Parameters optimization design of quenching and partitioning for best combination between strength and ductility using orthogonal experimental design

• DOI: 10.1007/s42243-019-00280-4
• Publication Date: 2019-05-28T07:27:17Z
• Authors: Ming-qing Liao; Zhong-hong Lai; Aorigele Bao; Yong Liu; Dan-ni Yang; Tian-yi Han; Jing-chuan Zhu; Rong-da Zhao
• Keywords: Ductility (Earth science); Tempering; Strength reduction

Quenching and partitioning (QP meanwhile, the number of experiments was reduced significantly. When treated by quenching at 180 °C followed by partitioning at 330 °C for 20 min, the steel reached the best combination between strength and ductility. In detail, the product of ultimate tensile strength and reduction in area was 1.36 times (from 64.9 to 88.8 GPa%) that treated by quenching and tempering. In addition, owing to the grain refinement, the strength and ductility increase simultaneously. Specifically, the reduction in area increased by 27.4% (from 35.8% to 45.6%) coupled with a little improvement in ultimate tensile strength (7.4%).