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研究了0Cr32Ni7Mo4N双相不锈钢热轧后冷轧和直接冷轧的成形性能,分析了室温下α相和γ目的塑性变形机制以及经过热轧、冷轧及固溶处理后的组织演变规律,并测试了2种成形工艺冷轧板热处理后的力学性能和耐蚀性能,分别采用OM和SEM观察金相和腐蚀形貌.结果表明:实验钢在热轧后板边部开裂,切边后经热处理再冷轧,成形性良好;铸态钢坯经过1100℃固溶处理后直接冷轧,成形性能与其相当.室温下a相的变形机制为多系滑移形成位错胞状结构,r相为单系滑移和机械孪晶;冷轧板随着热处理温度升高,组织变得更均匀,析出物颗粒数量减少;直接冷轧的钢板经热处理后,抗拉强度达到1082.9 MPa,延伸率为29.3%,在3.5%NaCl溶液中临界点蚀电位为1060 mV经过65%HNO_3溶液腐蚀后失重率为0.05 g/(m~2·h),与常规热轧加冷轧后的钢板相当.
The formability of 0Cr32Ni7Mo4N duplex stainless steel after cold rolling and direct cold rolling was studied. The mechanism of α, γ phase plastic deformation at room temperature and the microstructure evolution after hot rolling, cold rolling and solution treatment were analyzed and tested The mechanical properties and corrosion resistance of the cold-rolled sheet after the two forming processes were investigated by OM and SEM respectively.The results show that the experimental steel is cracked at the edge of the hot-rolled sheet, And then cold-rolled with good formability.The as-cast billet was directly cold-rolled after solution treatment at 1100 ℃ .The formability of the as-cast billet at room temperature was multi-system slip formation dislocation cell structure and r phase was single Slip and mechanical twins. With the increase of heat treatment temperature, the microstructure became more uniform and the amount of precipitated particles decreased. The tensile strength of direct cold rolled steel reached 1082.9 MPa and the elongation was 29.3% , The critical pitting potential is 1060 mV in 3.5% NaCl solution and the weight loss rate is 0.05 g / (m ~ 2 · h) after 65% HNO_3 solution corrosion, which is equivalent to the conventional hot rolling and cold rolled steel plate.