Optimization of process parameters for selective laser melting of Cu-Cr-Nb alloy
REN Yake1, LIU Zuming1, ZHANG Yazhou1, AI Yongkang1, YE Shupeng1, LI Jian1, PENG Weicai2
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Changsha Mitr Instrument Equipment Co., Ltd., Changsha 410219, China
Abstract:Cu-1.93Cr-0.74Nb (mole fraction, %) alloy was prepared by selective laser melting (SLM) using Ar-gas atomized powders. The effects of laser power, scanning speed and scanning spacing on the relative density, molten pool morphology, and microstructure of as-built samples were investigated. The results show that the effects of SLM process parameters on the relative density, metallurgical defects and microstructure of as-built Cu-1.93Cr-0.74Nb alloy are nonlinear. The relative density of as-built sample increases first and then decreases with increasing the laser power from 300 W to 400 W, or the scanning speed from 500 mm/s to 1 100 mm/s. The number and size of pore also shows a similar change rule. The relative density is closely related to the continuity of melting pool, the number and size of pore. The relative density of as-built Cu-1.93Cr-0.74Nb alloy prepared by optimum parameters of the laser power of 330 W, the scanning speed of 800 mm/s and the scanning space of 0.1 mm, reaches 99.3%. It has a bimodal core-shell structure and a strong {110} texture with a large-sized grain as the center and fine grains distributed on the shell. The texture index and texture strength are 9.319 and 7.812, respectively.
任亚科, 刘祖铭, 张亚洲, 艾永康, 叶书鹏, 李建, 彭伟才. Cu-Cr-Nb合金选区激光熔融工艺参数优化[J]. 粉末冶金材料科学与工程, 2022, 27(1): 66-76.
REN Yake, LIU Zuming, ZHANG Yazhou, AI Yongkang, YE Shupeng, LI Jian, PENG Weicai. Optimization of process parameters for selective laser melting of Cu-Cr-Nb alloy. Materials Science and Engineering of Powder Metallurgy, 2022, 27(1): 66-76.
[1] TENWICK M J, DAVIES H A.Enhanced strength in high conductivity copper alloys[J]. Materials Science and Engineering A, 1988, 98: 543-546. [2] CHOI J H.Aging behavior and precipitate analysis of copper-rich Cu-Fe-Mn-P alloy[J]. Materials Science and Engineering A, 2012, 550:183-190. [3] KIM H G, HAN S Z, EUH K, et al.Effects of C addition and thermo-mechanical treatments on microstructures and properties of Cu-Fe-P alloys[J]. Materials Science and Engineering A, 2011, 530: 652-658. [4] FU H, XU S, LI W, et al.Effect of rolling and aging processes on microstructure and properties of Cu-Cr-Zr alloy[J]. Materials Science and Engineering A, 2017, 700: 107-115. [5] 赵凡, 刘祖铭, 吕学谦, 等. 粉末冶金Cu-Cr-Zr合金的形变热处理组织及性能[J]. 粉末冶金材料科学与工程, 2019, 24(4): 385-390. ZHAO Fan, LIU Zuming, LÜ Xueqian, et al.Microstructure and properties of powder metallurgical Cu-Cr-Zr alloy by heat-treatment and deformation[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 385-390. [6] LEI Q, LI Z, DAI C, et al.Effect of aluminum on microstructure and property of Cu-Ni-Si alloys[J]. Materials Science and Engineering A, 2013, 572: 65-74. [7] WANG W, KANG H, CHEN Z, et al.Effects of Cr and Zr additions on microstructure and properties of Cu-Ni-Si alloys[J]. Materials Science and Engineering A, 2016, 673: 378-390. [8] JANOVSZKY D, TOMOLYA K, SVEDA M, et al.Effect of Y and Ni addition on liquid immiscibility in Cu-Zr-Ag ternary alloys[J]. Journal of Alloys and Compounds, 2014, 615: S616-S620. [9] LI H, JIE J, CHEN H, et al.Effect of rotating magnetic field on the microstructure and properties of Cu-Ag-Zr alloy[J]. Materials Science and Engineering A, 2015, 624: 140-147. [10] DEGROH H C, ELLIS D L, LOEWENTHAL W S.Comparison of grcop-84 to other Cu alloys with high thermal conductivities[J]. Journal of Materials Engineering and Performance, 2007, 17(4): 594-606. [11] SHUKLA A K, SHARMA V M J, MURTY S V S N, et al. Integrity of structural and thermo-structural materials for indian space programme[J]. Procedia Engineering, 2014, 86: 8-17. [12] DENG H, YI J, XIA C, et al.Mechanical properties and microstructure characterization of well-dispersed carbon nanotubes reinforced copper matrix composites[J]. Journal of Alloys and Compounds, 2017, 727: 260-268. [13] REN S, CHEN J, HE X, et al.Effect of matrix-alloying-element chromium on the microstructure and properties of graphite flakes/copper composites fabricated by hot pressing sintering[J]. Carbon, 2018, 127: 412-423. [14] 彭刚, 蔡晓兰, 周蕾, 等. 