熔池界、枝晶等亚结构,随着线能量的增大,合金的相对密度提高,缺陷数量减少;经热等静压处理后,组织由等轴晶和网状碳化物组成,经热等静压+热处理后,部分网状碳化物溶解并呈弥散分布,晶内析出细小的第二相;沉积态合金的断裂方式为脆性断裂,经热等静压处理后,合金的塑性提高,断口呈二次裂纹+韧窝的混合型形貌,经热等静压+热处理后,合金的塑性进一步提高,室温拉伸性能优于锻件的标准指标,断口呈以破裂碳化物为韧窝中心的韧性断裂形貌。
Abstract
Hastelloy-X alloy (as-diposited state) was prepared by selective laser melting, and was treated by thermal isostatic pressure and heat treatments in sequence. The microstructure and tensile properties at room temperature of the alloy after different treatment were investigated. The results show that defects of pores and un-melting powder and sub-structures of melting pool boundaries and dendrites were formed in as-deposited Hastelloy-X alloy at linear energy of 98 J·m-1; with the increase of linear energy, the relative density of the alloy increased and defects amount decreased. After thermal isostatic pressure treatment, the microstructure consisted of equiaxial grains and network carbides. After thermal isostatic pressure and heat treatment, a part of network carbides dissolved and distributed evenly, and the fine second phases precipitated in grains. The fracture mode of as-deposited alloy was brittle fracture. After thermal isostatic pressure treatment, the plasticity of the alloy was improved and the fracture presented a mixed morphology with secondary cracks and dimples. After thermal isostatic pressure and heat treatment, the plasticity was further improved, the room-temperature tensile properties was better than the standard index of forging parts, and the fracture presented the ductile fracture morphology with the dimple center of fractured carbides.
中图分类号 TG146.1 DOI 10.11973/jxgccl201807004
所属栏目 试验研究
基金项目 上海电气集团股份有限公司科研项目(SE16-J39)
收稿日期 2017/6/2
修改稿日期 2018/6/12
网络出版日期
作者单位点击查看
备注廖文俊(1980-),男,浙江金华人,高级工程师,博士
引用该论文: LIAO Wenjun,FAN Enxiang,FU Chao. Microstructure and Tensile Properties of Hastelloy-X Alloy Prepared by Selective Laser Melting[J]. Materials for mechancial engineering, 2018, 42(7): 16~22
廖文俊,樊恩想,付超. 激光选区熔化Hastelloy-X合金的显微组织与拉伸性能[J]. 机械工程材料, 2018, 42(7): 16~22
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参考文献
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【3】JIA Q B, GU D D. Selective laser melting additive manufacturing of Inconel 718 superalloy parts:Densification, microstructure and properties[J]. Journal of Alloys and Compounds, 2014, 585(17):713-721.
【4】WANG F D. Mechanical property study on rapid additive layer manufacture Hastelloy© X alloy by selective laser melting technology[J]. International Journal of Advanced Manufacturing Technology, 2012, 58(5/6/7/8):545-551.
【5】WANG F, WU X H, CLARK D. On direct laser deposited Hastelloy X:Dimension, surface finish, microstructure and mechanical properties[J]. Materials Science and Technology, 2011, 27(1):344-356.
【6】TIAN Y, TOMUS D, ROMETSCH P, et al. Influences of processing parameters on surface roughness of Hastelloy X produced by selective laser melting[J]. Additive Manufacturing, 2017, 13:103-112.
【7】ETTER T, KUNZE K, GEIGER F, et al. Reduction in mechanical anisotropy through high temperature heat treatment of Hastelloy X processed by selective laser melting (SLM)[C]//IOP Conference Series:Materials Science and Engineering. Bristol:IOP Publishing, 2015.
【8】侯慧鹏,梁永朝,何艳丽,等.选区激光熔化Hastelloy-X合金组织演变及拉伸性能研究[J]. 中国激光,2017,44(2):0202007.
【9】TOMUS D, JARVIS T, WU X, et al. Controlling the microstructure of Hastelloy-X components manufactured by selective laser melting[J]. Physics Procedia, 2013, 41:823-827.
【10】HARRISONN J, TODD I, MUMTAZ K. Reduction of micro-cracking in nickel superalloys processed by selective laser melting:A fundamental alloy design approach[J]. Acta Materialia, 2015, 94:59-68.
【11】TOMUS D, TIAN Y, ROMETSCH P A, et al. Influence of post heat treatments on anisotropy of mechanical behaviour and microstructure of Hastelloy-X parts produced by selective laser melting[J]. Materials Science & Engineering:A, 2016, 667:42-53.
【12】刘奋成. 激光立体成形GH4169合金的组织和强化机理研究[D]. 西安:西北工业大学,2011:38-39.
【13】黄卫东,林鑫,陈静,等. 激光立体成形[M]. 西安:西北工业大学出版社,2007:126-136.
【14】ZHAO X, CHEN J, LIN X, et al. Study on microstructure and mechanical properties of laser rapid forming Inconel 718[J]. Materials Science & Engineering:A, 2008, 478(1/2):119-124.
【15】ZHAO J C, LARSEN M, RAVIKUMAR V. Phase precipitation and time-temperature-transformation diagram of Hastelloy X[J]. Materials Science & Engineering:A, 2000, 293(1/2):112-119.
【16】BELAN J. GCP and TCP phases presented in nickel-base superalloys[J]. Materials Today:Proceedings, 2016, 3(4):936-941.
【17】刘智恩. 材料科学基础[M]. 西安:西北工业大学出版社,2000:142-143.
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