论文标题
海恩斯282锻造镍超合金的衰老行为，通过差速滚动经过冷的预求。
Aging behavior of Haynes 282 wrought nickel superalloy subjected to a cold pre-deformation by differential speed rolling
论文作者
论文摘要
Haynes 282的机械响应是一种锻造的伽玛素基镍基于镍的超合金，是通过使用冷变形处理和包括两步衰老的后加热处理后量身定制的。在这项工作中，首次检查了常规速度滚动ESR或差异速度滚动DSR方法对Haynes 282 Superaly的衰老行为的施加冷前变形的影响。因此，实心溶液退火合金持续了50 pCT。 ESR或DSR方法的标称冷厚度减小，然后在1010C下进行2H和780C的两步热处理，为8H。通过使用扫描电子显微镜，电子反向衍射和透射电子显微镜方法来表征每个处理步骤上的材料结构演化。在非标准微型化标本进行的静态拉伸测试中检查了相应的机械性能。已经发现，在冷滚动过程中，通过滚动速度分化引入剪切应变会导致合金在变形状态下的合金更有效的应变硬化，并在变形后退火后进行大量的谷物细化。因此，与非变形和常规冷滚动的对应物相比，DSR提供了在两个老化步骤中获得的更高的室温机械强度。此外，注意到在ESRED或DSRED和热处理合金的晶体学取向方面的稳定性方面存在明显的差异。
The mechanical response of Haynes 282, a wrought gamma prime strengthened nickel based superalloy, is tailored by using both a cold deformation processing and a post straining heat treatment including a two step aging. In this work, the effect of the applied cold pre deformation by conventional equal speed rolling ESR or differential speed rolling DSR methods on the aging behavior of Haynes 282 superalloy, is examined for the first time. For this reason, the solid solution annealed alloy was subjected to 50 pct. nominal cold thickness reduction by either ESR or DSR methods, followed by a two step heat treatment at 1010C for 2h and 780C for 8h. The material structural evolution on each processing step was characterized by using scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy methods. Corresponding mechanical properties were examined in static tensile tests performed on non standard miniaturized specimens. It was found that, the introduction of a shear strain by rolls speed differentiation in the cold rolling process results in a more efficient strain hardening of the alloy in the as deformed state and an intensive grain refinement upon the post deformation annealing. Consequently, the DSR provides a higher room temperature mechanical strength obtained in both aging steps, as compared to the non deformed and conventionally cold rolled counterparts. Furthermore, noticeable differences in terms of stability of crystallographic orientations for ESRed or DSRed and heat treated alloy, were noted.
