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研究了高氮CrMn型不锈钢在温度950~1200℃,应变速率0.01~10 s-1内热变形时的力学行为与动态组织演变规律。通过回归计算,得到了试验钢热变形激活能为320 kJ/mol,表观应力指数3.51,建立了热变形方程;得到了峰值应力(σp)、发生动态再结晶的临界应变(εc)与温度(T)、应变速率间(ε觶)的定量关系。结果表明,σp与εc均随T升高而降低,随ε觶增加而增大。在1150℃、0.01 s-1热变形条件下试验钢可获得均匀细小的完全动态再结晶组织。
The mechanical behavior and dynamic microstructure evolution of high nitrogen CrMn stainless steel during hot deformation at 950-1200 ℃ and strain rate of 0.01-10 s-1 were studied. Through regression calculation, the thermal deformation activation energy of the test steel was 320 kJ / mol and the apparent stress index was 3.51. The thermal deformation equation was established. The peak stress (σp), the critical strain (εc) of dynamic recrystallization and the temperature (T), between the strain rate (ε 觯) quantitative relationship. The results show that both σp and εc decrease with increasing T, and increase with ε 觯. In 1150 ℃, 0.01 s-1 thermal deformation of the test steel can be uniform and small completely dynamic recrystallization microstructure.