0Cr17Ni7Al沉淀硬化不锈钢的冲蚀磨损性能研究

Research on Erosive Wear Resistance of Precipitation Hardening Stainless Steel 0Cr17Ni7Al

采用自制液固两相流冲蚀磨损试验机研究了0Cr17Ni7Al的冲蚀磨损性能及热处理工艺的影响,并与硬度大小相近的H13钢进行对比分析,探讨了其冲蚀磨损机理。结果表明:经1 040℃固溶+520℃时效后的0Cr17Ni7Al的抗冲蚀性能最好;因材料加工硬化的作用,冲蚀失重率随冲蚀时间的增加先增大后保持在稳定值;冲蚀角度对材料冲蚀失重具有明显影响,在15°~90°范围内,失重量随冲蚀角度的增加先增大后减小,45°时达到极大值;低角度下0Cr17Ni7Al钢冲蚀性能远优于H13钢,冲蚀极大值基本相等。通过表面冲蚀形貌的观察发现,本试验条件下浆体对材料的冲蚀机制主要为挤压推出。因此,高强度和高硬度有利于提高0Cr17Ni7Al钢的抗冲蚀磨损性能。

Erosive wear resistance of precipitation hardening steel 0Cr17Ni7Al was investigated via self-made solid-liquid two-phase-flow erosive wear tester,and the effect of heat treatment on the erosive wear resistance of the steel was studied. Furthermore,through comparison with H13 steel which has the similar hardness with the steel,its erosive wear mechanism was also discussed. The experimental results show that the specimens undergone solid solution treatment at 1 040 ℃ and aged at 520 ℃ present the best erosive wear resistance. As erosive time increases,the weight loss ratio of steel 0Cr17Ni7Al increases first and then keeps at a stable value,showing a noticeable influence by work hardening rate and erosive angle. As the erosive angle increases from 15° to 90°,the weight loss due to erosive wear increases first and then decreases with the maximum value at 45°. Steel 0Cr17Ni7Al has better wear-resistant properties at small angles than H13 steel while they have basically the same erosion maximum. Based on surface morphology observation,the erosive wear mechanism of slurry on materials in the research is mainly extrusion. Therefore,higher strength and hardness is beneficial for improving erosive wear resistance.