ZrN单层、多层、梯度层及复合处理层对不锈钢固体粒子冲蚀行为的影响

Influence of ZrN Monolayer,Multilayer,Gradient Film and Duplex Treatment on Solid Particle Erosion Behavior of Stainless Steel

对比研究了离子镀ZrN单层、多层、梯度层及其与离子渗氮复合处理对2Cr13马氏体不锈钢抗大小攻角固体粒子冲蚀性能的影响规律,通过硬度、韧性、结合强度、动静态承载能力等特性的综合测试与分析,探讨了表面处理层对不锈钢固体粒子冲蚀行为的作用机制.结果表明,上述4种表面改性层均显著提高了2Cr13不锈钢表面的硬度和抗微切削能力,因而有效改善了2Cr13钢抗30°小攻角固体粒子冲蚀性能.经离子渗氮层上沉积ZrN梯度层的复合处理后,其硬度由表面至基材呈梯度分布,界面应力分布连续性好,承载能力和抗塑性变形能力高,多冲疲劳性能优,能够显著提高基材抗90°大攻角固体粒子的冲蚀能力.然而,ZrN单层、多层、梯度层的抗多冲疲劳性能较差,其抗大攻角固体粒子的冲蚀能力反而不及2Cr13基材.

The influence of ZrN monolayer, multilayer, gradient film and duplex treatment of plasma nitriding combined ZrN gradient film on solid particle erosion（SPE） behavior of 2Cr13 martensite stainless steel at grazing angle and normal angle .was compared. The SPE mechanisms of these surface treatments were studied by measuring the hardness, toughness, bonding strength and supporting capacity under static and dynamical load conditions. Results show that all of the four surface treatments increased the hardness and anti-microcutting property of 2Cr13 steel surface. They hence improved the SPE resistance of the steel at 30 degree impingement angle. The duplex treatment of ZrN gradient film deposited on plasma nitrided 2Cr13 steel surface significantly improved the SPE resistance of the steel at 90 degree impingement angle because of the modified surface layer with gradient hardness distribution, con-tinuous stress profile, high supporting capacity and plastic deformation resistance and multi-impact fatigue resistance. However, the SPE resistance of ZrN monolayer, multilayer and gradient film at 90 degree impingement angle is lower than that of 2Cr13 steel, because they were not strong enough to withstand multi-impact fatigue damage.