无碳化物贝氏体组织中的残余奥氏体对提高贝氏体钢轨的韧塑性作出了突出贡献,为了在铁路运营时使钢轨仍保持较高的韧塑性,需要控制好贝氏体钢轨残余奥氏体的稳定性。通过对热轧空冷、热轧空冷＋低温回火贝氏体钢轨在不同环境温度下残余奥氏体稳定性的分析,回火贝氏体钢轨在不同试验温度（包括低温）条件下拉伸性能的分析,在模拟钢轨运营的试验条件下疲劳性能的分析及相应条件下残余奥氏体含量的测定,说明低温回火处理提高了贝氏体钢轨中残余奥氏体的稳定性,模拟钢轨运营的试验条件下,贝氏体钢轨中的残余奥氏体基本是稳定的。
The retained austenite in the carbide-free bainitic microstructures makes an outstanding contribution to improve the toughness and plasticity of the bainitic rail steels.In order to keeping a higher toughness and plasticity of the rail steels on operating conditions,it is necessary to control the stability of retained austenite in bainitic rail steels.Under different circumstance temperatures,the stability of retained austenite in bainitic rail steels after hot rolled and air-cooled,hot rolled and air-cooled ＋ low-temperature tempering processes were analyzed,tensile properties at different test temperatures,including at low temperatures,and fatigue properties under the simulating rail＇s operating test conditions were also analyzed,combining with the determination of the volume of residual austenite on corresponding conditions,the test results indicates that the low-temperature tempering processes enhances the stability of retained austenite in bainitic rail steels.Under the simulating rail＇s operating test conditions,the residual austenite in the bainitic rail steels is basically stable.
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