球墨铸铁行走轮的低温正火工艺

doi:10.13251/j.issn.0254-6051.2022.09.017

摘要/Abstract

摘要： 对一种Cu微合金化球墨铸铁行走轮进行了低温正火工艺试验,获得了850 ℃和860 ℃正火后行走轮轮缘和轮辐的显微组织和力学性能数据。分析了合金元素Cu对球墨铸铁组织和性能的影响,以及对奥氏体化及珠光体形成相变温度区间带来的变化。结果表明,试验含Cu的球墨铸铁行走轮850 ℃正火就可以获得95%珠光体,达到完全正火的状态,力学性能符合QT650-4牌号的要求。比较了850 ℃和860 ℃正火后组织和性能,虽然都能满足要求,但860 ℃正火后表面硬度较850 ℃正火的高,机械切削性能相对较差。说明试验行走轮正火工艺温度窗口较窄,因此,选择850 ℃正火工艺为佳。该热处理工艺已在工程上得到应用,生产的行走轮已批量出口。

关键词: 行走轮, 球墨铸铁, 低温正火, 力学性能, 微合金化

Abstract: Low temperature normalizing process test of a kind of Cu microalloyed nodular cast iron travel wheel was carried out, and the microstructure and mechanical property data of the flange and spokes of the travel wheel normalized at 850 ℃ and 860 ℃ were obtained. The effect of alloying element Cu on microstructure and properties of nodular cast iron and the change of the temperature range of austenitization and pearlite transformation were analyzed. The results show that 95% pearlite of the nodular cast iron travel wheel can be obtained by normalizing at 850 ℃, reaching fully normalized state, and the mechanical properties meet the requirements of QT650-4 grade. Meanwhile, the microstructure and properties after normalizing at 850 ℃ and 860 ℃ are compared. Although the microstructure and properties after normalizing at 850 ℃ and 860 ℃ can meet the requirements, the surface hardness after normalizing at 860 ℃ is higher than that normalized at 850 ℃, and the mechanical cutting performance is relatively poor. It shows that the temperature window of this travel wheel normalizing process is very narrow. Therefore, it is better to choose the normalizing process at 850 ℃. The heat treatment process has been applied in engineering, and the produced travel wheels have been exported in batches.

Key words: travel wheel, nodular cast iron, low temperature normalizing, mechanical properties, microalloying

中图分类号:

TG164.2

肖结良, 孙浩, 李飞, 胡平, 陈旌钢, 江兆峰. 球墨铸铁行走轮的低温正火工艺[J]. 金属热处理, 2022, 47(9): 98-102.

Xiao Jieliang, Sun Hao, Li Fei, Hu Ping, Chen Jinggang, Jiang Zhaofeng. Low temperature normalizing process of nodular cast iron travel wheel[J]. Heat Treatment of Metals, 2022, 47(9): 98-102.

参考文献

[1]龚文邦, 白新社, 刘金城. 球墨铸铁的发展[J]. 现代铸铁, 2019, 39(4): 22-27, 45.
Gong Wenbang, Bai Xinshe, Liu Jincheng. Development of nodular iron[J]. Modern Cast Iron, 2019, 39(4): 22-27, 45.
[2]黄建洪. 奥-贝球铁研究与应用的进程[J]. 金属热处理, 2010, 35(11): 1-8.
Huang Jianhong. Research progress and application of austenite-bainite nodular-iron[J]. Heat Treatment of Metals, 2010, 35(11): 1-8.
[3]刘鹏, 甄立军, 王章明, 等. 球墨铸铁铸件铸造技术研究进展[J]. 中国铸造装备与技术, 2017(4): 1-6.
Liu Peng, Zhen Lijun, Wang Zhangming, et al. Research progress on casting technology of nodular cast iron casting[J]. China Foundry Machinery and Technology, 2017(4): 1-6.
[4]杨海峰, 周威佳, 赵洪运, 等. 一种球墨铸铁等温正火工艺[J]. 金属热处理, 2015, 40(7): 142-144.
Yang Haifeng, Zhou Weijia, Zhao Hongyun, et al. Isothermal normalizing process for a ductile iron[J]. Heat Treatment of Metals, 2015, 40(7): 142-144.
[5]潘健生. 关于热处理的思考[J]. 热处理, 2016, 31(1): 60-64.
Pan Jiansheng. Thoughts on heat treatment[J]. Heat Treatment, 2016, 31(1): 60-64.
[6]蒋漫文. 球墨铸铁低碳奥氏体化和部分奥氏体化热处理研究[J]. 江西冶金, 2003, 23(6): 102-104.
Jiang Manwen. The study of heat treatment for nodular iron of low carbon austenite conditioning and part austenite conditioning[J]. Jiangxi Metallurgy, 2003, 23(6): 102-104.
[7]周鼎华. 球墨铸铁的强韧化处理[J]. 热处理, 2013, 28(3): 12-18.
Zhou Dinghua. Strengthening and toughening for nodular iron[J]. Heat Treatment, 2013, 28(3): 12-18.
[8]朱先勇, 刘耀辉, 张英波, 等. 新型铸态高强度珠光体球墨铸铁的研究[J]. 材料热处理学报, 2007, 28(2): 85-88.
Zhu Xianyong, Liu Yaohui, Zhang Yingbo, et al. Study on as-cast high strength pearlite ductile iron[J]. Transactions of Materials and Heat Treatment, 2007, 28(2): 85-88.
[9]宋良. Cu对球墨铸铁组织和力学性能的影响[J]. 黑龙江科技大学学报, 2017, 27(6): 674-678.
Song Liang. Effect of Cu on microstructure and mechanical properties of ductile cast iron[J]. Journal of Heilongjiang University of Science and Technology, 2017, 27(6): 674-678.
[10]赵书城. 铜对球墨铸铁组织和性能的影响[J]. 现代铸铁, 2000(4): 13-15.
Zhao Shucheng. Effect of copper on nodular iron[J]. Modern Cast Iron, 2000(4): 13-15.
[11]马晓丽, 雷富军. 铜对铸态高强度球墨铸铁性能的影响[J]. 铸造, 2011, 60(12): 1245-1248.
Ma Xiaoli, Lei Fujun. Influence of Cu on properties of high strength ductile cast iron[J]. Foundry, 2011, 60(12): 1245-1248.
[12]刘宏. 铜-钛合金化球墨铸铁的研究与应用[J]. 机械工程材料, 2000, 24(4): 41-43.
Liu Hong. Research and application on Cu-Ti alloying ductile iron[J]. Materials for Mechanical Engineering, 2000, 24(4): 41-43.
[13]胡勇, 饶丽, 陈国香. Mn、Cu对球墨铸铁组织性能的影响[J]. 兵器材料科学与工程, 2012, 35(4): 5-7.
Hu Yong, Rao Li, Chen Guoxiang. Effects of Mn, Cu on the microstructures and mechanical properties of nodular cast iron[J]. Ordnance Material Science and Engineering, 2012, 35(4): 5-7.
[14]胡凤翔, 于艳丽. 工程材料及热处理[M]. 北京: 北京理工大学出版社, 2012: 168.
[15]杨佳荣. 球墨铸铁研究及应用展望[J]. 现代铸铁, 1999(2): 5-8.
Yang Jiarong. A review of the study and application of nodular cast iron[J]. Modern Cast Iron, 1999(2): 5-8.