Heat treatment for toughening technology of cold working die steel SKD11

doi:10.13251/j.issn.0254-6051.2023.09.001

Abstract

Abstract: SKD11 steel plate after hot rolling and spheroidizing annealing was used. Two kinds of complex phase heat treatment processes, A-Q-A (Austempering-Quenching-Austempering) and Q-T-A (Quenching-Tempering-Austempering), as well asconventional Q-T(Quenching-Tempering) heat treatment process were carried out.The effect of heat treatment process on the microstructure, hardness and impact absorbed energy was studied. The results show that the microstructure of the specimens after A-Q-A and Q-T-A is the combination of lower bainite (LB) and martensite (M). The content of retained austenite is 13.2% and 18.6% for A-Q-A and Q-T-A, respectively. After A-Q-A, Q-T-A and conventional heat treatment Q-T, the hardness of the specimens is 58.5, 58.6 and 60.5 HRC and the impact absorbed energy is 31.3, 27.6 and 15 J, respectively. The excellent combination of strength and toughness of the SKD11 steel plate is realized by the duplex-phase heat treatments, which does a beneficial exploration in improving the toughness of the cold working die steel.

Key words: SKD11 steel, duplex phase heat treatment, microstructure, impact property, retained austenite

CLC Number:

TG161

Yuan Zhizhong, Wang Mengfei, Zhang Bocheng, Duan Xubin, Li Biaomin, Yang Haifeng, Luo Rui, Cheng Xiaonong. Heat treatment for toughening technology of cold working die steel SKD11[J]. Heat Treatment of Metals, 2023, 48(9): 1-7.

