Second phase precipitation strengthening process of vacuum carburizing and quenching

doi:10.13251/j.issn.0254-6051.2023.05.036

Abstract

Abstract: Combining the second phase precipitation strengthening principle and adopting the process path based on the saturation value adjustment method, the vacuum carburizing and quenching process was developed with the help of calculation software, and the second phase strengthening carburizing and quenching process test was carried out on 18CrNiMo7-6 steel disc specimens and gears. The surface hardness, depth of hardened layer and microstructure of the disc and gear specimens were measured. The results show that the second phase strengthening carburizing process can cause precipitation of a large amount of dispersed fine and evenly distributed carbides in the carburized layer, which improves the surface hardness of the disc specimen to about 840 HV by second phase strengthening, and makes the high hardness layer deeper and resulting more ideal hardness-layer depth curve. Such kind of second phase strengthening carburizing and quenching process can be successfully applied to gear and other transmission parts to improve the surface hardness.

Key words: 18CrNiMo7-6 steel, gear, second phase precipitation strengthening, carburizing and quenching, carbide

CLC Number:

TG156.3

Lü Huyue, Chen Xuyang, Cong Peiwu, Lu Wenlin, Du Chunhui, Hu Fengjiao. Second phase precipitation strengthening process of vacuum carburizing and quenching[J]. Heat Treatment of Metals, 2023, 48(5): 236-240.

References

[1]汪正兵, 朱百智, 陈贺. 风电齿轮热处理技术现状和趋势[J]. 金属热处理, 2020, 45(1): 34-41.
Wang Zhengbing, Zhu Baizhi, Chen He. Situation and trend of heat treatment technology in wind power gear[J]. Heat Treatment of Metals, 2020, 45(1): 34-41.
[2]徐跃明, 李俏, 罗新民, 等. 热处理技术进展[J]. 金属热处理, 2015, 40(9): 1-15.
Xu Yueming, Li Qiao, Luo Xinmin, et al. Technology progress in heat treatment[J]. Heat Treatment of Metals, 2015, 40(9): 1-15.
[3]陈强, 陈林芳, 杨明华. 18CrNiMo7-6钢的可控气氛高温渗碳工艺[J]. 金属热处理, 2022, 47(4): 231-239.
Chen Qiang, Chen Linfang, Yang Minghua. High temperature carburizing process of 18CrNiMo7-6 steel in controlled atmosphere[J]. Heat Treatment of Metals, 2022, 47(4): 231-239.
[4]韩颢源, 张子博, 余万华, 等. 扩散时间对20MnCrS5齿轮钢真空渗碳的影响[J]. 金属热处理, 2022, 47(11): 138-142.
Han Haoyuan, Zhang Zibo, Yu Wanhua, et al. Effect of diffusion time on vacuum carburizing of 20MnCrS5 gear steel[J]. Heat Treatment of Metals, 2022, 47(11): 138-142.
[5]周武, 王敏, 赵同新, 等. 离子渗氮温度对Fe-C-Cr-Ni-Mn-V沉淀硬化型奥氏体不锈钢渗层组织和性能的影响[J]. 金属热处理, 2022, 47(11): 147-152.
Zhou Wu, Wang Min, Zhao Tongxin, et al. Effect of plasma nitriding temperature on the microstructure and properties of nitrided layer on Fe-Cr-Ni-Mn-V precipitation-hardened austenitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(11): 147-152.
[6]Hasegawa M, Takeshita K. Strengthening of steel by the method of spraying oxide particles into molten steel stream[J]. Metallurgical and Materials Transactions, 1978, 9(3): 383.
[7]李阳, 侯圣文, 贺尔康, 等. 20MnCr5齿轮钢渗碳层弥散碳化物形成机理[J]. 金属热处理, 2022, 47(12): 196-200.
Li Yang, Hou Shengwen, He Erkang, et al. Formation mechanism of dispersed carbide in carburized layer of 20MnCr5 gear steel[J]. Heat Treatment of Metals, 2022, 47(12): 196-200.
[8]石巨岩, 于静, 田晓青, 等. 20CrMnTi钢超饱和渗碳工艺的研究[J]. 热加工工艺, 2010, 39(12): 147-149.
Shi Juyan, Yu Jing, Tian Xiaoqing, et al. Study on supersaturated carburizing process of 20CrMnTi steel[J]. Hot Working Technology, 2010, 39(12): 147-149.
[9]于忠江, 王殿梁, 刘杨, 等. H13钢碳化物析出型渗碳(CDC)处理[J]. 材料与冶金学报, 2002(4): 311-316.
Yu Zhongjiang, Wang Dianliang, Liu Yang, et al. Carbide dispersion carburizing of steel H13[J]. Journal of Materials and Metallurgy, 2002(4): 311-316.
[10]孟献民. 渗碳层高温碳化物的形成机理和获得弥散细小的颗粒状碳化物的工艺方法[J]. 热加工工艺, 1986(1): 59-62.
[11]张明皓, 韩颢源, 徐跃明, 等. 真空渗碳18CrNiMo7-6钢中碳化物的析出规律[J]. 金属热处理, 2022, 47(5): 171-176.
Zhang Minghao, Han Haoyuan, Xu Yueming, et al. Carbide precipitation law in vacuum carburized 18CrNiMo7-6 steel[J]. Heat Treatment of Metals, 2022, 47(5): 171-176.
[12]王硕彬, 丛培武, 陈旭阳, 等. 20CrMoH钢的真空低压渗碳工艺模拟及优化[J]. 金属热处理, 2022, 47(5): 189-193.
Wang Shuobin, Cong Peiwu, Chen Xuyang, et al. Simulation and optimization of vacuum low pressure carburizing process of 20CrMoH steel[J]. Heat Treatment of Metals, 2022, 47(5): 189-193.
[13]陈旭阳, 丛培武, 范雷, 等. 基于饱和值调整法的真空低压渗碳工艺计算与验证[J]. 金属热处理, 2020, 45(9): 233-236.
Chen Xuyang, Cong Peiwu, Fan Lei, et al. Calculation and verification of vacuum low pressure carburizing process based on saturation value adjustment method[J]. Heat Treatment of Metals, 2020, 45(9): 233-236.

