利用控轧控冷工艺,在超低碳微合金管线钢中获得了不同组成比的针状铁素体复相组织,并对其复杂的组织进行了定量金相研究,探讨了组织组成比与材料强度的关系.研究结果表明,降低终轧温度、提高冷却速度均导致管线钢强度的显著提高,归功于针状铁素体复相组织中的粒状铁素体、贝氏体铁素体等低温组织含量的增加;低温组织含量的增加比提高卷取温度导致的沉淀析出增多对强度提高的贡献更大.
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