Effects of sintering temperature and heat treatment on microstructure and properties of 4605 low alloy steel prepared by powder injection molding
HUANG Yuqing1, HE Hao2, LOU Jia3, LI Yimin1,2, PENG Yuandong1, LIU Chen2, QIN Jianchun2
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Research Center of Materials Science and Engineering,Guangxi University of Science and Technology, Liuzhou 545006, China; 3. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
Abstract:4605 low alloy steel was prepared from 4605 master alloy powder by injection molding and sintering at 1 320-1 380 ℃. The effects of sintering temperature and heat treatment process on the microstructure, hardness and tensile strength of alloy steel were studied by three different processes of heat treatment. The results show that,the sintering density of 4605 low alloy steel increases with the increase of sintering temperature, the microstructure is composed of lath martensite and polygonal ferrite, the hardness and tensile strength of alloy steel increase with the increase of sintering temperature. The optimum properties of low alloy steel are obtained after sintered at 1 380 ℃, with its density up to 96.38% and the tensile strength is 613 MPa. The plasticity increases first and then decreases with the increase of temperature. At 1 360 ℃, the elongation of the sintered sample is optimal, reaching 13.50%. The martensite structure can be obtained through heat preservation at 800 ℃ for 0.5 h, and then at 200 ℃ for 2 h after oil quenching. The tensile strength and hardness of the sample attain to optimum, that is 708 MPa and 78.8 HRA respectively. The tempered sorbite can be obtained by heat preservation at 800 ℃ for 1 h followed by heat preservation at 600 ℃ for 2 h after oil quenching. The elongation of the sample is optimal, reaching 18.76%.
黄雨晴, 何浩, 娄嘉, 李益民, 彭元东, 刘晨, 秦健春. 烧结温度及热处理对注射成形4605低合金钢组织与性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(6): 549-556.
HUANG Yuqing, HE Hao, LOU Jia, LI Yimin, PENG Yuandong, LIU Chen, QIN Jianchun. Effects of sintering temperature and heat treatment on microstructure and properties of 4605 low alloy steel prepared by powder injection molding. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 549-556.
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