磨削对不同温度回火钢铁材料微观结构的影响  

Influence of Grinding on Microstructure of Steel Tempered at Different Temperature

作　　者：马素媛[1] 徐建辉[1] 王东林[1] 李家宝[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳110016

出　　处：《材料热处理学报》2005年第2期47-50,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助 (59971 0 61 )

摘　　要：对淬火和不同温度回火处理的37SiMnCrNiMoV超高强度钢和6 0Si2Mn弹簧钢的电解抛光表面和磨削表面的X射线衍射线的半高宽和显微硬度进行测量,并通过线形分析得到了两种表面的亚晶粒尺寸和微观应变。结果表明,随着回火温度的升高,电解抛光表面的半高宽和显微硬度均逐渐减小。比起电解抛光表面,高温回火试样磨削表面的亚晶粒尺寸减小、微观应变增大,使得其半高宽和显微硬度都增大了,它说明磨削表面得到了加工硬化。而低温回火试样磨削表面的亚晶粒尺寸减小,但微观应变也减小了,其显微硬度增大,半高宽却减小了。2 0 0℃回火37SiMnCrNiMoV钢磨削表面的屈服强度比电解抛光表面的高出约4 0 0MPa。显微硬度和屈服强度的提高说明磨削也使低温回火试样磨削表面得到加工硬化,其微观应变和半高宽的减小是异常的。文中讨论了这种异常减小的机制。The half-width values of X-ray diffraction profile and microhardness on the electro-polished and ground surfaces of super high strength steel 37SiMnCrNiMoV and spring steel 60Si2Mn that were quenched and tempered at different temperature were measured. At the same time, the subgrain size and microstrain were calculated using X-ray diffraction profile analysis method. The results indicate that the higher the tempering temperature, the lower the half-width values and hardness on the electro-polished surface of two kinds of steel. Compared with that of electro-polished surface, the subgrain size on the ground surfaces of specimens tempered at higher temperature decreases, and the microstrain on these surfaces increases. As a result, the half-width values and microhardness of the ground surfaces increase, which illustrate that the ground surfaces are work hardened. However, when the tempering temperature is lower, grinding decreases not only the subgrain size but also microstrain of the specimen surfaces. These changes of microstructure make microhardness increased and half-width values decreased. Otherwise, the yield strength on the ground surface of steel 37SiMnCrNiMoV tempered at 200°C increases by 400 MPa. The increase of the microhardness and yield strength demonstrates the ground surfaces of the specimens tempered at lower temperature are work hardened, too. It is obvious that the decrease of the microstrain and half-width values are abnormal. The mechanism of the abnormal decrease is discussed.

关 键 词：磨削 显微硬度 半高宽 亚晶粒尺寸 微观应变 

分 类 号：TG142.1[一般工业技术—材料科学与工程]