Grain refinement and strength-toughness improvement process of 20Si2Mn2CrNi steel after forging

doi:10.13251/j.issn.0254-6051.2023.07.027

Abstract

Abstract: Microstructure and mechanical properties of Si-Mn-Cr-Ni low alloy high strength steel under different heat treatment processes were studied. The results show that when normalized at 820 ℃, the microstructure of the tested steel is fine and evenly distributed, when followed by quenching at 920 ℃ and tempering at 280 ℃, the hardness of the steel is 43.9 HRC, the impact absorbed energy KV₂ is 82.6 J, the tensile strength is 1513.35 MPa, the yield strength is 1221.92 MPa and the elongation is 14.65%. Moreover, the microstructure is tempered lath martensite with fine grain size of grade 8.3,which achieves the best strength-toughness matching and the best comprehensive mechanical properties.

Key words: low alloy high strength steel, heat treatment process, microstructure, grain size, mechanical properties

CLC Number:

TG142.1

Li Shiwen, Xiong Wei, Zhang Wenliang, Wang Chao, Gao Zhanyong. Grain refinement and strength-toughness improvement process of 20Si2Mn2CrNi steel after forging[J]. Heat Treatment of Metals, 2023, 48(7): 157-161.

References

[1]Furuhara T, Kikumoto K, Saito H, et al. Phase transformation from fine-grained austenite[J]. ISIJ International, 2008, 48(8): 1038-1045.
[2]文凤, 陈永利, 周雪娇, 等. 循环淬火对B/M超高强钢奥氏体晶粒细化的影响[J]. 热加工工艺, 2017, 46(8): 196-198.
Wen Feng, Chen Yongli, Zhou Xuejiao, et al. Influences of cycle quenching on austenite grain refinement of B/M ultra-high strength stee[J]. Hot Working Technology, 2017, 46(8): 196-198.
[3]李建华, 习天辉, 陈晓. 热处理对3.5Ni钢低温韧性的作用[J]. 物理测试, 2008, 26(6): 9-12.
Li Jianhua, Xi Tianhui, Chen Xiao. Effect of heat treatment on low-temperature toughness of 3.5Ni steel[J]. Physics Examination and Testing, 2008, 26(6): 9-12.
[4]Gu J F, Han L Z, Chen R K. Effect of normalising on grain refinement of large low pressure rotors: Numerical and experimental studies[J]. International Heat Treatment and Surface Engineering, 2013, 8(2): 70-75.
[5]俄馨, 李岗, 史伟, 等. 热处理工艺对16Mn钢锻件显微组织和力学性能的影响[J]. 理化检验-物理分册, 2022, 58(3): 6-9.
E Xin, Li Gang, Shi Wei, et al. Influence of heat treatment processon microstructure and mechanical properties of 16Mn steel forging[J]. Physical Testing and Chemical Analysis(Part A: Physical Testing), 2022, 58(3): 6-9.
[6]王凯, 党淑娥, 何艳, 等. 30Cr2Ni4MoV钢消除混晶的方法[J]. 大型铸锻件, 2013, 156(6): 9-12.
Wang Kai, Dang Shue, He Yan, et al. Methods of eliminating mixed grains in 30Cr2Ni4MoV steel[J]. Heavy Casting and Forging, 2013, 156(6): 9-12.
[7]冯丹竹, 隋轶, 张宏亮, 等. 正火工艺对12Cr1MoV合金结构钢组织性能的影响[J]. 宽厚板, 2022, 28(1): 1-5.
Feng Danzhu, Sui Tie, Zhang Hongliang, et al. Effects of normalizing process on microstructure and properties of 12Cr1MoV alloy structural steel[J]. Wide and Heavy Plate, 2022, 28(1): 1-5.
[8]杨劼, 任慧平, 刘宗昌. 15Cr12CuSiMoMn钢的奥氏体晶粒长大动力学[J]. 金属热处理, 2022, 47(2): 53-58.
Yang Jie, Ren Huiping, Liu Zongchang. Kinetics of austenite grain growth of 15Cr12CuSiMoMn steel[J]. Heat Treatment of Metals, 2022, 47(2): 53-58.
[9]王宇. T23钢组织与性能的研究[D]. 哈尔滨: 哈尔滨工程大学, 2007.
[10]Deng X T, Wang Z D, Han Y, et al. Microstructure and abrasive wear behavior of medium carbon low alloy martensitic abrasion resistant steel[J]. Journal of Iron and Steel Research International, 2014, 21(1): 98-103.
[11]杨进德, 丁旭. 淬火对Cr-Mo-Ni-Mn-Si低合金耐磨钢组织与硬度的影响[J]. 铸造技术, 2021, 42(7): 613-616.
Yang Jinde, Ding Xu. Effect of quenching on microstructure and hardness of Cr-Mo-Ni-Mn-Si low alloy wear resistant steel[J]. Foundry Technology, 2021, 42(7): 613-616.

