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.
Highlights
Due to the moderate formability of high strength low alloy steels (HSLA), the steels called transformation induced plasticity (TRIP) have been developed
Tensile Tests: The mean yield and tensile strength, elongation amount and breaking point are given in Table 2 for TRIP800 steel, which is cold processed for two hours at various temperatures
The effects of cold heat treatment applied at various temperatures on the properties of TRIP800 steels were investigated
Summary
The formability of commercial low ductility high strength steels decreases almost linearly due to the increased strength. Tic transformation was indicated by Powell [19] while, the martensite ratio under multiaxial loading was determined by Hecker et al [20] Yoo et al [21], investigated the dynamic loading structural analysis of advanced high strength materials performed at low temperatures and simulated the temperature and strain rate change of TRIP steels in low temperature applications. They pointed out that advanced high strength materials show extreme sensitivity depending on the stress rate and temperature [21]. The experimental results simulated with the proposed numerical model revealed that TRIP steels exhibit nonlinear material properties at low temperature [21]
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