Microstructure and mechanical properties of high strength and toughness hot die steel SR19

doi:10.13251/j.issn.0254-6051.2022.01.025

Abstract

Abstract: Microstructure and mechanical properties of hot die steel SR19 under different quenching and tempering processes were studied and compared with H13 steel by means of impact test, hardness test, microstructure observation and fracture analysis. The results show that when quenching at 960-1060 ℃, the hardness of SR19 steel is 3-4 HRC higher than that of H13 steel. When tempered at higher than 540 ℃, the hardness of SR19 steel is 0.5-1.0 HRC higher than that of H13 steel at the same tempering temperature, meanwhile, the impact absorbed energy of SR19 steel is 40-50 J higher than that of H13 steel. The addition of Mo and W increases the amount of nano-precipitated phase, improves the temper softening resistance, and makes the dimple of impact fracture smaller. The optimum heat treatment process of the tested steel is oil quenched at 1020 ℃, tempered at 560-600 ℃, by which the optimum hardness is 50.9-54.8 HRC.

Key words: hot die steel, heat treatment, secondary hardening

CLC Number:

TG161

Hu Tao, Wu Riming, Li Fangjie, Xiang Shaosong, Huang Shan. Microstructure and mechanical properties of high strength and toughness hot die steel SR19[J]. Heat Treatment of Metals, 2022, 47(1): 149-155.

