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采用有限元方法对AISI 304钢经1 100℃,0.1,1,10 s~(-1)的热压变形过程进行了数值模拟,分析了变形试样上等效应变的分布情况,确定了实际变形条件与试验设定条件之间的关系及合理的组织观察位置,研究了不均匀变形对奥氏体显微组织变化的影响。结果表明:不锈钢热压试样变形与组织不均匀性十分明显,心部的等效应变比实际设定值大40%左右,而端面值小于设定值的1/6,且应变速率对等效应变的分布情况影响不大;1 100℃,1 s~(-1),设定真应变为1(工程应变为63.2%)的试验条件下,变形试样心部组织发生完全动态再结晶,变形轴线端面位置组织与未变形组织形貌相似,且试样截面上硬度分布不均匀,沿变形轴线方向,硬度从端面到心部逐渐增大,端面硬度最小值为238HV,心部硬度最大值为251HV。
The finite element method was used to simulate the hot deformation process of AISI 304 steel at 1 100 ℃, 0.1,1,10 s ~ (-1), and to analyze the distribution of equivalent strain on the deformed specimen. The actual The relationship between the deformation conditions and experimental conditions and the reasonable position of the microstructure observation, the effect of the inhomogeneous deformation on the microstructure of the austenite was studied. The results show that the deformation and microstructure heterogeneity of the hot-pressed stainless steel are very obvious. The equivalent strain of the core is about 40% larger than the actual value, while the value of the end face is less than 1/6 of the set value, and the strain rate is equal The effect of the distribution of the effect of strain has little effect; under the experimental conditions of 1 100 ℃, 1 s ~ (-1), set the true strain to 1 (engineering strain of 63.2%), completely dynamic recrystallization , The position of the end face of the deformation axis is similar to that of the non-deformed part, and the hardness distribution is not uniform along the cross section of the specimen. The hardness gradually increases from the end face to the heart part along the deformation axis. The minimum hardness of the end face is 238HV, The value is 251HV.