C Si Mn Cr Nb钢双相组织性能的柔性控制

 根据C Si Mn Cr Nb试验钢的双道次变形和分段冷却热模拟试验结果，进行了试验钢控轧控冷试验，分析了工艺参数对试验钢组织和性能的影响，获得了具有不同力学性能的铁素体+马氏体或铁素体+贝氏体双相组织。结果表明，试验钢两段轧制分段冷却后550 ℃卷取获得铁素体+马氏体双相组织，屈服强度415 MPa，抗拉强度710 MPa，伸长率23.0％，屈强比0.59。500 ℃卷取得到铁素体加粒状贝氏体双相组织，与550 ℃卷取相比，屈服强度升高35 MPa，抗拉强度降低45 MPa，伸长率略微降低。

Flexible Control of Dual Phase Microstructure and Properties of C-Si-Mn-Cr-Nb Steel

In the light of experimental results of two pass deformation and step cooling thermal mechanical experiments of C Si Mn Cr Nb steel, the controlled rolling and controlled cooling experiment was carried out to analyze the effect of process parameters on microstructure and mechanical properties of the steel. Dual phase microstructure of ferrite and martensite or ferrite and bainite with different mechanical properties were obtained. It was shown that the microstructure of tested steel strip coiled at 550 ℃ after two stage rolling and three stage cooling was of ferrite and martensite with YS of 415 MPa, TS of 710 MPa, EL of 23.0%, and YS/TS of 0.59. The microstructure of the steel strip coiled at 500 ℃ was of ferrite and bainite. And compared with the strip coiled at of 550 ℃ the YS was increased by 35 MPa, TS decreased by 45 MPa, and EL decreased somewhat.