原始组织细小、并经过适当冷变形的65Mn钢丝,在电接触快速加热条件下,适当控制加热温度,一次加热分级淬火、回火即可获得11-12级或更细小的奥氏体晶粒度。实验发现,虽然平均晶粒度已达到10级以上,但仍有混晶现象(级差在4～6级)。性能测试证明,经同一温度回火的钢丝,其屈服强度σ_(0.2)与原奥氏体平均晶粒尺寸之间仍符合Hall-Petch公式。 The original organization of small, and after appropriate cold deformation of the 65Mn wire, electrical contact with rapid heating conditions, the appropriate control of the heating temperature, a heat quenching and tempering graded to get 11-12 or finer austenite grain size . Experiments found that, although the average grain size has reached more than 10, but there are still mixed crystal phenomenon (level difference in the 4 to 6). Performance tests show that the steel wire tempered at the same temperature still meets the Hall-Petch formula between the yield strength σ 0.2 (0.2) and the original austenite average grain size.