[1]	Zheng Bing, Xu Dong, Wang Yiqun, Wang Xuexi, Zhao Hongyang, Ju Dongying. Austenite grain distribution law in 34CrNi3MoV steel [J]. Heat Treatment of Metals, 2023, 48(7): 1-7.
[2]	Liu Lei, Guo Feihu, Shi Pengzhao, Qiao Jialong, Qiu Shengtao. Effect of primary recrystallization annealing temperature on microstructure and texture of low temperature Hi-B steel [J]. Heat Treatment of Metals, 2023, 48(7): 8-14.
[3]	Wu Zhongchao, Zhou Yongjun, Duan Baoyu, Hou Yuan, Hu Yunfei, Gao Zhanyong. Isothermal microstructure and strength and toughness of 20Si2Mn2CrNi steel below Ms [J]. Heat Treatment of Metals, 2023, 48(7): 15-21.
[4]	Han Shun, Li Gang, Yang Hao, Li Xinyang, Li Yong, Wang Chunxu. Effect of tempering temperature on microstructure and mechanical properties of N63 steel [J]. Heat Treatment of Metals, 2023, 48(7): 79-83.
[5]	Zhang Laichao, Jin Yunxue, Zhu Xuwei, Wang Bingsheng, Jia Boshan. Heat treatment of high performance rolled steel balls for large ball mills [J]. Heat Treatment of Metals, 2023, 48(7): 84-90.
[6]	Jing Qingxiu, Wei Dandan, Wei Miao, Yang Xueqing, Xiao Xiangpeng, Hang Xiaodong. Effect of deformation heat treatment on microstructure and properties of Cu-6Ni-3Ti alloy [J]. Heat Treatment of Metals, 2023, 48(7): 91-96.
[7]	Zhu Jiaxin, Sun Youping, Xie Shangheng, Fang Dejun, Zhou Yong. Effect of solution-aging treatment on microstructure and damping properties of Mg-4Zn-0.3Zr alloy [J]. Heat Treatment of Metals, 2023, 48(7): 97-102.
[8]	Liu Yongbao, Zhou Lina, Liu Ming, Gao Xiang, Shi Dongdan. Effect of tempering parameters on microstructure and mechanical properties of G95Cr18 martensitic stainless steel [J]. Heat Treatment of Metals, 2023, 48(7): 103-110.
[9]	Wang Junliang, Zhou Tiezhu, Fu Liguo, Yu Yan, Li Chunhui. Influence of stress relieving annealing on surface residual stress,microstructure and properties of B10 colomony equal diameter tee [J]. Heat Treatment of Metals, 2023, 48(7): 111-116.
[10]	Gong Xueting, Zhao Jiqing, Yang Gang, Yang Bin. Effect of tempering temperature on microstructure and properties of 20Cr1Mo1VTiB bolt steel [J]. Heat Treatment of Metals, 2023, 48(7): 117-123.
[11]	Tang Peng, Huang Jialiang, Liu Qiannan, Deng Songyun. Effect of aging time on microstructure and properties of 7075-T6 aluminum alloy [J]. Heat Treatment of Metals, 2023, 48(7): 131-137.
[12]	Xiong Xuegang, Chen Shu, Chen Shu, Lü Bing, Zhang Kaihua, Zhou Leilei, Zhou Wei. Effect of tempering process on microstructure and properties of Q125 high strength oil well pipe steel [J]. Heat Treatment of Metals, 2023, 48(7): 138-142.
[13]	Hu Wu, Wu Yanmei, Huang Xianzan, Huang Yanyi, Liao Bin. Effect of pre-treatment on properties of 6082 aluminium alloy profiles [J]. Heat Treatment of Metals, 2023, 48(7): 143-147.
[14]	Wang Haojun, Hu Shengshuang, Xiao Jun, Zhang Ying, Zhang Yingyun, Gao Tingting, Ouyang Delai. Microstructure and properties of TC4 titanium alloy butt welding brazed joint with B-Ti57CuZrNi solder [J]. Heat Treatment of Metals, 2023, 48(7): 148-151.
[15]	Wang Huimin, Li Yanguang, Wu Jingyi. Effect of solution time on microstructure and mechanical properties of 2219 aluminum alloy [J]. Heat Treatment of Metals, 2023, 48(7): 152-156.