Abstract: The depth distribution of yield strength in grinding affected layer of martensite stainless steel 0Cr13Ni4Mo 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, microhardness, 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 sur-face 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, s0.2, 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.

Key words: Dislocation density, Grinding, Microhardness, X-ray stress analysis, Yield strength