Microstructure analysis and rolling contact fatigue surface hardening characteristics of high manganese steel used for railway crossing

doi:10.13251/j.issn.0254-6051.2020.11.046

Abstract

Abstract: Rolling contact fatigue characteristics of high manganese steel specimen for railway crossing were analyzed by means of metallographic microscope (OM), transmission electron microscope (TEM) and X-ray diffractometer (XRD). The results show that the maximum hardness of fatigue surface of the high manganese steel is 580-690 HV0.3, and the depth of hardening layer is 1-2 mm. The hardening mechanism is mainly twins, dislocation and stacking fault. Lacking of impact load is the major reason that why the hardening law is different from that under the actual service condition of high manganese steel railway crossing. At 100 ℃ and under the contact stress of 1800 MPa for 3.5×10⁶ cycles, aging of high manganese steel occurs and the precipitated carbide is Fe_0.6Mn_5.4C₂ with body center structure. The existence of contact stress reduces the temperature of carbide precipitation needed in high manganese steel, which indicates that the increase of additional mechanical energy can reduce the required thermal energy relatively.

Key words: railway crossing, high manganese steel, rolling contact fatigue, hardening, aging

CLC Number:

TG142.1

Yang Shuai. Microstructure analysis and rolling contact fatigue surface hardening characteristics of high manganese steel used for railway crossing[J]. Heat Treatment of Metals, 2020, 45(11): 239-242.

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