粉末冶金CNTs/Cu复合材料的显微组织与力学性能[J]. 粉末冶金材料科学与工程, 2016, 21(1): 129-136. PENG Gang, CAI Xiaolan, ZHOU Lei, et al.Microstructure and mechanical properties of CNTs/Cu composites fabricated by powder metallurgy[J]. Materials Science and Engineering of Powder Metallurgy, 2016, 21(1): 129-136. [15] SHUKLA A K, NARAYANA MURTY S V S, SHARMA S C, et al. The serrated flow and recrystallization in dispersion hardened Cu-Cr-Nb alloy during hot deformation[J]. Materials Science and Engineering A, 2016, 673: 135-140. [16] ELLIS D L, CARTER J L W, FERRY M H. A statistical study of the effects of processing upon the creep properties of GRCop-84[J]. Materials Science and Engineering A, 2015, 640: 1-15. [17] DHOKEY N B, SARVE S N, LAMSOGE H A.Development of in-situ synthesis of Cr2Nb reinforced copper alloy by aluminothermic process[J]. Transactions of the Indian Institute of Metals, 2011, 64(4/5): 425-429. [18] DHOKEY N B, SARVE S N, LAMSOGE H A.In-situ Synthesis of Cr2Nb reinforced copper alloy by liquid metallurgy route[J]. Materials Science Forum, 2012, 710: 143-148. [19] SHUKLA A K, NARAYANA MURTY S V S, SURESH KUMAR R, et al. Effect of powder milling on mechanical properties of hot-pressed and hot-rolled Cu-Cr-Nb alloy[J]. Journal of Alloys and Compounds, 2013, 580: 427-434. [20] SHUKLA A K, NARAYANA MURTY S V S, SURESH KUMAR R, et al. Densification behavior and mechanical properties of Cu-Cr-Nb alloy powders[J]. Materials Science and Engineering A, 2012, 551: 241-248. [21] SHUKLA A K, SAMUEL M G, SURESH KUMAR R, et al.Effect of powder oxidation on densification and properties of vacuum hot pressed Cu-Cr-Nb alloy[J]. Materials Science and Engineering A, 2013, 561: 452-459. [22] LÜ X Q, LIU Z M, LEI T, et al.Effect of heat treatment on Cr2Nb phase and properties of spark plasma sintered Cu-2Cr-1Nb alloy[J]. Materials, 2020, 13(12): 2860. [23] 田杰, 黄正华, 戚文军, 等. 金属选区激光熔化的研究现状[J]. 材料导报, 2017, 31(29): 90-101. TIAN Jie, HUANG Zhenghua, QI Wenjun, et al.Research progress on selective laser melting of metal[J]. Materials Reports, 2017, 31(29): 90-101. [24] ZHANG S, ZHU H, ZHANG L, et al.Microstructure and properties of high strength and high conductivity Cu-Cr alloy components fabricated by high power selective laser melting[J]. Materials Letters, 2018, 237: 306-309. [25] SCUDINO S, UNTERDöRFER C, PRASHANTH K G, et al. Additive manufacturing of Cu-10Sn bronze[J]. Materials Letters, 2015, 156: 202-204. [26] JADHAV S D, DHEKNE P P, BRODU E, et al.Laser powder bed fusion additive manufacturing of highly conductive parts made of optically absorptive carburized CuCr1 powder[J]. Materials & Design, 2021, 198: 109369. [27] IKESHOJI T-T, NAKAMURA K, YONEHARA M, et al.Selective laser melting of pure copper[J]. Journal of Metals, 2018, 70(3): 396-400. [28] UCHIDA S, KIMURA T, NAKAMOTO T, et al.Microstructures and electrical and mechanical properties of Cu-Cr alloys fabricated by selective laser melting[J]. Materials & Design, 2019, 175: 107815. [29] MA Z, ZHANG K, REN Z, et al.Selective laser melting of Cu-Cr-Zr copper alloy: parameter optimization, microstructure and mechanical properties[J]. Journal of Alloys and Compounds, 2020, 828: 154350. [30] DINDA G P, DASGUPTA A K, MAZUMDER J.Texture control during laser deposition of nickel-based superalloy[J]. Scripta Materialia, 2012, 67(5): 503-506. [31] BAHL S, MISHRA S, YAZAR K U, et al.Non-equilibrium microstructure, crystallographic texture and morphological texture synergistically result in unusual mechanical properties of 3D printed 316L stainless steel[J]. Additive Manufacturing, 2019, 28: 65-77.