Ma Suyuan 

(Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016)

Chen Rui 

(Shenyang Institute of Casting Research, Shenyang 110021)

Wang Donglin  Li Jiabao

(Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016)

Hao Xuezhuo  Li Baodong

(Shenyang Institute of Casting Research, Shenyang 110021)

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

CLC No: TG142.23

国家自然科学基金资助项目(59971061). Received 20040515, received in revised form 20041221