Effect of solution-aging treatment on the microstructure and properties of selective laser melted CoCrWMo alloys
BAN Le1, HUANG Jiahao2, MAO Weidong3, WU Yuanbiao1, XIAO Zhiyu1
1. National Engineering Research of Net-Sharp Forming for Metallic Material, South China University of Technology, Guangzhou 510640, China; 2. Guangzhou Zoltrix HIP Material Co. Ltd, Guangzhou 511458, China; 3. Foshan Nanhai Zhongnan Machinery Co. Ltd, Foshan 528247, China
Abstract The selective laser melted (SLM) CoCrWMo alloys were solution treated at 1 200 ℃ for 1 h, and then aged at 600, 700, 750, 800 and 900 ℃ for 10 h respectively. The effects of solution-aging treatment on the microstructure and properties of the alloy were studied. The results show that the SLM CoCrWMo alloy is composed of FCC γ phase and HCP ε phase martensite. The transformation from γ phase (FCC phase) to ε phase (HCP phase) occurs during solution- aging treatment. The content of ε phase martensite increases with increasing the aging temperature, M23C6(M=Cr,Mo,W) precipitated at the same time. In the alloy aged at 750 ℃, the proportion of ε phase is 77%, indicating that aging treatment can promote the transformation of FCC→HCP martensite. The microhardness of all aged alloys is significantly higher than that of solid solution alloys. The strength of the alloy aged at 750 ℃ is improved while the elongation is taken into account, the tensile strength and yield strength are 1 076 MPa and 820.8 MPa respectively, and the elongation reaches 10.5%.
BAN Le,HUANG Jiahao,MAO Weidong, et al. Effect of solution-aging treatment on the microstructure and properties of selective laser melted CoCrWMo alloys[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 27-34.
[1] UPADHYAY D, PANCHAL M A, DUBEY R S, et al.Corrosion of alloys used in dentistry: A review[J]. Materials Science and Engineering A, 2006, 432(1/2): 1-11. [2] MISCHLER S, MUNOZ A I.Wear of CoCrMo alloys used in metal-on-metal hip joints: A tribocorrosion appraisal[J]. Wear, 2013, 297(1/2): 1081-1094. [3] WATAHA J C.Alloys for prosthodontic restorations[J]. The Journal of Prosthetic Dentistry, 2002, 87(4): 351-363. [4] LIAO Y, HOFFMAN E, WIMMER M, et al.CoCrMo metal-on- metal hip replacements[J]. Physical Chemistry Chemical Physics, 2013, 15(3): 746-756. [5] LU Y, WU S, GAN Y, et al.Investigation on the microstructure, mechanical property and corrosion behavior of the selective laser melted CoCrW alloy for dental application[J]. Materials Science and Engineering C, 2015, 49: 517-525. [6] KOUTSOUKIS T, ZINELIS S, ELIADES G, et al.Selective laser melting technique of Co-Cr dental alloys: a review of structure and properties and comparative analysis with other available techniques[J]. Journal of Prosthodontics, 2015, 24(4): 303-312. [7] QI H B, YAN Y N, LIN F, et al.Direct metal part forming of 316L stainless steel powder by electron beam selective melting[J]. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2006, 220(11): 1845-1853. [8] SCHLEIFENBAUM H, MEINERS W, WISSENBACH K, et al.Individualized production by means of high power Selective Laser Melting[J]. CIRP Journal of Manufacturing Science and Technology, 2010, 2(3): 161-169. [9] ZHANG M, YANG Y, SONG C, et al.An investigation into the aging behavior of CoCrMo alloys fabricated by selective laser melting[J]. Journal of Alloys and Compounds, 2018, 750: 878-886. [10] LU Y, WU S, GAN Y, et al.Microstructure, mechanical property and metal release of As-SLM CoCrW alloy under different solution treatment conditions[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2016, 55: 179-190. [11] KOIZUMI Y, SUZUKI S, YAMANAKA K, et al.Strain-induced martensitic transformation near twin boundaries in a biomedical Co-Cr-Mo alloy with negative