不同基体热浸镀铝镀层组织和高温磨损行为

doi:10.11868/j.issn.1001-4381.2014.001371

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摘要

选取45钢和H13钢进行热浸镀铝和高温扩散处理，采用X射线衍射（XRD）、扫描电镜（SEM）、能谱仪（EDS）等微观分析手段表征镀层物相、形貌和成分。采用销盘式高温磨损试验机对比研究不同基体下镀层的干滑动高温磨损行为，并探讨其磨损机制。结果表明：扩散层均以FeAl和Fe₃Al韧性相为主，两相之间界面周围存在平行于表面的Kikendall孔洞；镀层与45钢基体过渡平缓，结合良好，而与H13钢界面之间存在颗粒聚集，导致镀层与H13钢基体结合较差；45钢镀层在400℃/50~200N具有较好耐磨性，随环境温度升高，出现轻微-严重的磨损转变；H13钢镀层在400℃磨损率较低，在600℃也仅略高于400℃；Fe-Al镀层的磨损机制以氧化轻微磨损为主，45钢镀层在600℃出现塑性挤出磨损。

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	周德琴
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	王树奇

关键词 ：金属间化合物, 高温磨损, 热浸镀铝, 磨损行为, 磨损机制

Abstract：

The aluminized 45 and H13 steel were prepared via hot-dipped aluminizing and subsequently high-temperature diffusion treatment. The phase, morphology and composition of aluminized coating were characterized by XRD, SEM and EDS methods. Comparative study was performed on unlubricated sliding wear behavior of plating under different substrates on a pin-on-disc wear tester, and the wear mechanism was explored. The results show that the coating is composed of ductile phases FeAl and Fe₃Al. Kikendall porosity parallel to the surface exists around the interface of the two phases; because of the carbide particles agglomeration, the bond between the coating and H13 steel is apparently inferior to that in the case of 45 steel; the aluminized 45 steel possesses an excellent wear resistance under 50-200N at 400℃, whereas mild-to-severe wear transition occurs when the temperature increases to 600℃. The wear rate of the aluminized H13 steel reaches the lowest at 400℃, then slightly increases at 600℃. The wear mechanisms of Fe-Al coating are mainly predominated by oxidative mild wear, whereas the extrusion wear prevails in the process for aluminized 45 steel at 600℃.

Key words： intermetallic compound high-temperature wear hot-dipped aluminizing wear behavior wear mechanism

收稿日期: 2014-11-20 出版日期: 2018-02-01

中图分类号:

TH117

基金资助:国家自然科学基金资助项目(51071078);江苏省普通高校研究生科技创新项目资助(KYCX-1770);江苏省高端结构材料重点实验室开放基金资助项目(hsm1403)

通讯作者: 崔向红 E-mail: miracle8980@126.com

作者简介: 崔向红(1963-), 女, 副教授, 博士, 主要从事金属基复合材料及摩擦磨损方面的研究工作, 联系地址:江苏省镇江市学府路301号江苏大学材料科学与工程学院(212013), E-mail: miracle8980@126.com

引用本文:

周德琴, 陈伟, 张秋阳, 周银, 崔向红, 王树奇. 不同基体热浸镀铝镀层组织和高温磨损行为[J]. 材料工程, 2018, 46(2): 93-98.
De-qin ZHOU, Wei CHEN, Qiu-yang ZHANG, Yin ZHOU, Xiang-hong CUI, Shu-qi WANG. Microstructure and High-temperature Wear Behavior of Hot-dipped Aluminized Coating on Different Substrate Materials. Journal of Materials Engineering, 2018, 46(2): 93-98.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2014.001371 或 http://jme.biam.ac.cn/CN/Y2018/V46/I2/93

Table 1 基体材料的化学成分(质量分数/%)

Fig.1 热浸镀铝钢表面的XRD谱图
(a)45钢; (b)H13钢

Fig.2 45钢(a)和H13钢(b)热浸镀铝镀层剖面形貌

Table 2 45钢和H13钢基体及镀层的显微硬度

Fig.3 45钢和H13钢镀层在不同温度下的磨损率

Fig.4 45钢镀层磨面形貌
(a)400℃/150N;(b)400℃/250N;(c)600℃/50N;(d)600℃/100N

Fig.5 H13钢镀层磨面形貌
(a)400℃/150N;(b)400℃/300N;(c)600℃/50N;(d)600℃/300N

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