研究了预处理温度对低温用马氏体高强度不锈钢板材强度的影响。通过对材料进行力学性能检测、金相检测、X射线衍射分析后表明：热轧材750～850℃预处理遗传了热轧态的组织,使最终固溶处理后的奥氏体内累积了较高的缺陷密度,这些高密度缺陷最终遗传到马氏体内。850℃预处理的材料既存在缺陷强化,又降低最终的残余奥氏体含量,因此出现强度峰值。冷轧材的组织遗传、再结晶等特征温度低于热轧材,25%和50%变形的冷轧材分别在800℃和750℃预处理出现强度峰值。
The effect of preliminary treatment temperature on the strength of martensitic stainless strip steel for cryogenic application has been investigated. After the investigal：ion of mechanical properties, metallographic exam- ination, X-ray diffraction, it can be seen that the original structural inheritance occur in the hot rolled steel strip preliminarily treated at temperatures between 750℃ and 850℃ , which lead to an accumulation of defects in the austenite after finally heating for austenitizing. The high densJLty defects in the austenite are inherited by the mar- tensite formed after final solution treatment. The peak strength is present in hot rolled steel strip preliminarily trea- ted at 850 ℃, which is attributed to both the defect strengthening in the martensite and less residual austenite in it. In the cold rolled steel, some characteristic temperatures, at which the structural inheritance and recrystallization take place, decrease in consecutive order. For the cold rolled steel strips with 25% and 50% reduction, the strength peaks are achieved after being preliminarily treated at 800 ℃ and 750℃ respectively.
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