stacking fault energy[J]. Acta Materialia, 2013, 61(5): 1648-1661. [12] MORI M, YAMANAKA K, MATSUMOTO H, et al.Evolution of cold-rolled microstructures of biomedical Co-Cr-Mo alloys with and without N doping[J]. Materials Science and Engineering A, 2010, 528(2): 614-621. [13] TURRUBIATES-ESTRADA R, SALINAS-RODRIGUEZ A, LOPEZ H F.FCC to HCP transformation kinetics in a Co-27Cr-5Mo-0.23 C alloy[J]. Journal of Materials Science, 2011, 46(1): 254-262. [14] KHAIMANEE P, CHOUNGTHONG P, UTHAISANGSUK V.Effects of isothermal aging on microstructure evolution, hardness and wear properties of wrought Co-Cr-Mo alloy[J]. Journal of Materials Engineering and Performance, 2017, 26(3): 955-968. [15] GARCÍA A D J S, MEDRANO A M, RODRÍGUEZ A S. Formation of HCP martensite during the isothermal aging of an FCC Co-27Cr-5Mo-0.05C orthopedic implant alloy[J]. Metallurgical & Materials Transactions A, 1999, 30(5): 1177-1184. [16] LASHGARI H R, ZANGENEH S, HASANABADI F, et al.Microstructural evolution during isothermal aging and strain- induced transformation followed by isothermal aging in Co- Cr-Mo-C alloy: A comparative study[J]. Materials Science and Engineering A, 2010, 527(16/17): 4082-4091. [17] SALDIVAR G, MANI M, SALINAS R.Effect of solution treatments on the FCC/HCP isothermal martensitic transformation in Co-27Cr-5Mo-0.05C aged at 800 ℃[J]. Scripta Materialia, 1999, 40(6): 717-722. [18] MINETA S, NAMBA S, YONEDA T, et al.Carbide formation and dissolution in biomedical Co-Cr-Mo alloys with different carbon contents during solution treatment[J]. Metallurgical and Materials Transactions A, 2010, 41(8): 2129-2138. [19] BALAGNA C, SPRIANO S, FAGA M G.Characterization of Co-Cr-Mo alloys after a thermal treatment for high wear resistance[J]. Materials Science and Engineering C, 2012, 32(7): 1868-1877. [20] BARUCCA G, SANTECCHIA E, MAJNI G, et al.Structural characterization of biomedical Co-Cr-Mo components produced by direct metal laser sintering[J]. Materials Science and Engineering C, 2015, 48(3): 263-269. [21] SAGE M, GUILLAUD C.Méthode d’analyse quantitative des variétés allotropiques du cobalt par les rayons X[J]. Revue de Metallurgie, 1950, 47(2): 139-145. [22] HASSANI F Z, KETABCHI M, BRUSCHI S, et al.Effects of carbide precipitation on the microstructural and tribological properties of Co-Cr-Mo-C medical implants after thermal treatment[J]. Journal of Materials Science, 2016, 51(9): 4495-4508. [23] GARCÍA A D J S, MEDRANO A M, RODRÍGUEZ A S. Formation of HCP martensite during the isothermal aging of an FCC Co-27Cr-5Mo-0.05C orthopedic implant alloy[J]. Metallurgical & Materials Transactions A, 1999, 30(5): 1177-1184. [24] RAMIREZ L E, CASTRO M, MÉNDEZ M, et al. Precipitation path of secondary phases during solidification of the Co-25.5% Cr-5.5%Mo-0.26% C alloy[J]. Scripta materialia, 2002, 47(12): 811-816. [25] KILNER T, PILLIAR R M, WEATHERLY G C, et al.Phase identification and incipient melting in a cast Co-Cr surgical implant alloy[J]. Journal of Biomedical Materials Research, 1982, 16(1): 63-79. [26] MONTERO-OCAMPO C, LOPEZ H, TALAVERA M .Effect of alloy preheating on the mechanical properties of as-cast Co-Cr-Mo-C alloys[J]. Metallurgical and Materials Transactions A (Physical Metallurgy and, Materials Science), 1999, 30(3): 611-620. [20] Mater Sci Eng A, 2004, 366: 282-291. [21] ABDULSTAAR M, MHAEDE M, WAGNER L, et al.Corrosion behaviour of Al 1050 severely deformed by rotary swaging[J]. Materials & Design, 2014, 57: 325-329. [22] XU X J, WANG C S, GUO Y F, et al.Effect of solid solution-cold deformation-prerecovery on microstructure and properties of Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr aluminum alloy[J]. Transactions of Materials & Heat Treatment, 2017, 38(1): 37-42.
2020, Vol. 25 
