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对GH742高温合金进行激光冲击强化和喷丸强化,利用X射线应力分析仪测定强化层的残余应力,对比分析2种残余应力的差异和特征,并采用不同的退火温度进行退火,研究表面残余应力在高温下的稳定性。结果表明,2种表面强化方法都可以在GH742高温合金表层引入残余压应力,但激光冲击强化试样比喷丸强化试样具有更深的残余压应力层和较好的稳定性,且残余压应力最大值在表面;与激光冲击强化的试样相比,喷丸强化试样的残余压应力较浅,而且随着喷丸强度的增加,最大残余压应力也由表面移向了次表面。
The GH742 superalloy was subjected to laser shock peening and shot peening. The residual stress of the strengthened layer was measured by X-ray stress analyzer. The differences and characteristics of the two residual stresses were compared and analyzed. The annealing was carried out at different annealing temperatures to study the residual stress Stability at high temperatures. The results show that the two kinds of surface strengthening methods can introduce residual compressive stress on the GH742 superalloy surface, but the laser shocked specimen has deeper residual compressive stress layer and better stability than the shot peening specimen, and the residual compressive stress The maximum value is on the surface. Compared with the laser shock-enhanced sample, the residual compressive stress of the shot peening specimen is shallow, and the maximum residual compressive stress moves from the surface to the sub-surface as the shot-peening strength increases.