Scholarlink

<p>In this study, the microstructural evolution and mechanical properties of a 0.15 pct C-2.09 pct Mn multiphase steel was investigated. To produce a multiphase microstructure, a newly developed two-step processing of partial austenitization and quenching (PAQ) treatment was used. In the first step, the steel with initial martensitic microstructure was partially austenitized at 690&#xa0;°C for 8 hours. After cold rolling, a rapid reheating to 840&#xa0;°C and quenching done to simulate hot dip galvanizing conditions. To better understand the PAQ process, thermodynamic and kinetic simulations using ThermoCalc and DICTRA predicted phase transformations and elemental partitioning. Microstructural characterization via LM, SEM, and EBSD revealed an ultrafine-grained multiphase structure consisting of bainite, M/A, and intercritical ferrite. The PAQ840 sample showed an ultimate tensile strength of 740&#xa0;MPa and excellent ductility with 20 pct total elongation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Partial Austenitization Treatment on Microstructure and Mechanical Properties for Multiphase Steels

  • 期刊论文

  • 发表日期：

    2025年7月28日

查看全文
  • Ersoy Erişir,
  • Elif Sarı,
  • Emre Kocakuşaklı,
  • Nurten Başak Dülger,
  • Serkan Oktay,
  • Ramazan Tütük,
  • Kemal Davut

摘要

In this study, the microstructural evolution and mechanical properties of a 0.15 pct C-2.09 pct Mn multiphase steel was investigated. To produce a multiphase microstructure, a newly developed two-step processing of partial austenitization and quenching (PAQ) treatment was used. In the first step, the steel with initial martensitic microstructure was partially austenitized at 690 °C for 8 hours. After cold rolling, a rapid reheating to 840 °C and quenching done to simulate hot dip galvanizing conditions. To better understand the PAQ process, thermodynamic and kinetic simulations using ThermoCalc and DICTRA predicted phase transformations and elemental partitioning. Microstructural characterization via LM, SEM, and EBSD revealed an ultrafine-grained multiphase structure consisting of bainite, M/A, and intercritical ferrite. The PAQ840 sample showed an ultimate tensile strength of 740 MPa and excellent ductility with 20 pct total elongation.