Microstructure and Mechanical Properties of Medium Carbon Martensitic Steel after Warm Rolling at Different Temperatures
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摘要: 利用SEM、EBSD和拉伸试验研究了轧制温度对中碳马氏体钢组织转变和力学性能的影响。结果表明:轧制温度由500℃升高到600℃时,在80%压下率下铁素体晶粒尺寸由0.51μm增加到0.78μm,碳化物颗粒尺寸由40 nm增加到200 nm,轧制温度对碳化物颗粒尺寸的影响明显高于铁素体;当轧制温度由500℃升高到600℃时,抗拉强度由1 029 MPa降低至909 MPa,总延伸率略有增加,温轧后试验钢的屈强比在0.963 90.983 2。Abstract: The effects of rolling temperature on microstructure transformation and mechanical properties of medium carbon martensitic steel were investigated by means of SEM,EBSD and tensile tests. The results show that when sample are subject to 80% deformation,with the rolling temperature increased from 500 ℃to 600 ℃,ferrite grain size increased from 0.51 μm to 0.78 μm,the carbide particle size increased from 40 nm to 200 nm,and the effect of temperature on the carbide particle size was significantly higher than that of ferrite.When the rolling temperature is increased from 500 ℃ to 600 ℃,the tensile strength decreased from 1 029 MPa to 909 MPa,and the total elongation increased slightly.The tensile strength ratio of the experimental steel was between 0.963 9 and 0.983 2 after warm rolling.
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Key words:
- medium carbon martensite steel /
- warm rolling /
- temperature /
- microstructure /
- mechanical properties
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