有色金属科学与工程2024，Vol.15Issue(2)：212-219,8.DOI:10.13264/j.cnki.ysjskx.2024.02.008
轧制压下率、路径对NiCoCr合金微观结构和力学性能的影响
The effects of cold rolling thickness reduction and path on the microstructure and mechanical properties of NiCoCr alloy
摘要
Abstract
Bulk NiCoCr alloy samples with different volume fraction of nano-twins and nano-grains were fabricated by cold rolling with various thickness reduction and strain path.Transmission electron microscopy observations indicate that the microstructure in the one-directional rolled sample with 50%thickness reduction is characterized by nano-twins and high density of dislocations.With increasing the rolling thickness reduction to 90%,the volume fraction of nano-twins decreases due to the activation of shear banding within the nano-twined lamellar area,which consequently leads to the formation of massive nano-grains with average sizes of 35 nm.The microstructure of the multi-directional rolled sample is mainly composed of nano-grains with main sizes of 27 nm,which is slightly smaller than that of one-directional rolled sample.Tensile test results show that the strength of the one-directional rolled sample with 50%thickness reduction is significantly enhanced with yield strength and ultimate tensile strength reaching 1 312 MPa and 1 396 MPa,respectively,which is much higher as compared to the coarse-grained alloy with solid solution heat treatment.The yield strength is further increased to 1 599 MPa with thickness reduction reaching 90%,and multiple-directional rolling gives rise to a higher yield strength of 1 705 MPa.Tensile testing results indicated that the grain refinement could significantly increase the strength,but deteriorate the ductility to some extent.关键词
轧制/镍基合金/力学性能/纳米孪晶/晶粒细化Key words
cold rolling/Ni-based alloys/mechanical properties/nano-twin/grain refinem分类
矿业与冶金引用本文复制引用
冯天,孔见,张勇,赵永好..轧制压下率、路径对NiCoCr合金微观结构和力学性能的影响[J].有色金属科学与工程,2024,15(2):212-219,8.基金项目
国家自然科学基金资助项目(51601091) （51601091）
江苏省前沿引领技术基础研究重大项目(BK20222014) （BK20222014）
