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基于薄板坯连铸连轧工艺(CSP)和传统热连轧工艺特点,在实验室利用显微观察与拉伸试验,研究了两种热轧工艺对热轧基板与冷轧热处理后TRIP钢的微观组织及力学性能影响规律。并采用TEM对基于CSP工艺制备的冷轧热处理TRIP钢的微观组织特点进行分析。结果表明:CSP工艺制备的热轧板较传统热连轧工艺有利于获得更高的强度;CSP工艺制备冷轧热处理TRIP钢的抗拉强度与断后伸长率均优于传统热连轧工艺所制备的冷轧热处理TRIP钢,前者性能能达到780 MPa级TRIP钢的要求;通过TEM观察,基于CSP工艺制备冷轧热处理TRIP钢的残留奥氏体主要分布于铁素体晶界,少量分布于铁素体晶内和贝氏体板条间的薄膜处。
Based on the characteristics of CSP and traditional hot strip rolling process, microstructures and tensile tests were conducted in the laboratory. The effects of two hot rolling processes on hot-rolled substrates and cold-rolled TRIP steels The influence of microstructure and mechanical properties. The microstructure characteristics of cold-rolled heat-treated TRIP steels prepared by CSP process were analyzed by TEM. The results show that the hot rolled strip produced by CSP is better than the traditional hot strip rolling process in tensile strength and elongation at break after CSP cold-rolling heat treatment. The former TRIP steel with cold rolling heat treatment performance can reach the requirement of 780 MPa grade TRIP steel. The TEM shows that the retained austenite of TRIP steel is mainly distributed in the ferrite grain boundaries by CSP process, Films in ferrite and between bainite laths.