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利用热膨胀仪、热处理实验、拉伸实验和X衍射实验研究了不同临界退火温度对0.15C-1.5Mn-1.5Al TRIP钢相变、残余奥氏体特征和力学性能的影响.结果表明:不同临界退火温度下的热膨胀曲线具有相同的变化过程,两相区奥氏体含量随临界退火温度的升高而上升,而其碳含量则下降;临界退火温度影响试样的残余奥氏体特征和力学性能,820℃退火处理时残余奥氏体的体积分数为14%,碳的质量分数为1.36%;力学性能也是820℃退火时最佳,强塑积可达25400 MPa.%,且变形过程中具有高的瞬时加工硬化指数(n值).
The effects of different critical annealing temperatures on the phase transformation, retained austenite characteristics and mechanical properties of 0.15C-1.5Mn-1.5Al TRIP steel were investigated by means of dilatometer, heat treatment, tensile test and X-ray diffraction. The results show that: The thermal expansion curves at the annealing temperature have the same variation. The austenite content in the two-phase region increases with the increase of the critical annealing temperature, while the carbon content decreases. The critical austenite temperature affects the retained austenite characteristics and mechanical properties The volume fraction of retained austenite is 14% and the mass fraction of carbon is 1.36% when annealed at 820 ℃. The mechanical property is also the best when annealed at 820 ℃, and the strong plastic product reaches 25400 MPa.%, And the deformation process Has a high instantaneous work hardening index (n value).