References

[1]崔崑. 国内外模具用钢发展概况[J]. 金属热处理, 2007, 32(1): 1-11.
Cui Kun. Development of die and mould steels at home and abroad[J]. Heat Treatment of Metals, 2007, 32(1): 1-11.
[2]潘金芝, 任瑞铭, 戚正风. 国内外模具钢发展现状[J]. 金属热处理, 2008, 33(8): 10-15.
Pan Jinzhi, Ren Ruiming, Qi Zhengfeng. Development status of model steels at home and abroad[J]. Heat Treatment of Metals,2008, 33(8): 10-15.
[3]魏兴钊, 朱伟恒, 覃宁, 等. Cr12型钢制冷作模具的失效分析与探讨[J]. 金属热处理, 2011, 36(1): 14-23.
Wei Xingzhao, Zhu Weiheng, Qin Ning, et al. Failure analysis and discussion of Cr12 type steel cold work dies[J]. Heat Treatment of Metals, 2011, 36(1): 14-23.
[4]罗楠. Cr12MoV钢的强韧化处理工艺研究[J]. 中国铸造装备与技术, 2019, 54(1): 50-52.
Luo Nan. Study on strengthening and toughening treatment process of Cr12MoV steel[J]. China Foundry Machinery and Technology, 2019, 54(1): 50-52.
[5]张玉, 周晓玲. Cr12MoV钢二次硬化及强化机理研究[J]. 热加工工艺, 2016, 45(8): 213-216, 20.
Zhang Yu, Zhou Xiaoling. Study on secondary hardening and strengthening mechanism of Cr12MoV steel[J]. Hot Working Technology, 2016, 45(8): 213-216, 20.
[6]李元洪, 刘丹, 孙红星, 等. Cr12MoV模具钢强韧化热处理[J]. 金属热处理, 2010, 35(6): 119-121.
Li Yuanhong, Liu Dan, Sun Hongxing, et al. Strengthening and toughening treatment of Cr12MoV steel dies[J]. Heat Treatment of Metals, 2010, 35(6): 119-121.
[7]Das D, Sarkar R, Dutta A K, et al. Influence of sub-zero treatments on fracture toughness of AISI D2 steel[J]. Materials Science and Engineering A, 2010, 528(2): 589-603.
[8]Li S, Xie Y, Wu X. Hardness and toughness investigations of deep cryogenic treated cold work die steel[J]. Cryogenics, 2010, 50(2): 89-92.
[9]Vahdat S E, Nategh S, Mirdamadi S. Microstructure and tensile properties of 45WCrV7 tool steel after deep cryogenic treatment[J]. Materials Science and Engineering A, 2013, 585(15): 444-454.
[10]Bigg T D, Edmonds D V, Eardley E S. Real-time structural analysis of quenching and partitioning (Q&P) in an experimental martensitic steel[J]. Journal of Alloys and Compounds, 2013, 577: S695-S698.
[11]Clarke A J, Speer J G, Matlock D K, et al. Influence of carbon partitioning kinetics on final austenite fraction during quenching and partitioning[J]. Scripta Materialia, 2009, 61(2): 149-152.
[12]Paravicini B E, Santofimia M J, Zhao L, et al. Microstructure, tensile and toughness properties after quenching and partitioning treatments of a medium-carbon steel[J]. Materials Science and Engineering A, 2013, 559: 486-495.
[13]Qin S, Liu Y, Hao Q, et al. The mechanism of high ductility for novel high-carbon quenching-partitioning-tempering martensitic steel[J]. Metallurgical and Materials Transactions A, 2015, 46(9): 4047-4055.
[14]Wang K, Gu K, Miao J, et al. Toughening optimization on a low carbon steel by a novel quenching-partitioning-cryogenic-tempering treatment[J]. Materials Science and Engineering A, 2019, 743: 259-264.
[15]韦家波. M/B复相热处理工艺对H13钢组织与性能的影响规律[D]. 镇江: 江苏大学, 2020.
[16]孙培祯, 文翠娥, 赵建生, 等. 马氏体/下贝氏体复相热处理对GD钢强韧性的影响[J]. 金属热处理学报, 1991, 12(3): 1-5.
Sun Peizhen, Wen Cui'e, Zhao Jiansheng, et al. Effect of dual phase heat treatment of martensite lower bainite on strength and toughness of GD steel[J]. Transactions of Metal Heat Treatment, 1991, 12(3): 1-5.
[17]林化春. Cr12钢马氏体-贝氏体复相处理强韧化及应用[J]. 金属热处理, 1997(5): 11-12, 8.
Lin Huachun. Strengthening and toughening technique and application on (M+B) dual-phase heat treating of Cr12 steel[J]. Heat Treatment of Metals, 1997(5): 11-12, 8.
[18]韦家波, 程晓农, 张伯承, 等. 硬岩掘进盾构机刀圈的热处理[J]. 金属热处理, 2020, 45(2): 114-119.
Wei Jiabo, Cheng Xiaonong, Zhang Bocheng, et al. Heat treatment of tunnel boring machine cutter ring for hard rock[J]. Heat Treatment of Metals, 2020, 45(2): 114-119.
[19]袁志钟, 段旭斌, 张伯承, 等. 一种兼顾析出强化与下贝氏体相变强化的热处理方法, CN111876569B [P/OL].
[20]占礼春, 马党参, 迟宏宵, 等. 冷作模具钢奥氏体化过程的碳化物溶解情况[J]. 钢铁研究学报, 2012, 24(10): 29-32, 8.
Zhan Lichun, Ma Dangshen, Chi Hongxiao, et al. Carbides dissolution of cold work die steels during austenitizing[J]. Journal of Iron and Steel Research, 2012, 24(10): 29-32, 8.
[21]张春基, 河镇哲, 马永庆. Cr-W-Mo-V-Si工模具钢热处理时碳化物的转变[J]. 金属热处理, 2001, 26(4): 24-26.
Zhang Chunji, He Zhenzhe, Ma Yongqing. Carbides transform in Cr-W-Mo-V-Si die steel during heat treatment[J]. Heat Treatment of Metals, 2001, 26(4): 24-26.
[22]並木邦夫. 模具材料性能与应用[M]. 模具材料性能与应用, 2014.
[23]Wieczerzak K, Bala P, Dziurka R, et al. The effect of temperature on the evolution of eutectic carbides and M₇C₃→M₂₃C₆ carbides reaction in the rapidly solidified Fe-Cr-C alloy[J]. Journal of Alloys and Compounds, 2017, 698: 673-684.
[24]马党参, 刘建华, 陈再枝, 等. 热处理工艺对新型Cr8Mo2VSi和D2冷作模具钢扁钢组织和力学性能的影响[J]. 钢铁, 2008, 43(9): 67-70.
Ma Dangshen, Liu Jianhua, Chen Zaizhi, et al. Effect of heat treatment process on microstructure and mechanical properties of Cr8Mo2VSi and D2 cold work steel[J]. Iron and Steel, 2008, 43(9): 67-70.
[25]文翠娥, 孙培祯, 谢长生, 等. 残余奥氏体对GD钢断裂韧性的影响[J]. 兵器材料科学与工程, 1992, 15(11): 1-6.
[26]康沫狂, 朱明. 淬火合金钢中的奥氏体稳定化[J]. 金属学报, 2005, 41(7): 673-679.
Kang Mokuang, Zhu Ming. Stabilization of austenite in quenched alloy steels[J]. Acta MetallurgIica Sinica, 2005, 41(7): 673-679.
[27]刘健波, 张学宾, 杨留栓, 等. 等温淬火时间对D2钢组织与力学性能的影响[J]. 材料热处理学报, 2019, 40(8): 110-115.
Liu Jianbo, Zhang Xuebin, Yang Liushuan, et al. Effect of austempering time on microstructure and mechanical properties of D2 steel[J]. Transactions of Materials and Heat Treatment, 2019, 40(8): 110-115.
[28]邓黎辉, 汪宏斌, 李绍宏, 等. 高强韧性冷作模具钢SDC55的Q-P-T工艺及性能[J]. 金属热处理, 2010, 35(9): 16-19.
Deng Lihui, Wang Hongbin, Li Shaohong, et al. Q-P-T process and properties of high strength and toughness cold work die steel SDC55[J].Heat Treatment of Metals, 2010, 35(9): 16-19.
[29]Speer J, Matlock D K, De Cooman B C, et al. Carbon partitioning into austenite after martensite transformation[J]. Acta Materialia, 2003, 51(9): 2611-2622.
[30]徐祖耀. 淬火-碳分配-回火(Q-P-T)工艺浅介[J]. 金属热处理, 2009, 34(6): 1-8.
Xu Zuyao. A brief introduction to quenching-partition-tempering (Q-P-T) process[J]. Heat Treatment of Metals, 2009, 34(6): 1-8.
[31]刘正东, 杨钢, 程世长, 等. 2.25Cr-1Mo钢回火过程中碳化物析出顺序的研究[J]. 金属热处理, 2005, 30(4): 32-34.
Liu Zhengdong, Yang Gang, Cheng Shichang, et al. Investigation of carbide precipitation order of 2.25Cr-1Mo steel during tempering[J]. Heat Treatment of Metals, 2005, 30(4): 32-34.
[32]惠卫军, 董瀚, 王毛球, 等. 回火温度对Cr-Mo-V系高强度钢力学性能的影响[J]. 金属学报, 2002, 38(10): 1009-1014.
Hui Weijun, Dong Han, Wang Maoqiu, et al. Effect of heat treatment parameters on mechanical properties of high strength Cr-Mo-V steel[J]. Acta MetallurgIica Sinica, 2002, 38(10): 1009-1014.