本文以渗碳热处理后的M50NiL钢为研究对象, 利用Vickers硬度计、XRD, TEM, HRTEM以及旋转弯曲疲劳试验仪对普通磨削和精密磨削后试样表面变质层微观结构和硬度及试样的疲劳性能进行了研究. 结果表明: 进刀量不同的2种磨削工艺获得的试样表面粗糙度不同, 表面变质层微观结构和硬度以及试样疲劳性能差别较大. 精密磨削对试样硬度产生影响的深度较小. 普通磨削表面变质层奥氏体含量较多, 呈现明显的奥氏体“有效晶粒”现象;精密磨削表面变质层则为非常细小的变形马氏体组织, 呈现明显的纳米级 马氏体“有效晶粒”现象; “有效晶粒”之间无明显的界面, 且晶面扭转现象明显,相邻“有效晶粒”之间转动角度最大可达14°, 同时“有效晶粒”内部晶面 也存在轻微扭转现象; 精密磨削工艺试样的旋转弯曲疲劳寿命约为普通磨削的13倍.
The surface hardness field, modificative layer microstructure and fatigue properties of carburized M50NiL steel after ordinary grinding and precision grinding, were studied using Vickers hardness tester, XRD, TEM, HRTEM and the rotating bending fatigue tester. The results showed that two grinding processes are different only on the amount of feed and surface roughness, but bring larger changes in the surface hardness field, modificative layer microstructure and fatigue properties. Two kinds of grinding have different effects on the hardness depth, the impact depth of precision grinding is smaller; There was more austenite on ordinary grinding surface, and the surface layer showed a clear modificative layer of austenitic "effective grain"; precision grinding surface modificative layer is very small deformation nano–martensite, but also shows a clear "effective grain" phenomenon; effective grain no obvious interface; "effective grain" turning phenomenon is apparent, adjacent "effective grain" rotation angle is up to 14?, while, there are slight turning phenomenon within the "effective grain"; rotating bending fatigue life of precision grinding increases by about 13 times of ordinary grinding sample.
[1] Ma S Y, Xu J H, He X C, Tan M, Li J B. Acta Metall Sin, 2003; 39: 168
(马素媛, 徐建辉, 贺笑春, 覃明, 李家宝. 金属学报, 2003; 39: 168)
[2] Yang Y Y, Fang H S, Huang W G. Tribol Int, 1996; 29: 425
[3] Gao C Q. Friction Metallography. Harbin: Harbin Institute of Technology Press, 1988: 32
(高彩桥. 摩擦金属学. 哈尔滨: 哈尔滨工业大学出版社, 1988: 32)
[4] Wang C J, Lu D Q, Wu J X. Carburizing Bearing Steel and Heat Treatment. Beijing: Ordnance Industry Press, 1989: 51
(汪传稷, 陆大启, 吴继贤. 渗碳轴承用钢及其热处理. 北京: 兵器工业出版社, 1989: 51)
[5] Fu Y F, Cui L J, L iu Y L, Yan Y J. Heavy Machin Sci Technol, 2003; 4: 37
(付云峰, 崔连进, 刘雅琳, 严衍军. 重型机械科技, 2003; 4: 37)
[6] Boehmer H J, Ebert F J, Trojahn W. Lubr Eng, 1992; 48: 28
[7] Rosado L, Jain V K, Trivedi H K. Wear, 1997; 212: 19
[8] Pearson P K, Dickinson T W. in: Hoo J J C ed., Effect of Steel Manufacturing Processes on the Quality of Bearing Steels, ASTM STP 987, Philadelphia, PA: American
society for testing and materials, 1988: 113
[9] Xia G Z. China Aeronautical Materials Handbook, Beijing: China Standard Press, 1988: 20
(夏恭枕. 中国航空材料手册. 北京: 中国标准出版社, 1988: 20)
[10] B¨ohmer H J. in: Hoo J J C ed., Creative Use of Bearing Steels, ASTM STP 1195, Philadelphia, PA: American society for testing and materials, 1993: 34
[11] Boehmer H J, Ebert F J, Trojahn W. J Soc Tribol Lubr Eng, 1992; 48: 28
[12] Braza J F, Pearson P K. in: Hoo J J C ed., Creative Use of Bearing Steels, ASTM STP 1195, Philadelphia, PA: American society for testing and materials, 1993: 49
[13] Fu Y Q, Gu Y W, Batchelor A W, Zhou W. Mater Sci Technol, 1998; 14: 461
[14] Harris T A, Skiller J, Spitzer R F. Tribol Trans, 1992, 35: 731
[15] Liu J D, Wang G C, Chen K M, Xu Z L, Hou D P. Met Heat Treat, 2006; 31: 57
(刘菊东, 王贵成, 陈康敏, 许志龙, 侯达盘. 金属热处理, 2006; 31: 57)
