Strain-induced precipitation was systematically investigated in austenitic Inconel 617B superalloy (IN617B) after deformation of 0.2 true strain in its service temperature range (700–850 °C). The precipitation-time-temperature (PTT) curves obtained by stress relaxation experiments showed a classic C-shape with the nose temperature of 800 °C, and a minimum incubation period of 30 s, and the main strain-induced precipitate was M₂₃C₆ carbide. After specimens deformed at 800 °C to a strain of 0.2 were held between 10 and 1000 s, they underwent a second-pass strain test, during which the M₂₃C₆ precipitates evolved and influenced the flow stress; this behavior was investigated. During the nucleation, growth, and coarsening of the strain-induced precipitates, the morphology of the M₂₃C₆ particles gradually changed from spherical to polygonal with increasing size, but the precipitates always maintained their cube-on-cube orientational relationship with the austenitic matrix. During the nucleation stage before 30 s, many pre-precipitation clusters and weak static recovery softening led to low second-deformation flow stress, which persisted at approximately 630 MPa. In the precipitation growth phase before 360 s, recovery softening balanced precipitation hardening. The strain-induced precipitates grew larger, and they were able to pin dislocations. In addition, some complex microstructures resulting from particle collisions were observed. This resulted in the maximum rate of increase of the second deformation flow stress, which quickly reached almost 700 MPa. When the holding time was extended to 1000 s, the recovery softening effect further increased, while the M₂₃C₆ particles gradually coarsened; this weakened the increasing trend of the second deformation flow stress, which increased to only 715 MPa at 1000 s

在奥氏体 Inconel 617B 高温合金 (IN617B) 在其使用温度范围 (700–850 °C) 变形 0.2 真应变后系统地研究了应变诱导析出。应力松弛实验得到的沉淀-时间-温度（PTT）曲线为经典的C形，鼻端温度为800℃，最短潜伏期为30s，主要应变诱导沉淀为M ₂₃ C ₆碳化物。试样在 800 °C 变形至 0.2 应变后保持 10 到 1000 秒，然后进行第二次应变测试，在此期间 M ₂₃ C ₆析出析出并影响流动应力；这种行为已被调查。在应变诱导析出物的形核、生长和粗化过程中，M ₂₃ C ₆随着尺寸的增加，颗粒逐渐从球形变为多边形，但沉淀物始终保持与奥氏体基体的立方对立方取向关系。在 30 s 之前的成核阶段，许多预沉淀团簇和弱静态恢复软化导致二次变形流动应力较低，持续在 630 MPa 左右。在 360 s 之前的沉淀生长阶段，恢复软化平衡了沉淀硬化。应变诱导的沉淀物变得更大，并且它们能够钉住位错。此外，还观察到一些由粒子碰撞引起的复杂微观结构。这导致第二次变形流变应力的最大增加率，很快达到近 700 MPa。当保持时间延长至 1000 s 时，₂₃ C ₆颗粒逐渐粗化；这削弱了第二变形流变应力的增加趋势，在 1000 s 时增加到仅 715 MPa