中文摘要：

为对比研究表面处理对17-4PH不锈钢抗固体粒子冲蚀性能的影响，在17-4PH不锈钢表面进行了多弧离子镀陶瓷／金属多层膜制备、激光表面合金化（LSA）处理和超音速火焰喷涂（HVOF）硬质合金层处理，利用划痕仪、自组装的不锈钢抗固体粒子冲蚀（SPE）装置、多冲疲劳试验机对上述三种表面处理试样的小攻角和大攻角SPE失效行为和机理进行了研究。结果表明，微切削是17-4PH不锈钢及其表面改性试样小攻角下固体粒子冲蚀破坏的主要失效机制，多冲型疲劳破坏是17-4PH不锈钢及其表面改性试样大攻角下固体粒子冲蚀的主要失效机制。HVOFWC-17Co涂层可显著提高17-4PH不锈钢30°小攻角和90°大攻角下SPE抗力。激光表面合金化层能够改善17-4PH不锈钢抗30°小攻角和90°大攻角下SPE性能，但SPE性能改善效果弱于HVOF喷涂涂层。TiAIN／Ti多层膜不能显著提高17-4PH不锈钢抗30°小攻角和90°大攻角的SPE性能。

英文摘要：

Multi-arc ion plating ceramic/metal multilayers, laser surface alloying coating and high velocity oxy-fuel （HVOF） spraying hard ceramics coating were prepared on 17-4PH stainless steel to study the influence of surface treatment on solid particle erosion resist- ance 17-4PH stainless steel. Then, the failure mechanism of SPE at both low and high impingement angles of 17-4PH stainless steel and three kinds of coatings was studied by surface scratches tester and small energy multi-impact test machine. The results indicate that the main failure mechanism of the SPE at low impingement angle on 17-4PH stainless steel and coatings is the micro-cuttlng mode; but at a high angle, the main mechanism is the multi-impact fatigue failure mode. The SPE resistance of 17-4PH stainless steel at 30°and 90°impingement angles is remarkably improved by the HVOF WC-17Co coating. The laser alloying coating also enhances the SPE re- sistance of 174PH stainless steel at both 30°and 90°impingement angles respectively, but the comprehensive performance of the laser alloying coating is inferior than that of HVOF WC-17Co coating. However, the TiA1N/Ti multilayer does not improve the SPE resist- ance of 17-4PH stainless steel at 30°and 90°impingement angles.