回火温度对9310钢力学性能及组织的影响
Influence of Tempering Temperature on Mechanical Properties and Microstructure of 9310 Steel
吴秋平,王春旭,厉勇,刘宪民
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作者单位:中国商飞上海飞机设计研究院, 钢铁研究总院结构材料研究所
中文关键字:9310钢;力学性能;显微组织;ε碳化物
英文关键字:9310 steel; Mechanical Properties; Microstructure; ε-carbide
中文摘要:本文通过拉伸、冲击和硬度等力学试验方法以及透射电子显微镜(TEM)对9310渗碳钢的力学性能和组织进行了研究,并采用热力学平衡计算(Thermo-Calc软件)方法,得到了该钢的平衡相图。结果表明:9310钢淬火后具有最高的抗拉强度,随着回火温度的升高,在100℃~350℃的温度范围内,9310钢的抗拉强度缓慢降低,当温度高于350℃时,其抗拉强度快速下降;9310钢的屈服强度随的回火温度的升高而逐渐升高,在250℃~350℃时达到峰值,随后逐渐降低;冲击韧性随着回火温度的升高而逐渐升高,在250℃时达到峰值,而随后在350℃~450℃温度范围内为最小值,而温度高于450℃后又会升高。9310钢在150~250℃温度区间回火后细小的ε碳化物在板条马氏体基体中弥散析出分布,此时9310钢具有最佳的强韧性配合。
英文摘要: In this paper, with the methods of mechanical test and Transmission Electron Microscope (TEM) the influence of tempering temperature on microstructure and mechanical properties of carburizing 9310 steel was investigated and by the Thermo-Calc software the phase diagram of 9310 steel was obtained. The results show that as-quenched 9310 steel getting a maximum tension strength value, with tempering temperature rising in the range of 100℃ to 350℃ the tension strength of 9310 steel gradually decline, but above 350℃ which rapidly fall down. The yield strength of 9310 steel first rise up to peak value at temperature of 250℃ to 350℃, then decline. The impact energy rise up to a maximum value at 250℃ and it fall down to a minimum value at temperature of 350℃ to 450℃. After tempering at 150℃ to 250℃ fine ε-carbides are precipitated in martensite lath and 9310 steel has the optimal combination of strength and toughness.