【摘要】 粉末高温合金涡轮盘由于长期在高温高应力等极端环境下服役，通常需对其表面进行喷丸强化处理，以满足严苛的性能需求。基于此，本文系统研究了不同喷丸强度对镍基粉末合金FGH96的表面完整性的影响。结果表明，经喷丸处理后，合金近表层晶粒发生细化，产生了一层硬化层，并在表层引入了较大的残余压应力。此外，在合金近表面产生了塑性变形层，其深度随喷丸强度增加而增加，由原始状态下的5μm增加到0.25 mmA喷丸强度下的117μm。随喷丸强度的增加，合金的表面粗糙度、表面硬度值、硬化层深度、表层残余压应力和残余应力层深均呈增加趋势。该研究结果可为粉末高温合金喷丸强化工艺的设计和选取提供一定的数据基础。更多还原

【Abstract】 Due to the long-term service in extreme environments such as high temperature and high stress, the surfaces of nickel-based powder superalloy turbine disk usually needs to be shot peened to meet its stringent performance requirements. Based on this, this paper systematically investigates the effect of different shot peening intensities on the surface integrity of nickel-based powder alloy FGH96. The results show that after shot peening, grain refinement occurs in the near-surface layer of the alloy, producing a hardened layer and introducing large residual compressive stresses in the surface layer. In addition, a plastic deformation layer was produced near the surface, the depth of which deepened with the increase of shot peening intensity from 5 μm in the original state to 117 μm at a shot peening intensity of 0.25 mmA. With the increase of shot peening intensity, the alloy’s surface roughness, surface hardness value, depth of the hardened layer, residual compressive stresses in the surface layer, and the depth of the residual stresses layer all showed an increasing trend. The results of this study can provide some data reference for the design and selection of the shot peening process of powder metallurgy superalloys.更多还原