Effect of rolling treatment on wear resistance of reactor coolant pump sleeve
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摘要: 采用了滚压加工的方法强化核主泵轴套表面,研究滚压处理对马氏体不锈钢轴套耐磨性能的影响。采用EBSD系统、白光干涉仪、显微硬度计及摩擦磨损试验机分别对试样的晶粒度、粗糙度、显微硬度及摩擦系数进行表征。结果表明，基体表面粗糙度轮廓算术平均值Ra为383 nm，滚压层表面粗糙度表面轮廓算术的平均值Ra为63.7 nm，大概为基体的1/4～1/5；滚压层晶粒细化，小尺寸晶粒比例增大，在一定区域内占比由基体的62%左右增加到75%左右；基体显微硬度为260 HV，滚压层显微硬度达到550 HV，大概为基体硬度的2.2倍；滚压层的摩擦系数降低，摩擦系数曲线更加平缓，即表面光洁度降低。采用滚压加工后，零件的表面耐磨性显著提高。Abstract: In order to improve the surface wear resistance of Reactor Coolant Pump sleeve,the rolling machining was conducted on the surface of stainless steel,its wear resistance was studied.The grain size in the hardened layer were characterized with the EBSD system.Surface roughness,microhardness as well as the friction and wear properties of stainless steel were tested with white-light interferometer,microhardness tester and friction and wear tester.The results showed that Arithmetic mean of contour（Ra） of rolling layer is 63.7 nm,which is about 1/4 to 1/5 as that of substrate; The grain size of rolling layer is refined and the proportion of small grain size is increased; The surface microhardness of rolling layer is 550 HV,which is 2.2 times higher than that of substrate; The friction coefficient of rolled layer decreased.The changes of the above parameters improve the wear resistance of the shaft sleeve surface.
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Keywords:
- rolling /
- wear resistance /
- reactor coolant pump /
- sleeve
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