中文摘要：

研究了等通道转角挤压（ECAP）及后续退火处理对Fe19.04Mn4.98Si8.50Cr4.59Ni合金回复应力的影响.结果表明,挤压态合金的回复应力随退火温度的升高,先增加后降低,峰值出现在600℃左右.较低温度退火时,挤压态合金屈服强度很高,但平台回复应力很低,600℃退火后,平台回复应力达到最佳值180MPa.600℃退火处理后,挤压态合金的最大回复应力达到590MPa,室温回复应力达到540MPa,与固溶态合金相比都提高了两倍.微观分析显示,再结晶晶粒平均尺寸为5μm,比固溶态合金晶粒尺寸低两个数量级,细晶强化是基体强度和回复应力提高的主要原因.

英文摘要：

Effects of equal channel angular pressing (ECAP) and subsequent annealing temperature on the recovery stress of Fe-19.04 Mn-4.98 Si-8.50 Cr-4.59 Ni alloy were studied. The results show that the recovery stress of the as-pressed specimen increasing first and then decreasing with annealing temperature increasing. The optimum annealing temperature for recovery stress is 600°C. The lower annealing temperature gives the higher yield stress and lower plateau stress for the ECAP alloy. When annealing temperature increasing to 600°C, the optimum plateau stress is 180 MPa. The maximum recovery stress and room recovery stress reach 590 MPa and 540 MPa, respectively, which are both 200% higher than that of the as-quenched ones, and then decrease with further increasing temperature. TEM analysis shows that the average size of the recrystallized grains is about 5 μm, two orders of magnitude smaller than that of the as-quenched specimens, which is the main reason for strengthening of matrix and improvement of recovery stress.