热处理工艺对硅锰双相钢纤维双相组织形成与变化的影响

lnfluence of Heat-treatment Process on the Formation and Variation of Fibrous Dual-Phase Structure of Si-Mn Dual-Phase Steels

本文研究了两种低碳硅锰钢,选择了热轧态及扩散退火态两种原始组织,考察了在不同热处理工艺条件下纤维双相组织形成的特点。试验结果表明:(1)在第一次淬火(γ相区)加热条件给定时,第二次淬火(在α+γ两相区加热)后,硅量较高的钢纤维双相组织开始消失的温度也较高;(2)在同样条件下,扩散退火态试样得到的纤维双相组织比热轧态试样得到的细密。然而,扩散退火态试样得到的纤维双相组织开始消失的温度低于热轧态试样的该温度。

In this paper two low-carbon Si-Mn steels were studied. Two original structures—as-hot-rolled and as-diffusion-annealed were chosen. The characteristics of the formation and variation of fibrous dual-phase structure produced by different heat-treatment processes were studied. The results show. (1) When the first quenching (in γ-phase region) is fixed the starting temperature of the disappearance(STD) of fibrous dual-phase structure formed at the second quenching process (heating in the α+γ two-phase region) increases with silicon content of steel; (2) Under tile same condition, the fibrous dual-phase structure produced in the as-diffusion-annealed specimen is finer than that formed in the as-hot-rolled specimen. But the STD of fibrous dual-phase structure formed in the as-diffusionannealed specimen is lower than that formed in the as-hot-rolled specimen.