采用金相显微镜、SEM等试验方法,研究了中碳铁索体/马氏体双相钢的组织及性能.结果表明:在785～800 ℃淬火,起始组织为铁素体加珠光体的A型组织钢和起始组织为马氏体的B型组织钢随两相区淬火温度的升高强度升高;原始组织不同两相区淬火后钢的组织及性能不同,经785℃×30 min淬火的B型组织钢强度明显高于A型组织钢,经800℃×30 min淬火的B型组织钢伸长率和断面收缩率高于A型组织钢;785 ℃保温10 min淬火的B型组织钢相比于A型组织钢奥氏体化过程加速,钢的强度及塑性均好于A型组织钢;两相区淬火具有双相组织的钢具有连续屈服和快速应变硬化现象及低的屈强比,785 ℃×30 min两相区处理的钢与调质处理的钢相比塑性低但强度明显提高,785℃×10 min两相区处理的B型组织钢强度略低于调质钢,但塑性略有增加.
Microstructure and mechanical properties of dual phase steel with ferrite and martensite were studied by means of optical microscope(OM), scanning electromicroscopy(SEM) and tensile tests. The results show that for the steel with type A microstructure of ferrite and pearlite and type B microstructure of martensite, the strength increases with increasing intercritical quenching temperature in the range of 785 ～ 800 ℃. The differences of their inital microstructure result in the differences of the final microstructure and mechanical properities of the intercritically quenched steel. Strength of the quenched steel with type B microstructure is higher than that with type A microstructure after intercritical quenching at 785 ℃ for 30 min. Elongation and reduction of the steel with type B microstructure are higher than that with type A microstructure when the steel is intercritical quenching at 800 ℃ for 30 min. Austeniting process is accelerated in the steel with microstructure of type B compared to type A for intercritical quenching at 785 ℃ for 10 min, which results in higher strength and plasticity of the former than the latter. Dual-phase steel with the microstructure of martensite and ferrite exhibits high strength and hardening rate, continuous yielding and low yield ratio. Steel intercritically quenched at 785 ℃ for 30 min possesses lower plasticity and much higher strength than that quenched and tempered. The steel with type B microstructure after intercritically quenched at 785 ℃ for 10 min exhibits a little lower strength and slightly higher plasticity compared to that of the steel quenched and tempered.
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