Effect of normalizing temperature on microstructure and mechanical properties of 36MnVS4 and 46MnVS5 steels for fracture splitting connecting rod

doi:10.13251/j.issn.0254-6051.2024.07.038

Abstract

Abstract: Mechanical properties and microstructure evolution of two medium carbon non-quenched and tempered steels 36MnVS4 and 46MnVS5 widely used for automotive fracture splitting connecting rod at different normalizing temperatures were compared and studied, and the strengthening mechanism was analyzed. The results show that with the increase of normalizing temperature, the yield strength, tensile strength and hardness of both the 36MnVS4 and 46MnVS5 steels increase gradually, and the tensile strength and hardness of the 46MnVS5 steel are higher than those of the 36MnVS4 steel. When normalized below 990 ℃, the yield strength of the 46MnVS5 steel is higher than that of the 36MnVS4 steel, while normalized above 990 ℃, the yield strength of the 46MnVS5 steel is lower. When normalized above 1140 ℃, the elongation and percentage reduction of area of the 36MnVS4 steel are higher than that of the 46MnVS5 steel, and the toughness is better. The difference in mechanical properties between the two steels is mainly due to both the content of proeutectoid ferrite and the precipitated strengthening phase V(C, N) in proeutectoid ferrite after normalizing at 1200 ℃ of the 36MnVS4 steel are more than that in 46MnVS5 steel, so the plasticity of 36MnVS4 steel is better. However, considering the production process and properties requirements of the fracture splitting connecting rod, the improvement of toughness is unfavorable to the fracture splitting processing of the connecting rod, and the 46MnVS5 steel has good comprehensive mechanical properties and more cost advantages than the 36MnVS4 steel. Therefore, the 46MnVS5 steel is better to be selected for the fracture splitting connecting rod.

Key words: fracture splitting connecting rod, 36MnVS4 steel, 46MnVS5 steel, normalizing temperature, mechanical properties, proeutectoid ferrite

CLC Number:

TG142.1

Lu Mingxia, Zhang Lei, Wang Xinshe. Effect of normalizing temperature on microstructure and mechanical properties of 36MnVS4 and 46MnVS5 steels for fracture splitting connecting rod[J]. Heat Treatment of Metals, 2024, 49(7): 249-253.

References

[1]刘赞丰, 张传友, 王冠. 汽车发动机胀断连杆用中碳非调质钢46MnVS5的应用现状与发展[J]. 汽车工艺与材料, 2022(1): 38-42.
Liu Zanfeng, Zhang Chuanyou, Wang Guan. Application status and development of medium carbon non quenched and tempered steel 46MnVS5 for automobile engine fracture splitting connecting rod[J]. Automobile Technology and Material, 2022(1): 38-42.
[2]常开地, 王萍, 刘卫萍. 非调质钢的发展现状和应用进展[J]. 金属热处理, 2011, 36(3): 80-85.
Chang Kaidi, Wang Ping, Liu Weiping. Development status and application prospect of non-quenched tempered steel[J]. Heat Treatment of Metals, 2011, 36(3): 80-85.
[3]韩常海, 王志利, 施进卿. 胀断连杆用非调质钢C70S6BY产品研发[J]. 特殊钢, 2021, 42(6): 55-57.
Han Changhai, Wang Zhili, Shi Jinqing. Research and development of non-quenched-tempered steel C70S6BY for expanding fracture connecting rod[J]. Special Steel, 2021, 42(6): 55-57.
[4]李晓辉. 中碳非调质连杆胀断缺陷与Nb微合金化研究[D]. 西宁: 青海大学, 2018
[5]李鹏. 国外汽车发动机连杆材料最新应用[J]. 汽车工艺与材料, 2010(1): 42-45.
[6]Liu J, Kou S, He D. Comparative analysis of the fracture splitting deformation of the big end for C70S6, 36MnVS4 and 46MnVS5 connecting rods[J]. IOP Conference Series: Materials Science and Engineering, 2020, 772(1): 012113.
[7]刘瑞宁, 王福明. 汽车用微合金化非调质钢的进展[J]. 特殊钢, 2006, 27(3): 39-43.
Liu Ruining, Wang Fuming. Advance in microalloying non-quenched-tempered steels for auto[J]. Special Steel, 2006, 27(3): 39-43.
[8]巫宇峰, 惠卫军, 陈思联, 等. 钒对中碳非调质钢组织性能的影响[J]. 钢铁研究学报, 2016, 28(11): 56-62, 73.
Wu Yufeng, Hui Weijun, Chen Silian, et al. Influence of vanadium on microstructure and mechanical properties of medium carbon forging steel[J]. Journal of Iron and Steel Research, 2016, 28(11): 56-62, 73.
[9]巩清华. 胀断连杆锻造工艺解析[J]. 锻造与冲压, 2016(23): 55-57.
[10]刘智雄. 胀断连杆用新型中碳非调质钢的研究[D]. 昆明: 昆明理工大学, 2010.
[11]李晓辉, 张朝磊, 李戬, 等. 国产非调质钢36MnVS4连杆胀断缺陷分析[J]. 塑性工程学报, 2018, 25(1): 151-155.
Li Xiaohui, Zhang Chaolei, Li Jian, et al. Analysis for fracture splitting defect of domestic ail-cooled forging steel 36MnVS4 connecting rod[J]. Journal of Plasticity Engineering, 2018, 25(1): 151-155.

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