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为研究连续退火工艺生产中锰TRIP钢汽车板的可行性,在钢板连续退火模拟机CCT--AY--Ⅱ上研究了590~710℃不同退火温度下保温3 min对低碳中锰钢组织性能的影响.利用扫描电镜、透射电镜、电子背散射衍射和X射线能谱分析等微观分析方法对实验钢进行了组织结构和成分表征,利用X射线衍射法测量了残余奥氏体量,通过拉伸试验机测试了钢的单轴拉伸性能.结果表明:保温3min时,随着保温温度的升高,残奥含量先增加后减少.在650℃退火时断后伸长率(21.3%)和强塑积(28GPa·%)获得最大值,抗拉强度达到1330MPa.马氏体基体通过回复,而残余奥氏体通过孪晶,获得超细晶组织.亚稳奥氏体的TRIP效应和超细晶铁素体(马氏体)共同提供了实验钢高的塑性.实验钢真实应力--应变曲线上呈现锯齿状现象,且稳定阶段加工硬化指数远高于传统TRIP钢.
In order to study the feasibility of continuous annealing process for producing manganese TRIP steel automotive sheet, the effects of different annealing temperatures of 590 ~ 710 ℃ for 3 min on the continuous annealing simulator CCT - AY - Ⅱ were studied. The structure and composition of the experimental steel were characterized by SEM, TEM, electron backscatter diffraction and X-ray energy spectrum analysis. The residual austenite content was measured by X-ray diffraction Tensile test was used to test the uniaxial tensile properties of steel.The results showed that the content of Paralympic increased first and then decreased with the increase of holding temperature for 3min.When annealed at 650 ℃, the elongation at break (21.3% And the strong plastic product (28GPa ·%) obtained the maximum value, the tensile strength reached 1330MPa. The martensite matrix by recovery, and the residual austenite by twins to obtain ultrafine grained microstructure. The metastable austenite TRIP effect and Superfine-grained ferrite (martensite) together provided a high plasticity of the experimental steel, showing a serrated phenomenon on the real stress-strain curve of the experimental steel, and the work hardening index in the stable phase was much higher than that of the conventional TRIP steel.