摘要
借助X射线应力分析技术测量了屈服强度在马氏体不锈钢0Cr13Ni4Mo磨削影响层上的分布,同时测量或计算了残余应力、X射线衍射线半高宽、显微硬度、嵌镶块尺寸、微观应变和位错密度等参量的沿层深分布。结果表明,该影响层的屈服强度大幅度提高了,与用半高宽和显微硬度比较起来,用屈服强度作指标能够更好地反映磨削影响层的强化。磨削表面的条件屈服强度提高了约50%,嵌镶块尺寸从约64nm减小到约28nm,微观应变从约7×10-4增高至约14×10-4。磨削影响层的条件屈服强度σ0.2与位错密度的平方根之间存在线性关系。这些结果说明,磨削表面发生了严重的塑性形变。冷作塑性形变强化是磨削影响层的屈服强度得以提高的根本原因。
The depth distribution of yield strength in grinding affected layer of martensite stainless steel OCrl3Ni4Mo is measured by using X-ray stress analysis technique. Meanwhile, the depth distributions of other parameters, such as residual stress, half-width values of X-ray diffraction profile, micro-hardness, mosaic block size, microstrain and dislocation density, are measured or calculated. The experimental results indicate that the yield strength in such layer greatly increases. Compared to the half-width values and microhardness, the yield strength will be the better characteristic parameter used to reflect the strengthening in grinding affected layer. For the grinding surface the proof stress increases by about 50 percents, the mosaic block size decreases from about 64 nm to 28 nm, while the microstrain increases from 7 × 10-4 to 14×10-4 or so. The relation between the proof stress, σb.2, and the square root of dislocation density is linear. All these results show that severe plastic deformation occurred on the grinding surface, the strain strengthening is the basic reason for the increase of the yield strength in grinding affected layer.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2005年第6期25-29,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(59971061)。
关键词
X射线应力分析
磨削
屈服强度
显微硬度
位错密度
X-ray stress analysis Grinding Yield strength Microhardness Dislocation density
