Effects of Austempering after Hot Deformation on the Mechanical Properties of Hot Rolled Si-Mn TRIP Steel Sheets

材料热处理学报, 2004, 25(5): 248-251.

^1, , ^2, , ^3,

1.State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110004, China;Institute of Aeronautical Engineering, Shenyang 110034, China

2.Liaoning Provincial Education Department, Shenyang 110032, China

3.State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110004, China

基金项目: 国家自然科学基金(50334010) 东北大学校科研和教改项目(200302)

Effects of Austempering after Hot Deformation on the Mechanical Properties of Hot Rolled Si-Mn TRIP Steel Sheets

Keywords： hot rolled

Excellent mechanical properties are obtained by austempering after hot deformation without subsequent heat treatment in the present Si-Mn TRIP steel sheets. Isothermal holding time after finishing rolling has affected the mechanical properties of this steel. The results show that the sample exhibits a good combination of ultimate tensile strength and total elongation when it is held at the bainite transformation temperature after hot deformation. The stability of retained austenite increases with an increase of isothermal holding time, and a further increase in the holding duration results in a decrease of it. The tensile strength, total elongation and strength ductility reach the maximum values(774MPa, 33% and 25542MPa% respectively) for this sort of hot rolled Si-Mn TRIP steel using the optimal technology.

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Effects of Austempering after Hot Deformation on the Mechanical Properties of Hot Rolled Si-Mn TRIP Steel Sheets

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