Simulated research on influence of carburized layer thickness on quenching distortion of 18Cr2Ni4WA steel gear

doi:10.13251/j.issn.0254-6051.2021.12.045

Abstract

Abstract: Influence of carburized layer on the temperature field, stress field and strain field of the 18Cr2Ni4WA steel arc-gear during gas quenching process was analyzed by means of finite element simulation software, and the action mechanism was explored further in combination with the first-principles method. The results show that the influence of depth of carburized layer on the temperature field of 18Cr2Ni4WA arc gear is small. But the stress field of surface layer in gear fluctuates is obvious when the depth of carburized layer is smaller than 0.5 mm, which increases from 86.7 MPa at the thickness 0.1 mm of the carburized layer to 278.6 MPa at 2.0 mm. The results of the strain field show that when the thickness of the carburized layer is 2.0 mm, the initial value of the equivalent strain on the surface of tooth top reaches 2%. The first-principles calculation results show that with the increase of carbon concentration, the bond strength between Fe-Fe atoms weakens. However, the newly formed Fe-C bond and Cr-C bond are obviously strengthened, and the electron density between Fe and C atoms shows obvious directionality. Therefore, the weakness of the Fe-Fe bond causes expansion coefficient of the 18Cr2Ni4WA steel to increase with the addition of carbon concentration. Then it will cause the heating-up distortion of the gear be not capable of recovering during the gas quenching and cooling process for its excessively thick carburized layer. As a result, the fluctuation of gear geometric dimension will be aggravated obviously.

Key words: carburized, 18Cr2Ni4WA steel, gear, quenching distortion, simulated research

CLC Number:

Kong Lingli, He Ruijun, Li Guifa. Simulated research on influence of carburized layer thickness on quenching distortion of 18Cr2Ni4WA steel gear[J]. Heat Treatment of Metals, 2021, 46(12): 268-275.

References

[1]Wang B, He Y P, Liu Y, et al. Mechanism of the microstructural evolution of 18Cr2Ni4WA steel during vacuum low-pressure carburizing heat treatment and its effect on case hardness[J]. Materials, 2020, 13(10): 2352.
[2]朱瑞芳, 刘永刚. 冷处理和深冷处理在渗碳齿轮件中的应用[J]. 金属热处理, 2020, 45(6): 77-80.
Zhu Ruifang, Liu Yonggang. Application of subzero and cryogenic treatment in carburized gear parts[J]. Heat Treatment of Metals, 2020, 45(6): 77-80.
[3]Yang J J, Pang K J. Elastoplastic behavior of case-Carburized 18Cr2Ni4WA steel by indenter testing[J]. Journal of Aerospace Engineering, 2019, 32(4): 04019045.
[4]许鸿翔, 王红伟, 张衡, 等. 20Cr2Ni4钢齿轮渗碳淬火及装配后开裂原因分析[J]. 金属热处理, 2021, 46(8): 250-253.
Xu Hongxiang, Wang Hongwei, Zhang Heng, et al. Crack analysis of case-hardened 20Cr2Ni4 steel gear after assembly[J]. Heat Treatment of Metals, 2021, 46(8): 250-253.
[5]Xia C B, Tu M W, Pan Q J, et al. Performance and property of Ni base coatings by using plasma arc technology for 18Cr2Ni4WA steel repairing[J]. Advanced Materials Research, 2011, 1165: 311-315.
[6]Song S Q, Cui X F, Jin Guo, et al. Effect of N+Cr ions implantation on corrosion and tribological properties in simulated seawater of carburized alloy steel[J]. Surface and Coatings Technology, 2020, 385: 125357.
[7]Wang B, He Y P, Liu Y, et al. Thermodynamics of phase transformation and microstructure evolution of 18Cr2Ni4WA carburized steel during high-Temperature tempering[J]. Steel Research International, 2020, 91(8): 2000094.
[8]雷艳惠, 王鹏彬. 18Cr2Ni4WA 钢旋耕机大模数齿轮热处理工艺研究[J]. 金属制品, 2016, 42(3): 13-15, 23.
Lei Yanhui, Wang Pengbin. Study on heat treatment process of large module gear for 18Cr2Ni4WA steel rotary tiller[J]. Steel Wire Products, 2016, 42(3): 13-15, 23.
[9]赵荣达, 刁瑞佳, 靳琳琳, 等. 淬火-配分(Q-P)热处理对18Cr2Ni4W钢渗碳层组织和硬度的影响[J]. 金属热处理, 2016, 41(2): 159-162.
Zhao Rongda, Diao Ruijia, Jin Linlin, et al. Effect of quenching-partitioning(Q-P) heat treatment on microstructure and hardness of carburized layer on 18Cr2Ni4W stee[J]. Heat Treatment of Metals, 2016, 41(2): 159-162.
[10]李锋, 王新宇, 李世键, 等. 18Cr2Ni4WA 钢衬套的精密气体渗碳淬火热处理[J]. 金属热处理, 2016, 41(4): 154-157.
Li Feng, Wang Xinyu, Li Shijian, et al. Precise gas carburizing quenching process of 18Cr2Ni4WA steel bushes[J]. Heat Treatment of Metals, 2016, 41(4): 154-157.
[11]曾宪波, 彭平. α₂-Ti-25Al-xNb合金力学性质的第一原理计算[J]. 金属学报, 2009, 45(9): 1049-1056.
Zeng Xianbo, Peng Ping. Calculation of mechanical properties of α₂-Ti-25Al-xNb alloys by first-principles[J]. Acta Metallurgica Sinica, 2009, 45(9): 1049-1056.
[12]丁立勇. 强约束条件下伞齿轮淬火工艺仿真及其变形控制[D]. 哈尔滨: 哈尔滨工业大学, 2012.
[13]Perdew J P, Burke K, Ernzerhof M. Generalized gradient approximation made simple[J]. Physical Review Letters, 1996, 77(18): 3865-3868.
[14]朱景川, 丁立勇, 刘勇, 等. 伞齿轮淬火变形的有限元模拟[J]. 黑龙江冶金, 2013, 33(1): 1-7.
Zhu Jingchuan, Ding Liyong, Liu Yong, et al. Numerical simulation of the molded quenching process of bevel gear and distortion minimization[J]. Metallurgy and Materials, 2013, 33(1): 1-7.
[15]Li Chonghe, Wu Ping. Empirical relation of melting temperatures of CsCl-type intermetallic compounds to their cohesive energies[J]. Chemistry Materials, 2002, 14(11): 4833-4836.
[16]Guinea F, Rose J H, Smith J R, et al. Scaling relations in the equation of state, thermal expansion, and melting of metals[J]. Applied Physics Letters, 1984, 44(1): 53-55.
[17]Segall M D, Shah R, Pickard C J, et al. Population analysis of plane-wave electronic structure calculations of bulk materials[J]. Physical Review B, 1996, 54(23): 16317-16320.