C-Si-Mn TRIP steels were produced using the thin slab casting and rolling （TSCR） process under simulation in laboratory. The results of tensile tests show that the yield strength, tensile strength, and the total elo...C-Si-Mn TRIP steels were produced using the thin slab casting and rolling （TSCR） process under simulation in laboratory. The results of tensile tests show that the yield strength, tensile strength, and the total elongation of the experimental TRIP steels are 430 MPa, 610 MPa, and 28.4%, respectively. Optical microscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM） were employed to identify the microstructures of the TRIP steels. The final microstructures consist of ferrite, bainite, and retained austenite. The results of quantitative color metallography show that the fraction of the retained austenite is about 5.8%.展开更多
Tensile mechanical behavior of cold rolled Si-Mn steel after TRIP (TRansformation Induced Plasticity) and DP (Dual Phase) treatment were investigated under different strain rates.The dynamic tensile test was carried o...Tensile mechanical behavior of cold rolled Si-Mn steel after TRIP (TRansformation Induced Plasticity) and DP (Dual Phase) treatment were investigated under different strain rates.The dynamic tensile test was carried out using the rotation disk bar-bar tensile impact apparatus.At static tension test condition,the values of total elongation for TRIP steel was approximately 2-3 times higher than DP steel because of TRIP effect;the DP steel showed a higher tensile strength because of 39.6vol% martensite in the matrix.The results of tension test at high strain rate condition were different.For the studied steel,the elongation increased with increasing strain rate due to softening of matrix caused by adiabatic heating;in addition,TRIP steel at low strain rate was always higher than that at high strain rate because progressive strain induced retained austenite was suppressed at high strain rate.展开更多
研究了等温淬火的等温温度和等温时间对低碳Si-Mn系TR IP钢力学性能的影响。试验用钢经810℃两相区加热,保温50 m in,在380℃盐浴中等温淬火20 m in,得到贝氏体+铁素体+残留奥氏体的三相组织,具有较高的抗拉强度(Rm=843 MPa)和良好的塑...研究了等温淬火的等温温度和等温时间对低碳Si-Mn系TR IP钢力学性能的影响。试验用钢经810℃两相区加热,保温50 m in,在380℃盐浴中等温淬火20 m in,得到贝氏体+铁素体+残留奥氏体的三相组织,具有较高的抗拉强度(Rm=843 MPa)和良好的塑性(A5=31%)。展开更多
基金This work was financially supported by the National Natural Science Foundation of China (No.50334010).
文摘C-Si-Mn TRIP steels were produced using the thin slab casting and rolling （TSCR） process under simulation in laboratory. The results of tensile tests show that the yield strength, tensile strength, and the total elongation of the experimental TRIP steels are 430 MPa, 610 MPa, and 28.4%, respectively. Optical microscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM） were employed to identify the microstructures of the TRIP steels. The final microstructures consist of ferrite, bainite, and retained austenite. The results of quantitative color metallography show that the fraction of the retained austenite is about 5.8%.
基金supported by National Natural Science Foundation of China under Grant No.50971137 and 50934011National Basic Research Program of China (973) under Grant No.2010CB630802
文摘Tensile mechanical behavior of cold rolled Si-Mn steel after TRIP (TRansformation Induced Plasticity) and DP (Dual Phase) treatment were investigated under different strain rates.The dynamic tensile test was carried out using the rotation disk bar-bar tensile impact apparatus.At static tension test condition,the values of total elongation for TRIP steel was approximately 2-3 times higher than DP steel because of TRIP effect;the DP steel showed a higher tensile strength because of 39.6vol% martensite in the matrix.The results of tension test at high strain rate condition were different.For the studied steel,the elongation increased with increasing strain rate due to softening of matrix caused by adiabatic heating;in addition,TRIP steel at low strain rate was always higher than that at high strain rate because progressive strain induced retained austenite was suppressed at high strain rate.
