建筑用抗震钢板的控轧控冷工艺与性能研究
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摘要
研究了开冷温度、终冷温度和轧制工艺对低碳高锰建筑钢板常温拉伸性能、-40℃冲击功、屈强比和显微组织的影响,分析了工艺参数与性能之间的关系和作用机理。结果表明,随着开冷温度的降低,屈强强度、抗拉强度和-40℃冲击功逐渐降低,而断后伸长率逐渐增加,适当降低开冷温度有助于降低材料的屈强比;随着终冷温度的降低,屈服强度和抗拉强度逐渐升高,而断后伸长率和-40℃冲击功逐渐减小,屈强比上升。试验钢具有较高强塑性的同时具有较低的屈强比,主要与组织中相对软的贝氏体铁素体和较硬的M-A岛复相组织以及晶粒尺寸有关。
The effects of starting cooling temperature, final cooling temperature and rolling process on the tensile properties,impact work at-40℃, yield ratio and microstructure of the low carbon and high manganese building steel plate were studied. The relationship between process parameters and properties and the mechanism of action were analyzed. The results show that with the decrease of starting cooling temperature, the yield strength, tensile strength and impact work at-40℃gradually decrease, but the elongation after fracture increases gradually. Properly decreasing starting cooling temperature is helpful to reduce the yield ratio of the material. With the decrease of the final cooling temperature, the yield strength and tensile strength gradually increase, while the elongation after fracture and the impact work at-40 ℃ gradually decrease, and the yield strength ratio increases. The test steel has high ductility and low yield ratio, Which is mainly related to the relatively soft bainitic ferrite in the microstructure and the hard M-A island multiphase microstructure as well as the grain size.
The effects of starting cooling temperature, final cooling temperature and rolling process on the tensile properties,impact work at-40℃, yield ratio and microstructure of the low carbon and high manganese building steel plate were studied. The relationship between process parameters and properties and the mechanism of action were analyzed. The results show that with the decrease of starting cooling temperature, the yield strength, tensile strength and impact work at-40℃gradually decrease, but the elongation after fracture increases gradually. Properly decreasing starting cooling temperature is helpful to reduce the yield ratio of the material. With the decrease of the final cooling temperature, the yield strength and tensile strength gradually increase, while the elongation after fracture and the impact work at-40 ℃ gradually decrease, and the yield strength ratio increases. The test steel has high ductility and low yield ratio, Which is mainly related to the relatively soft bainitic ferrite in the microstructure and the hard M-A island multiphase microstructure as well as the grain size.
引文
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[2]陈振业,孙力,刘宏强,等.160MPa级建筑抗震用极低屈服点钢板的开发[J].钢铁钒钛,2017,38(2):128-131.
[3]宋凤明,温东辉,李自刚.抗震用极低屈服点钢组织和性能研究[J].热加工工艺,2008,37(22):28-31.
[4]王丹丹.不同退火工艺下建筑抗震钢板的显微组织和力学性能研究[J].铸造技术,2015,36(7):1716-1718.
[5]Tamimi S,Ketabchi M,Parvin N.Microstructural evolution and mechanical properties of accumulative roll bonded interstitial free steel[J].Materials&Design,2009,30(7):2556-2562.
[6]曹立潮,余宏伟,卜勇,等.低屈强比特厚钢板的控制轧制和正火工艺研究[J].热加工工艺,2014,43(13):48-51.
[7]何博,蔡庆伍,李瑞,等.抗震用160MPa级低屈服点钢制备工艺研究[J].轧钢,2014,31(1):10-13.
[8]沈冬冬,夏靖超,师静蕊,等.终冷温度对550 MPa级抗震钢组织与性能的影响[J].热加工工艺,2016,45(23):60-62.
[9]吴腾,吴润,熊维亮,等.终轧温度对C-Mn型热轧双相钢组织与性能的影响[J].金属热处理,2017,42(4):124-127.
[10]贾汝达.热处理对高强建筑用钢组织和力学性能的影响[J].热加工工艺,2017,46(16):199-201.