Enhanced Mechanical Properties and Formability of Cross-Roll Rolled Ni–10Cr Alloy

抄録

This study evaluated the microstructure and enhancement of the mechanical properties of a cross-roll rolled Ni–10Cr alloy, as compared to a conventionally rolled material. A thickness reduction of 90% was achieved by cold rolling the alloy, which was subsequently annealed at 700°C for 30 min to obtain the fully recrystallized microstructure. In particular, cross roll rolling (CRR) was carried out with a roll mill tilted at a 5° from the transverse direction in the RD–TD plane. After rolling, the electron back-scattering diffraction technique was introduced to investigate the grain boundary characteristic distributions of annealed materials. There was notable grain refinement in the Ni–10Cr alloy as a result of cross roll rolling. Consequently, the average grain size was refined from 135 µm in the initial material to 4.2 µm in the cross-roll rolled material. This refined grain size led to enhanced mechanical properties, such as yield and tensile strengths. Furthermore, the < 111 > // ND texture in the CRR material was better developed than that in the conventionally rolled material, contributing to enhancement of the mechanical properties and formability.