探索了在新一代钢中获得超细晶粒的方法.通过低温轧制和应变诱导铁素体相变,可以在碳素结构钢中获得晶粒尺寸小于5μm的超细晶粒,屈服强度大于400MPa.采用应变诱导铁素体相变可以在微合金钢中得到晶粒尺寸为1μm的超细晶粒.低碳微合金钢的屈服强度达到了600 MPa,超低碳微合金钢的屈服强度超过了800MPa.采用微合金化和循环热处理可以在合金结构钢中获得2 μm的奥氏体晶粒,1 500MPa级抗拉强度下改善了耐延迟断裂性能.
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