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贝氏体在等温淬火球墨铸铁磨损和摩擦行为中的作用

The Role of Bainite in Wear and Friction Behavior of Austempered Ductile Iron.

作者信息

Wen Fulin, Zhao Jianhua, Zheng Dengzhi, He Ke, Ye Wei, Qu Shen, Shangguan Jingjing

机构信息

State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.

National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China.

出版信息

Materials (Basel). 2019 Mar 6;12(5):767. doi: 10.3390/ma12050767.

DOI:10.3390/ma12050767
PMID:30845679
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6427141/
Abstract

The austempered ductile iron was austenitized at 900 °C for 1 h and quenched in an isothermal quenching furnace at 380 °C and 280 °C, respectively. This paper aims to investigate the effects of bainite on wear resistance of austempered ductile iron (ADI) at different loads conditions. The micro-structure and phase composition of ADI was characterized and analyzed by metallographic microscope (OM), X-ray diffractometer (XRD) and scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). The results showed that the volume fraction of retained austenite in ADI is reduced with the increase of austenitizing temperature. Meanwhile, the two kinds of ADI samples showed varied wear resistance when they were worn at different loads conditions. For wearing at a load of 25 N, the wear resistance of ADI mainly depends on matrix micro-hardness. Thus, ADI with lower bainite structure has higher hardness and leads to better wear resistance. When wearing at a load of 100 N, the increase of micro-hardness of upper bainite was significant. As a consequence, upper bainite showed superior friction and wear behavior. It was also found that the form of wear behavior of ADI changed from abrasive wear to fatigue delamination as the wear load increased from 25 N to 100 N according to the observation on worn surface.

摘要

将等温淬火球墨铸铁在900℃下奥氏体化1小时，然后分别在380℃和280℃的等温淬火炉中淬火。本文旨在研究贝氏体对不同载荷条件下等温淬火球墨铸铁（ADI）耐磨性的影响。采用金相显微镜（OM）、X射线衍射仪（XRD）和带有能谱仪（EDS）的扫描电子显微镜（SEM）对ADI的微观结构和相组成进行了表征和分析。结果表明，随着奥氏体化温度的升高，ADI中残余奥氏体的体积分数降低。同时，两种ADI样品在不同载荷条件下磨损时表现出不同的耐磨性。在25N载荷下磨损时，ADI的耐磨性主要取决于基体显微硬度。因此，具有下贝氏体组织的ADI硬度较高，耐磨性较好。在100N载荷下磨损时，上贝氏体的显微硬度显著增加。因此，上贝氏体表现出优异的摩擦磨损性能。根据磨损表面观察还发现，随着磨损载荷从25N增加到100N，ADI的磨损行为形式从磨粒磨损转变为疲劳分层。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/0711a4bd657c/materials-12-00767-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/646f8f311639/materials-12-00767-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/34305fb942ed/materials-12-00767-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/e30fa40fd5f8/materials-12-00767-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/03d232b0f8bb/materials-12-00767-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/716db0bb13d9/materials-12-00767-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/b23caa605d9a/materials-12-00767-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/5136b7460fc1/materials-12-00767-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/8779418f0a31/materials-12-00767-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/0711a4bd657c/materials-12-00767-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/646f8f311639/materials-12-00767-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/34305fb942ed/materials-12-00767-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/e30fa40fd5f8/materials-12-00767-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/03d232b0f8bb/materials-12-00767-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/716db0bb13d9/materials-12-00767-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/b23caa605d9a/materials-12-00767-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/5136b7460fc1/materials-12-00767-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/8779418f0a31/materials-12-00767-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c98c/6427141/0711a4bd657c/materials-12-00767-g009.jpg

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