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采用100%和300%覆盖率喷丸方法对TC4钛合金表面进行强化,分析了表面覆盖率和热暴露温度对合金表面残余应力场和半高宽的影响。结果表明:喷丸后,较高的覆盖率可以提高残余压应力的数值、深度及半高宽数值;经过200℃×1 h热暴露后,覆盖率为100%和300%喷丸的钛合金表面残余应力场和半高宽分布基本一致,说明覆盖率偏高对于残余应力场的热稳定性有不利影响;经过500℃×1 h热暴露后,覆盖率为100%和300%喷丸的钛合金表面残余应力场均松弛殆尽,说明热暴露温度对残余应力具有重要影响,而表面层半高宽仍高于基体,说明喷丸产生的塑性形变强化效果仍可能存在。
The surface of TC4 titanium alloy was strengthened by shot peening with 100% and 300% coverage. The effects of surface coverage and heat exposure temperature on the residual stress field and FWHM of the alloy surface were analyzed. The results show that after shot peening, higher coverage can improve the numerical value, depth and FWHM of residual compressive stress. After 200 ℃ × 1 h thermal exposure, the titanium alloy with 100% coverage and 300% shot peening The surface residual stress field and the FWHM distribution are basically the same, indicating that the high coverage rate has an adverse effect on the thermal stability of the residual stress field. After 500 ℃ × 1 h thermal exposure, the coverage is 100% and 300% shot peening The residual stress field on the surface of titanium alloy relaxes completely, indicating that the thermal exposure temperature has an important influence on residual stress, while the FWHM of the surface layer is still higher than that of the matrix, indicating that the plastic deformation strengthening effect of shot peening may still exist.