Effect of Final Cold Rolled Microstructures on Creep Deformation Behavior in Nickel Base Alloy
Keywords:Nickel-base, Hot and cold working, Annealing process, Microstructure evolution, Recrystallized structure, and Creep deformation
It was found that the annealed microstructure resulting from only one or two steps of hot working in NiMoCr alloy was not uniform throughout the specimens as desired. In order to obtain more uniform grain structures an additional cold working was utilized. The following annealing process was supposed to achieve uniform recrystallized grain structure. It was found that the annealed microstructures after cold working were more homogeneous than those without any cold working. Furthermore, the uniformity of the microstructure increased with a higher amount of introduced deformation. The creep tests to evaluate the high temperature strength of the alloy were carried out at a stress of 160 MPa and at a temperature of 710oC. The results showed that creep characteristics, namely rupture strain, strain rate, and lifetime, greatly depend on the initial cold working conditions (degree of reduction) carried out prior to creep test. The creep results showed that creep lifetime increased as reduction increased in a range of 4.8 to 15%. This result was probably due to the majority effect of the strain hardening in non-recrystallized or deformed grains where dislocation tangles after uncompleted annealing have been presented. For the highest reduction, the stored energy from deformation was quite enough to modify and make more uniform grain structure through out the samples. However, a more uniform and finer recrystallized grains structure slightly decreased creep lifetime as an effect of smaller grain size.
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