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氣體滲氮對中碳車軸鋼超長壽命疲勞性能的影響

Effect of gas nitriding on the fatigue properties of medium carbon railway axle steel in a very high cycle regime

  • 摘要: 研究了氣體滲氮在材料表面層由表及里逐次形成的氧化物層、氮化物層及N固溶層對中碳車軸鋼超長壽命旋轉彎曲疲勞性能的影響.與未處理試樣相比,帶有氧化物層、去除氧化物層及去除氮化物層的滲氮試樣的疲勞強度逐級提高.去除氧化物層和去除氮化物層的試樣在超長壽命區分別發生次表面和內部破壞.通過斷口觀察和斷裂分析,闡明了滲氮處理材料的表面層對超長壽命疲勞性能的影響.

     

    Abstract: After gas nitriding three layers are formed on the surface of medium carbon railway axle steel from the exterior to interior,they are oxide layer,nitride layer and N-diffusion layer respectively.The effect of the three surface layers on the rotary bending fatigue properties of the steel was investigated in a very high cycle regime.Compared with the fatigue strength of untreated specimens,the strengths of nitrided specimens with the oxide layer,the specimens from which the oxide layer was removed and the specimens from which the nitride layer was removed greatly increased step by step.Nitrided specimens without the oxide layer fractured from the position between the compound layer and diffusion layer at the subsurface;while the ones without both the oxide and nitride layers fractured from the matrix.Through fractography and fracture analysis,the effect of the three surface layers on the fatigue properties was clarified in a very high cycle regime.

     

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