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为了评价碳含量和退火温度对含有残留奥氏体的冷轧钢板机械性能的影响,对含0.12～0.40％C、1.2％Si、1.5％Mn的冷轧钢板在Ac_1以下400℃等温转变处理和临界退火、等温转变时问为100～300秒,结果获得最好的强度和韧性配合。最终强度为590MPa(0.12％C)～980MPa(0.4％C)。总延伸率为33～39％。优于类似强度级别的普通铁素体-马氏体双相钢。这些试样含有7～20％的残留奥氏体且与碳含量呈线性关系。与普通双相钢比较,残留奥氏体的机械性能稳定性得到改善,在高强度情况下韧性也得到提高。保持了最佳的强度和韧性配合。由于高韧性的铁素体含量增加,即使碳含量不高亦能保持较好的强韧性。
In order to evaluate the effect of carbon content and annealing temperature on the mechanical properties of cold-rolled steel with retained austenite, cold-rolled steel with 0.12-0.40% C, 1.2% Si and 1.5% Mn isothermally transformed at 400 ℃ below Ac_1 and Critical annealing, isothermal transformation asked for 100 to 300 seconds, the results get the best strength and toughness with. The final strength was 590 MPa (0.12% C) ~ 980 MPa (0.4% C). The total elongation of 33 to 39%. Better than similar ferritic-martensitic duplex steels with similar strength levels. These samples contain 7-20% retained austenite and have a linear relationship with carbon content. Compared with ordinary dual-phase steel, the mechanical properties of retained austenite stability has improved, in the case of high strength toughness has also been improved. Maintain the best strength and toughness with. Due to the increased toughness of the ferrite content, even if the carbon content is not high also maintain good strength and toughness.