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利用X射线衍射分析(XRD)、光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)等研究了930℃加热空冷及930℃加热水冷-空冷交替冷却对■53 mm无碳化物贝氏体钢20SiMn3MoV组织和力学性能的影响。结果表明:930℃加热空冷处理后,实验钢的组织较粗大,为贝氏体铁素体(BF)和分布在贝氏体铁素体板条之间的残留奥氏体(AR)组织,晶粒度等级为6.5～7.5级,抗拉强度为1288 MPa,-40℃冲击吸收能量为22.8 J。经930℃加热水冷-空冷交替冷却处理后(先水冷到400～450℃后空冷),实验钢的组织细小,为贝氏体铁素体(BF)和分布在贝氏体铁素体板条之间的残留奥氏体(AR)组织,晶粒度等级为7.5～8.0级,抗拉强度为1393 MPa,-40℃冲击吸收能量为38.8 J,表明水冷-空冷交替冷却工艺细化了实验钢的晶粒,提高了实验钢的强度及韧性,与930℃加热空冷相比,实验钢的强度提高了8.2%,低温韧性提高了70%。
Abstract：The effects of normalizing at 930 ℃ with air-cooling and normalizing at 930 ℃ with alternate water cooling and air-cooling on microstructure and mechanical properties of carbide-free bainitic steel 20 SiMn3 MoV were studied by means of X-ray diffraction(XRD), optical microscope(OM), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that after normalizing at 930 ℃ with air cooling, the microstructure of the experimental steel is coarse, and composed of bainite-ferrite(BF) and retained austenite(AR) distributed between the bainite-ferrite lath, the grain size grade is 6.5-7.5, the tensile strength is 1288 MPa, and the impact absorption energy at-40 ℃ is 22.8 J. After normalizing at 930 ℃ followed by alternate water cooling and air-cooling(first water-cooling to 400-450 ℃ and then by air cooling), the microstructure of the experimental steel is fine, and composed of bainite-ferrite(BF) and retained austenite distributed between the bainite-ferrite lath, the grain size grade is 7.5-8.0, the tensile strength is 1393 MPa, and the impact absorption energy at-40 ℃ is 38.8 J, indicating that the alternate water-cooling and air-cooling process can refine the grains of the experimental steel and improve the strength and the toughness. Compared with that after normalizing at 930 ℃ with air-cooling, the tensile strength and the low-temperature impact toughness of the steel after normalizing at 930 ℃ with alternate water cooling and air-cooling increase by 8.2% and 70%, respectively.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2019-0429
中图分类号:TG161
引用信息:
[1]程彦,程巨强.改善大截面20SiMn3MoV贝氏体钢组织和性能的热处理工艺[J],2020,41(04):151-157.DOI:10.13289/j.issn.1009-6264.2019-0429.
基金信息: