采用TEM观察了大应变冷拔SWRH72A钢丝经不同温度退火处理后的微观组织,并采用振动样品磁强计测量了钢丝磁学性能的变化.试验结果表明,大应变冷拔变形引起SWRH72A钢丝中渗碳体分解,部分碳原子溶入铁素体形成过饱和铁素体.变形后钢丝经200～300℃退火,由于渗碳体颗粒的弥散析出,钢丝强度升高到2400MPa.退火温度进一步升高到400℃,渗碳体片开始球化,钢丝强度大幅降低,但塑性显著增加.
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