为了进一步提高Fe-6.5％ Si合金的塑性变形性能,以1100℃保温1h油淬处理后的Fe-6.5％ Si合金为对象,重点研究了不同回火温度和保温时间下合金的有序结构回复和残余应力松弛行为及其对三点弯曲力学性能的影响.结果表明,合理的回火处理工艺可在有效抑制有序结构回复的情况下显著松弛合金的淬火残余应力,进而提升淬火试样的塑性变形性能.300℃回火60 min、400℃回火10 min和500℃回火10 min试样的最大弯曲断裂挠度与淬火态试样相比分别提高了20.7％,31.3％,21.8％.合金塑性变形性能提高的原因与回火处理导致合金无序-有序结构回复以及试样表面微观残余应力的松弛有关.以400℃回火处理保温10 min为例,合金试样的有序相畴尺寸由淬火试样的20～ 200 nm提高到50 ～300 nm,表面残余拉和压应力分别降低了16.5％和19.4％.
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