| 摘要: |
| 利用光学显微镜（OM）、透射电子显微镜(TEM)、X射线衍射(XRD)等手段，对滚动接触疲劳前后Cr5型支承辊用钢的表层组织演变进行了研究。结果表明：经940 ℃保温2 h淬火+450 ℃保温4 h回火处理后，Cr5型支承辊用钢的热处理组织由回火马氏体+残余奥氏体+球型碳化物组成。接触疲劳过程中片状马氏体组织发生细化，碳化物由球型转变成杆状，在接触疲劳循环应力作用下发生应变诱发马氏体相变，接触前后试样表层的残余奥氏体含量由6.4%下降到0.8%。 |
| 关键词: 接触疲劳 支承辊 显微组织 杆状碳化物 |
| DOI： |
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| 基金项目:国家冷轧板带装备及工艺工程技术研究中心开放课题(NECSR201207)； 河北省科技支撑计划项目(07212109D) |
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| Investigation of Surface Microstructure of Backup Rolls Steel Under Contact Fatigue |
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WANG Yu-hui, LIU Li-gang, CAI Da-yong, XIAO Fu-ren, YANG Qing-xiang, LIAO Bo
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a. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, b. National Key Laboratory of Metastable Materials Science & Technology, College of Material Science and Engineering, Yanshan University, Qinhuangdao 066004, Hebei
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| Abstract: |
| The microstructure evolution of Cr5type backup roll steel used for backup roller has been investigated before and after the fatigue test by using optical microscopy (OM), transmission electron microscopy (TEM) and Xray diffraction (XRD). Results show that the microstructure is composed of tempered martensitic, retained austenite and carbides after the heat treatment process of quenched after solution at 940 ℃ for 2 h, then tempered at 450 ℃ for 4 h. The contact fatigue process leads to finer martensitic microstructure and the shape of carbides from spherical transform to bacilliform. The behavior of strain induced martensite occurs and the content of retained austenite decreases from 6.4% to 0.8% after the fatigue test. |
| Key words: contact fatigue backup roller microstructure bacilliform carbide |
