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通过观察新型奥氏体耐热不锈钢(AFA不锈钢)试样在不同条件下再结晶的金相组织,研究了AFA不锈钢再结晶过程中的组织演变行为.结果表明,冷轧20%的AFA不锈钢试样在1473 K等温2 h以上才能完全再结晶;完全再结晶的试样在1023 K,应变速率为6.4×10-7s-1条件下拉伸时,稳态流变强度保持在130 MPa左右,并且具有良好的塑性变形能力和明显的加工硬化效果.但若不能完全再结晶,在相同实验条件下试样具有较高的强度(150 MPa),但是塑性变差.AFA不锈钢再结晶晶粒长大过程受到NbC相析出的影响,其晶粒长大指数由理想晶粒长大的2变为3,表观激活能为234.7 kJ/mol,与Nb在奥氏体钢中沿晶界扩散的激活能吻合.
The microstructure evolution of AFA stainless steel during recrystallization was studied by observing the microstructure of recrystallized austenitic heat-resistant stainless steel (AFA stainless steel) specimens under different conditions. The results show that the cold rolling 20% AFA stainless steel The sample completely recrystallized at 1473 K isothermal for more than 2 h. The steady-state rheological strength of the completely recrystallized sample was maintained at about 130 MPa at 1023 K and strain rate of 6.4 × 10-7s-1. And has good plastic deformation ability and obvious work hardening effect.But if not completely recrystallized, the sample under the same experimental conditions has a high strength (150 MPa), but the plasticity deteriorates .AFA stainless steel recrystallization grain length The large process is affected by the precipitation of NbC phase. The grain growth index changes from 2 for the ideal grain growth to 3 and the apparent activation energy is 234.7 kJ / mol, which is in agreement with the diffusion of Nb along the grain boundaries in the austenitic steel Activation can match.