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.
[1] AZEVEDO J M C, SERRENHO A C, ALLWOOD J M. Energy and material efficiency of steel powder metallurgy[J]. Powder Technology, 2018, 328(1): 329-336 [2] ANATOLII L, BARBARA R, OLEKSANDR T, et al.Influence of the impact sintering temperature on the structure and properties of samples from the different iron powders[J]. Advanced Powder Technology, 2017, 28(2): 363-374. [3] YE Yongquan, LI Xiaoqiang, CHENG Zhun, et al.The influence of sintering temperature and pressure on microstructure and mechanical properties of carbonyl iron powder materials fabricated by electric current activated sintering[J]. Vacuum, 2017, 137(3): 137-147. [4] CRISTOFOLINI I, PILLA M, RAO A, et al.Dimensional and geometrical precision of powder metallurgy parts sintered and sinterhardened at high temperature[J]. International Journal of Precision Engineering & Manufacturing, 2013, 14(10): 1735-1742. [5] 王天国, 梁启超, 覃群. 烧结温度对Fe-Cu-Mo-C合金组织和性能的影响[J]. 粉末冶金工业, 2016, 26(2): 27-30. WANG Tianguo, LIANG Qichao, QIN Qun.Influence of sintering temperature on microstructure and properties of Fe-Cu-Mo-C alloys[J]. Powder Metallurgy Industry, 2016, 26(2): 27-30. [6] 孙芳芳, 马少波, 毕岗, 等. 烧结温度对粉末冶金低合金钢显微组织和力学性能的影响[J]. 机械工程材料, 2017, 41(10): 48-51. SUN Fangfang, MA Shaobo, BI Gang, et al.Influence of Sintering temperature on microstructure and mechanical properties of powder metallurgy low-alloy steel[J]. Materials for Mechanical Engineering, 2017, 41(10): 48-51. [7] 刘文胜, 张壹金, 马运柱,等.烧结温度对30Cr粉末冶金低合金钢组织与性能的影响[J]. 粉末冶金技术, 2018, 36(5): 342-347. LIU Wensheng, ZHANG Yijin, MA Yunzhu, et al.Effect of sintering temperature on the microstructures and properties of 30Cr powder metallurgy low alloy steel[J]. Powder Metallurgy Technology, 2018, 36(5): 342-347. [8] 王腾. 基于热力学设计的粉末冶金4605合金的热处理工艺研究[D]. 湘潭: 湘潭大学, 2019. WANG Teng.Study on heat treatment process of powder metallurgy 4605 alloy based on thermodynamic design[D]. Xiangtan: Xiangtan University, 2019. [9] SEOK G L, SEOK S S, BOHEE K, et al.Effects of martensite-austenite constituent on crack initiation and propagation in inter-critical heat-affected zone of high-strength low-alloy (HSLA) steel[J]. Materials Science and Engineering A , 2018, 715(3): 332-339. [10] 王乐, 易健宏, 戴煜, 等. 压制压力对粉末冶金烧结硬化钢性能的影响[J]. 粉末冶金材料科学与工程, 2008, 13(2): 97-101. WANG Le, YI Jianhong, DAI Yu, et al.Influence of compacting pressure on properties of sinter-hardening P/M steels[J]. Materials Science and Engineering of Powder Metallurgy, 2008, 13(2): 97-101. [11] GERMAN R M, XU X, LIU Y.Reconciliation of sintering theory and practice[J]. Metal Powder Report, 2001, 56(9): 37-38. [12] 阮建明, 黄培云. 粉末冶金原理[M]. 北京: 机械工业出版社, 2012. RUAN Jianming, HUANG Peiyun.Theory of Power Metallurgy[M]. Beijing: Metallurgical Industry Press, 2012. [13] QIAO Zhixia, LIU Yongchang, YU Liming, et al.Formation mechanism of granular bainite in a 30CrNi3MoV steel[J]. Journal of Alloys and Compounds, 2009, 475(1): 560-564. [14] ZHOU Yanlei, TAO Jia, ZHANG Xiangjun, et al.Investigation on tempering of granular bainite in an offshore platform steel[J]. Materials Science and Engineering A, 2015, 626(4): 352-361. [15] 高为国, 钟利萍, 夏卿坤, 等. 机械工程材料[M]. 长沙: 中南大学出版社, 2012. GAO Weiguo, ZHONG Liping, XIA Qinkun, et al.Materials for Mechanical Engineering[M]. Changsha: Central South University Press, 2012. [16] 常翔鸣. 热处理工艺对低合金耐磨钢组织和性能的影响[D]. 包头: 内蒙古科技大学, 2013. CHANG Xiangming.Effects of heat treatment process on microstructures and properties of low alloy wear resistant steel[D]. Baotou: Inner Mongolia University of Science & Technology, 2013.
2019, Vol. 24 