References

[1]Liu Bin, Wang Bo, Yang Xudong, et al. Thermal fatigue evaluation of AISI H13 steels surface modified by gas nitriding with pre- and post-shot peening[J]. Applied Surface Science, 2019, 483: 45-51.
[2]Zhang Cheng, Li Pu, Wei Shizhong, et al. Effect of tempering temperature on impact wear behavior of 30Cr3Mo2WNi hot-working die steel[J]. Frontiers in Materials, 2019, 6: 149.
[3]Jiang Qichuan, Zhao Xumin, Qiu Feng, et al. The relationship between oxidation and thermal fatigue of martensitic hot-work die steels[J]. Acta Metallurgica Sinica, 2018, 31(7): 692-698.
[4]Cong Dalong, Zhou Hong, Ren Zhenan, et al. Thermal fatigue resistance of hot work die steel repaired by partial laser surface remelting and alloying process[J]. Optics and Lasers in Engineering, 2014, 54: 55-61.
[5]Ryuichiro Ebara. Fatigue crack initiation and propagation behavior of forging die steels[J]. International Journal of Fatigue, 2009, 32(5): 830-840.
[6]Jiang Q C, Sui H L, Guan Q F. Thermal fatigue behavior of new type high-Cr cast hot work die steel[J]. ISIJ International, 2007, 44(6): 1103-1107.
[7]潘晓华, 朱祖昌. H13热作模具钢的化学成分及其改进和发展的研究[J]. 模具制造, 2006, 6(4): 78-85.
Pan Xiaohua, Zhu Zuchang. The study of the chemical composition and improvement and development for the H13 hot work die and mold steel[J]. Die and Mould Manufacture, 2006, 6(4): 78-85.
[8]Xia P C, Han G P, Xie K, et al. Heat treatment process of a newly developed hot work tool steel[J]. Transactions of Materials and Heat Treatment, 2014, 35(1): 109-114.
[9]金欣, 周健, 迟宏宵, 等. 钨对热锻模具钢一次碳化物形貌及冲击性能的影响[J]. 金属热处理, 2018, 43(3): 35-39.
Jin Xin, Zhou Jian, Chi Hongxiao, et al. Effect of tungsten content on eutectic carbides morphology and impact property of hot-working die steels[J]. Heat Treatment of Metals, 2018, 43(3): 35-39.
[10]朱春燕, 石楠楠, 左鹏鹏, 等. Mn和W元素对4Cr2Mo2W2V模具钢热稳定性的影响[J]. 材料热处理学报, 2014, 35(S2): 66-69.
Zhu Chunyan, Shi Nannan, Zuo Pengpeng, et al. Effect of Mn and W on thermal stability of 4Cr2Mo2W2V die steel[J]. Transactions of Materials and Heat Treatment, 2014, 35(S2): 66-69.
[11]吴晓春, 左鹏鹏. 国内外热作模具钢发展现状与趋势[J]. 模具工业, 2013, 39(10): 1-9.
Wu Xiaochun, Zuo Pengpeng. Development status and trend of hot working die steels at home and abroad[J]. Die and Mould Industry, 2013, 39(10): 1-9.
[12]吴晓春, 施渊吉. 热锻模材料的发展现状与趋势[J]. 模具工业, 2015, 41(8): 1-10.
Wu Xiaochun, Shi Yuanji. Development status and trend of hot forging die materials[J]. Die and Mould Industry, 2015, 41(8): 1-10.
[13]田子启, 曹建春, 周晓龙, 等. 回火温度和Mo对Ti微合金化钢组织和性能的影响[J]. 材料热处理学报, 2016, 37(6): 156-162.
Tian Ziqi, Cao Jianchun, Zhou Xiaolong, et al. Effect of tempering and Mo on microstructure and properties of Ti microalloyed steel[J]. Transactions of Materials and Heat Treatment, 2016, 37(6): 156-162.
[14]王香彬, 韦弦, 孙斌, 等. 含Mo低碳贝氏体钢形变奥氏体连续冷却相变规律研究[J]. 河南冶金, 2011, 19(2): 16-18.
Wang Xiangbing, Wei Xuan, Sun Bing, et al. Study on continuous cooling transformation behavior for deformed austenite in the Mo-bearing low-carbon bainite steel[J]. Henan Metallurgy, 2011, 19(2): 16-18.
[15]李成良, 黄远坚, 温志红, 等. 合金元素Mo和V对模具钢组织性能的影响[J]. 金属材料与冶金工程, 2017, 45(S1): 5-10.
Li Chengliang, Huang Yuanjian, Wen Zhihong, et al. Effect of Mo and V on the microstructure and property of mould steel[J]. Metal Materials and Metallurgy Engineering, 2017, 45(S1): 5-10.
[16]Moor E D, Matlock D K, Speer J G, et al. Austenite stabilization through manganese enrichment[J]. Scripta Materialia, 2011, 64(2): 185-188.
[17]Chen Ying, Chen Zaizhi, Dong Han, et al. Advance in research of tempering secondary hardening of alloy tool and die steel Fe-M-C quenched martensite[J]. Special Steel, 2004(2): 35-38.
[18]Sandberg O, Klarenfjord B, Miller P. Properties profile: Comparison of premium quality H13 & modified hot work die steel[J]. Die Casting Engineer, 2002, 46(3): 40-49.
[19]金欣, 周健, 迟宏宵, 等. Mo-W-Co系高热强性热锻模具钢的组织与性能[J]. 金属热处理, 2018, 43(2): 8-15.
Jin Xin, Zhou Jian, Chi Hongxiao, et al. Microstructure and mechanical properties of Mo-W-Co high hot-strength hot-work die steels[J]. Heat Treatment of Metals, 2018, 43(2): 8-15.
[20]DIEVAR/8418钢[Z]. 热处理技术与装备, 2018, 39(3): 57.
[21]陈英伟, 吴晓春. 几种典型热作模具钢性能的对比[J]. 机械工程材料, 2010, 34(2): 27-29, 34.
Cheng Yingwei, Wu Xiaochun. Comparison of properties for several typical hot work die steels[J]. Materials for Mechanical Engineering, 2010, 34(2): 27-29, 34.
[22]Zhou J, Ma D S, Chi H X, et al. Microstructure and properties of hot working die steel H13MOD[J]. Journal of Iron and Steel Research International, 2013, 20(9): 117-125.
[23]Inoue A, Masumoto T. Carbide reactions(M₃C→M₇C₃→M₂₃C₆→M₆C) during tempering of rapidly solidified high carbon Cr-W and Cr-Mo steels[J]. Metallurgical Transactions A, 1980, 11(5): 739-747.
[24]Liu Tianlong, Chen Lijia, Bi Hongyun, et al. Effect of Mo on high-temperature fatigue behavior of 15CrNbTi ferritic stainless steel[J]. Acta Metallurgica Sinica, 2014, 27(3): 452-456.
[25]崔忠析, 覃耀春. 金属学与热处理[M]. 北京: 机械工业出版社, 2007: 312-313.
[26]Hu X, Li L, Wu X. Coarsening behavior of M₂₃C₆ carbides after ageing or thermal fatigue in AISI H13 steel with niobium[J]. International Journal of Fatigue, 2006, 28(3): 175-182.
[27]符仁钰, 刘以宽. 铸造H13钢的回火转变及碳化物的研究[J]. 材料热处理学报, 1992, 13(3): 28-32.
Fu Renyu, Liu Yikuan. Study on tempering transformation and carbide of cast H13 steel[J]. Transactions of Materials and Heat Treatment, 1992, 13(3): 28-32.
[28]陈英伟, 吴晓春, 宋雯雯, 等. 含铌热作模具钢中碳化物的演变对热稳定性的影响[J]. 材料热处理学报, 2010, 31(5): 75-80.
Chen Yingwei, Wu Xiaochun, Song Wenwen, et al. Effect of carbides evolution on thermal-stability in Nb-microalloyed hot work steel[J]. Transactions of Materials and Heat Treatment, 2010, 31(5): 75-80.
[29]Horn R M, Ritchie R O. Mechanisms of tempered martensite embrittlement in low alloy steels[J]. Metallurgical Transactions A, 1978, 9: 1039-1053.
[30]Michaud P, Delagnes D, Lamesle P, et al. The effect of the addition of alloying elements on carbide precipitation and mechanical properties in 5% chromium martensitic steels[J]. Acta Materialia, 2007, 55(14): 4877-4889.