[1]	Shu Ruixi, Yang Zhongmin, Cao Yanguang, Li Zhaodong, Chen Ying, Wang Huimin. Effect of rare earth Y on microstructure and properties of H13 steel [J]. Heat Treatment of Metals, 2023, 48(5): 70-77.
[2]	Chen Jianwen, Yuan Wufeng, Zou Wei, Liu Ke, Ouyang Xuemei, Wang Xinming. Temperature field simulation of pressure quenching process of 20Cr2Ni4A steel ring gear [J]. Heat Treatment of Metals, 2023, 48(5): 145-150.
[3]	Liu Shuai, Wang Fuming, Xu Hailun, Liu Shaowei. Effects of hot deformation behavior and dynamic recrystallization on MnS inclusions in low sulfur gear steel [J]. Heat Treatment of Metals, 2023, 48(5): 217-223.
[4]	Wang Bohui, Xu Taixu, Lu Ming, He Zhijun. Carbide evolution of GCr15SiMo bearing steel during spheroidizing annealing process [J]. Heat Treatment of Metals, 2023, 48(4): 60-66.
[5]	Xie Gangsheng, Xing Shuqing, Shen Lijuan, Ma Yonglin, Liu Yongzhen, Chen Zhongyi. Effect of pulsed magnetic field on precipitation of carbides during spheroidizing annealing of GCr15 steel [J]. Heat Treatment of Metals, 2023, 48(4): 118-122.
[6]	Liu Jinde, Lu Junling, Wang Liang, Ma Tao, Ma Chunliang, Sun Yongpeng. Influence of second tempering on fatigue cycle number of mining link made of 23MnNiCrMo54 steel [J]. Heat Treatment of Metals, 2023, 48(4): 137-142.
[7]	Chen Zhi, Li Baokui, Lu Jinsheng, Xu Hongxiang, Zhang Heng. Application and progress of nitriding treatment in heavy duty gears [J]. Heat Treatment of Metals, 2023, 48(3): 104-111.
[8]	Zhao Jinzhu, Xie Zhifeng, Wei Hong. A heat treatment process for improving carbide morphology of wear resistant high manganese steel [J]. Heat Treatment of Metals, 2023, 48(3): 139-142.
[9]	Cui Yi, Zhang Caidong, Yu Feng, Zhang Yunfei, Zhang Zhiwang, Cao Wenquan, Zhao Yingli, Cui Shaopu. Influence of large carbides on rotating bending fatigue of GCr4Mo4V steel [J]. Heat Treatment of Metals, 2023, 48(2): 50-55.
[10]	Xie Yikui, Wang Qicheng, Chen Zikun, Wu Xiaodong, Wang Zhongying. Hot deformation behavior and microstructure evolution of 18CrNiMo7-6 gear steel [J]. Heat Treatment of Metals, 2023, 48(2): 103-109.
[11]	Hao Xiaoge, Zhao Leijie, Wang Yanhui, Ma Penghui, Zhang Zi, Yue Yun, Xiong Peng. Microstructure and properties of bainitic alloy steels with different carbon contents after austempering [J]. Heat Treatment of Metals, 2023, 48(1): 46-51.
[12]	Zhang Xiaolu, Hai Xianü, Gui Weimin, Yu Wenchao, Shi Jie, Wang Maoqiu. Fatigue properties and influencing factors of carburized gear steel 18CrNiMo7-6 [J]. Heat Treatment of Metals, 2023, 48(1): 60-67.
[13]	Dai Jianke, Han Shun, Li Yong, Liu Yu, Lei Simin, Wang Chunxu. Effect of quenching temperature on microstructure and mechanical properties of new gear steel [J]. Heat Treatment of Metals, 2023, 48(1): 163-168.
[14]	Cheng Ru, Tian Yong, Song Chaowei, Wang Haojie. Effect of vacuum low pressure carburizing on microstructure and properties of austenitic stainless steels 304 and 316L [J]. Heat Treatment of Metals, 2022, 47(9): 1-5.
[15]	Wen Fangming, Hao Xiaobo, Cao Heng, Zhang Qiang, Li Bobo, Liu Yinqi. Effect of heat treatment process on microstructure and mechanical properties of N06600 alloy hot rolled plate [J]. Heat Treatment of Metals, 2022, 47(9): 113-118.