Aging behavior of Haynes® 282® wrought nickel superalloy subjected to a cold pre-deformation by differential speed rolling.
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| Title: | Aging behavior of Haynes® 282® wrought nickel superalloy subjected to a cold pre-deformation by differential speed rolling. |
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| Authors: | Polkowski, Wojciech1 (AUTHOR) wojciech.polkowski@kit.lukasiewicz.gov.pl, Polkowska, Adelajda1 (AUTHOR) adelajda.polkowska@kit.lukasiewicz.gov.pl, Lech, Sebastian1,2 (AUTHOR) slech@agh.edu.pl |
| Source: | Journal of Alloys & Compounds. Apr2021, Vol. 860, pN.PAG-N.PAG. 1p. |
| Subjects: | Heat resistant alloys, Heat treatment, Shear strain, Transmission electron microscopy, Nickel |
| Abstract: | • Two-pass Differential Speed Rolling (DSR) of Haynes®282® Ni superalloy. • The effect of different cold pre-straining on aging behavior of Ni superalloy. • SEM/EBSD and TEM studies on structure and crystallographic texture. • Improvement of mechanical strength of fully heat-treated alloy by DSR pre-straining. 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% nominal cold thickness reduction by either ESR or DSR methods, followed by a two-step heat treatment at 1010 °C/2 h and 780 °C/8 h. The material's 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 an (I) more efficient strain-hardening of the alloy in the as-deformed state and (II) 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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