Investigation of the Influence of Cold-Treatment on Properties of Advanced High Strength Automotive Steels

Abstract

Due to the moderate formability of low alloy high strength steels, (TRIP) steels called "transformation induced plasticity" have been developed. They are especially used in the production of automobile shock absorbers and the beam supporting parts. The microstructure of these steels consists of the distribution of ferrite, bainite and (5 - 10%) residual austenite phases in the matrix. The strength and formability of steels are generally provided by the residual austenite in the structure. During shaping, the residual austenite turns into martensite and gives high strength to the steel. Considering the literature studies, it is pointed out that there is a lack of information about the effect of cold treatment on TRIP steels. For this reason, in the study, TRIP800 steel has maintained cold treatment for two hours at various temperatures. Thus, the mechanical properties and microstructure changes of the samples were examined in detail.

Keywords

• TRIP steels
• Cold treatment
• Mechanical properties
• Microstructure

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