磨削用量对球墨铸铁QT400磨削淬硬层及其均匀性的影响

doi:10.13251/j.issn.0254-6051.2022.03.037

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 198-203.DOI: 10.13251/j.issn.0254-6051.2022.03.037

磨削用量对球墨铸铁QT400磨削淬硬层及其均匀性的影响

赵晓峰¹, 刘菊东¹, 黄松伟²

1.集美大学海洋装备与机械工程学院, 福建厦门 361021;
2.集美大学工程训练中心, 福建厦门 361021

收稿日期:2021-11-20 修回日期:2022-01-29 出版日期:2022-03-25 发布日期:2022-04-22
通讯作者: 刘菊东,教授,博士,E-mail:liujd2006@163.com
作者简介:赵晓峰(1992—),男,硕士研究生,主要研究方向为磨削淬硬加工技术,E-mail:1101507157@qq.com。
基金资助:
国家自然科学基金(51676085);福建省自然科学基金(2014J01199)

Effect of grinding parameter on grinding-hardened case and its uniformity of nodular cast iron QT400

Zhao Xiaofeng¹, Liu Judong¹, Huang Songwei²

1. College of Marine Equipment and Mechanical Engineering, Jimei University, Xiamen Fujian 361021, China;
2. Engineering Training Center, Jimei University, Xiamen Fujian 361021, China

Received:2021-11-20 Revised:2022-01-29 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 采用逆磨+顺磨的双程平面磨削方式对球墨铸铁QT400进行磨削淬硬试验,研究了磨削深度a_p和试样进给速度v_w对淬硬层及其均匀性的影响。结果表明,磨削后试样表层存在熔化、完全相变淬硬和未完全相变淬硬等3种情况,其中,熔化层组织为二次渗碳体、残留奥氏体和碳化物,完全相变淬硬层组织为针状马氏体、残留奥氏体和球状石墨,未完全淬硬层组织为针状马氏体、铁素体、残留奥氏体和球状石墨。显微硬度分布曲线中高硬度区的平均硬度值在850~950 HV0.2之间,与基体(190~230 HV0.2)相比,显微硬度提高近3倍。随着磨削深度a_p的增大或试样进给速度v_w的减小,试样表层呈现“完全未淬硬→未完全淬硬→完全淬硬→熔化”的变化规律,显微硬度分布曲线中高硬度区的范围也变宽,淬硬层的深度也增大且均匀性良好。

关键词: 磨削用量, 磨削淬硬, 球墨铸铁QT400, 淬硬层, 均匀性

Abstract: Grinding-hardening was done on nodular cast iron QT400 by using two-passes grinding up-grinding+down-grinding on a surface grinder. The influence of depth of cut a_p and table speed v_w on grinding-hardened case and its uniformity was studied.The results show that there are three case of the hardened surface of the specimen, which are melted layer, completely hardened case and incompletely hardened case. Among them, the structure of the melted layer is secondary cementte, retained austenite and carbides. The microstructure of the complete transformation hardened case is acicular martensite, retained austenite and spheroidal graphite, and the structure of the incompletely hardened case is acicular martensite, ferrite, retained austenite and spheroidal graphite.The average value of the high hardness region in the microhardness distribution curve is between 850-950 HV0.2. Compared with the matrix (190-230 HV0.2), the microhardness is increased by nearly 3 times. With the increase of grinding depth a_p or the decrease of feed speed v_w, the surface layer of the specimen shows the changing order of "completely unhardened→incompletely hardened→completely hardened→melted", the range of the high hardness region in the microhardness distribution curve also becomes wider, the depth of the grinding-hardened case is also increased and the uniformity is better.

Key words: grinding parameter, grind-hardening, nodular cast iron QT400, hardened case, uniformity

中图分类号:

TG156

赵晓峰, 刘菊东, 黄松伟. 磨削用量对球墨铸铁QT400磨削淬硬层及其均匀性的影响[J]. 金属热处理, 2022, 47(3): 198-203.

Zhao Xiaofeng, Liu Judong, Huang Songwei. Effect of grinding parameter on grinding-hardened case and its uniformity of nodular cast iron QT400[J]. Heat Treatment of Metals, 2022, 47(3): 198-203.

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磨削用量对球墨铸铁QT400磨削淬硬层及其均匀性的影响

Effect of grinding parameter on grinding-hardened case and its uniformity of nodular cast iron QT400

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