磨料水射流喷丸对渗碳GDL-1钢表面完整性及疲劳性能的影响
发布时间：2019-06-17 18:21
【摘要】：为研究后混合磨料水射流喷丸对渗碳后GDL-1钢表面完整性及疲劳性能的影响规律,利用X射线应力衍射仪、粗糙度仪、显微硬度仪、金相显微镜、扫描电镜、透射电镜等分析了水射流喷丸强化对试样表面残余应力场、粗糙度、硬度、形貌、组织的变化规律,并用升降法测定了抛光及抛光+水喷丸两种状态下渗碳GDL-1钢拉压疲劳性能。结果表明:试样经水喷丸处理后,表面粗糙度有所增加,并且有磨料撞击形成的小凹坑及在表面残留有玻璃磨料,但同时表层脱碳层大部分被去除,硬度得到显著提升、残留奥氏体含量降低,晶粒得到细化,并且在表面形成一定深度的残余压应力层。经水喷丸处理的试样,其较未经水喷丸的疲劳极限提高了19%,且疲劳源全部在远离表面接近1/2R位置形成,这说明水射流喷丸在表层产生的高残余压应力和晶粒细化可以显著提高渗碳钢的疲劳性能。
[Abstract]:In order to study the effect of mixed abrasive water jet shot peening on the surface integrity and fatigue properties of GDL-1 steel after carburization, the changes of residual stress field, roughness, hardness, morphology and microstructure on the surface of GDL-1 steel were analyzed by means of X-ray stress diffractometer, roughness meter, microhardness meter, metallographic microscope, scanning electron microscope and transmission electron microscope. The tensile and compressive fatigue properties of carburized GDL-1 steel under polishing and polishing water shot peening were measured by lifting method. The results show that after water shot peening treatment, the surface roughness of the sample increases, and there are small pits formed by abrasive impact and glass abrasive on the surface, but at the same time, most of the decarbonization layer on the surface is removed, the hardness is significantly increased, the retained Austenite content is decreased, the grain is refined, and a certain depth residual compressive stress layer is formed on the surface. The fatigue limit of the samples treated by water shot peening is 19% higher than that of the samples without water shot peening, and all the fatigue sources are formed at a position close to 1 鈮，
本文编号：2501170
[Abstract]:In order to study the effect of mixed abrasive water jet shot peening on the surface integrity and fatigue properties of GDL-1 steel after carburization, the changes of residual stress field, roughness, hardness, morphology and microstructure on the surface of GDL-1 steel were analyzed by means of X-ray stress diffractometer, roughness meter, microhardness meter, metallographic microscope, scanning electron microscope and transmission electron microscope. The tensile and compressive fatigue properties of carburized GDL-1 steel under polishing and polishing water shot peening were measured by lifting method. The results show that after water shot peening treatment, the surface roughness of the sample increases, and there are small pits formed by abrasive impact and glass abrasive on the surface, but at the same time, most of the decarbonization layer on the surface is removed, the hardness is significantly increased, the retained Austenite content is decreased, the grain is refined, and a certain depth residual compressive stress layer is formed on the surface. The fatigue limit of the samples treated by water shot peening is 19% higher than that of the samples without water shot peening, and all the fatigue sources are formed at a position close to 1 鈮，
本文编号：2501170
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