固溶温度对选区激光熔化GH3625合金显微组织及力学性能的影响

Effect of Solution Temperature on Microstructure and Mechanical Properties of Selective Laser Melting GH3625 Alloy

采用选区激光熔化(SLM)成形GH3625合金,采用单因素法研究了固溶温度对SLM成形GH3625合金组织及力学性能的影响,并初步探讨了其机理。结果表明,随固溶温度的升高,Laves相完全固溶,针状δ相和碳化物大量弥散析出,组织趋于均匀化;合金的维氏硬度和抗拉强度呈现出先增后减的趋势,在900℃时,维氏硬度和抗拉强度达到最大,分别为324 HV和990.82 MPa,拉伸伸长率保持在34%以上,且断口伴有韧窝,合金为塑性失效。

GH3625 alloy was formed by selective laser melting(SLM).The single factor method was used to study the effect of solution temperature on the microstructure and mechanical properties of GH3625 alloy formed by SLM were studied,and its mechanism was preliminarily discussed.The results show that with the increase of the solution temperature,the Laves phase is completely dissolved,A large amounts of the needle-likeδphase and carbides are dispersed and precipitated,and the microstructure tends to be uniform,the Vickers hardness and tensile strength of the GH3625 alloy show a trend of increasing first and then decreasing.At 900℃,the Vickers hardness and tensile strength reached the maximum,324 HV and 990.82 MPa,respectively.The tensile elongation of the specimen remains above 34%,and the fracture surface with dimple,the alloy is plastic failure.