Possibility of Fatigue Life Increase of Rail Steel by Electron Beam Treatment

摘要：

　　The investigations of phase composi tion, structure and defect substructure of rail steel sub jected to electron beam irradiation in different regimes (electron energy W =18 keV, energy density ES =(10 ...30) J/cm2, exposure time τ =50 ps and repetition frequency of an electron beams f =0.3 s-1 ; quantity of impulses N =3) and fatigue loading up to fracture have been carried out by methods of scanning and transmis sion electron microscopy.It is shown that in high-speed heating and cooling conditions at melting regime (10 J/cm2, 50 μs, 3 impulses, 0.3 S-1) in steel surface layer (~ 0.5...1.0 μm) microinhomogeneous structure phase state is formed, presented by grains of α-phase with cells of crystallization in which volume nanosizem artensite crystals and grains of α-phase with martensite crystals of submicronic range are formed.In the layer of thermal influence located in temperature interval of α -phase, a γ-phase and iron carbide coexistence, the muitiphase morphologically multicomponent structure is formed.The regime of rail steel surface processing by high intensive electron beams, allowingto increasethe fatigue life (by ~ 2.5 times) has been revealed.Thefat igue life increase of the steel treated by electron beams is caused by the formation of a needle shape profile of the boundary separation leading to dispersion of stress concentrators and providing more homogeneous plastic flow in substrate.

关键词： rail steel structure phase composition electron beams fatigue life

作者: V.E.Gromov Y.F.Ivanov V.A.Grishunin S.V.Konovalov D.E.Proklushina N.S.Derbicheva

作者单位: Siberian State University of Industry Novokuznetsk,Kirov str.,42,654007,Kemerovo region,Russian Federation

会议类型: 国际会议

会议名称: The 12th China-Russia Symposium on Advanced Materials and Technologies(第十二届中俄双边新材料新工艺国际会议)

会议地点: 昆明

会议语种:英文

页码: 255-259

在线出版日期: 2013-11-19（万方平台首次上网日期，不代表论文的发表时间）