二次硬化超高强度钢的高周疲劳性能研究
来源期刊:钢铁2011年第2期
论文作者:廉学魁 王春旭 刘宪民 厉勇 李建新 严晓红
文章页码:69 - 73
关键词:二次硬化; 高周疲劳; S-N曲线; AF1410钢
Key words:secondary hardening; high-cycle fatigue; S-N curve; AF1410 steel
摘 要:研究了采用真空感应+真空自耗重熔工艺冶炼的高纯净二次硬化超高强度AF1410钢的高周疲劳和疲劳裂纹扩展性能。结果表明:高纯净度AF1410钢具有优异的强韧性配合和较高的抗疲劳裂纹扩展能力,应力比R为0.1时,其光滑(Kt=1)和缺口(Kt=3)疲劳强度分别为1 375MPa和417MPa,且疲劳裂纹源均起始于试样表面缺陷;回火温度对该钢的疲劳裂纹门槛值影响显著。
Abstract: High-cycle fatigue properties and fatigue crack growth behavior of high clean secondary hardening ultra-high strength steel(AF1410),which was made by vacuum induction melting followed by vacuum arc remelting(VIM-VAR),have been studied.The experimental results indicate that high clean AF1410 steel has excellent combination of strength and toughness and high resistance on fatigue crack growth.Fatigue strength of smooth specimen(R=0.1,Kt=1) and notch specimen(R=0.1,Kt=3) reaches 1 375 MPa and 417 MPa.Fatigue cracks all initiates from specimen surface.Tempering temperature remarkably affects the threshold value of fatigue crack propagation.
廉学魁1,王春旭1,刘宪民1,厉勇1,李建新2,严晓红2
(1.北京市钢铁研究总院结构材料研究所
2.抚顺特殊钢股份有限公司,辽宁抚顺 113001)
摘 要:研究了采用真空感应+真空自耗重熔工艺冶炼的高纯净二次硬化超高强度AF1410钢的高周疲劳和疲劳裂纹扩展性能。结果表明:高纯净度AF1410钢具有优异的强韧性配合和较高的抗疲劳裂纹扩展能力,应力比R为0.1时,其光滑(Kt=1)和缺口(Kt=3)疲劳强度分别为1 375MPa和417MPa,且疲劳裂纹源均起始于试样表面缺陷;回火温度对该钢的疲劳裂纹门槛值影响显著。
关键词:二次硬化; 高周疲劳; S-N曲线; AF1410钢