H13钢在不同环境介质中的磨损性能

Friction and Wear Behavior as well as Wear Mechanism of H13 Steel in Different Environment

金属材料在不同介质中的腐蚀磨损特性不同,以往对H13钢在不同介质中的腐蚀行为研究较少。采用销盘式磨损试验机,对H13钢在空气、蒸馏水、3.5%Na Cl溶液、5.0%Na OH溶液中及不同载荷下进行滑动摩擦磨损试验,考察其磨损特性。结果表明:H13钢在空气中的磨损率最大,3.5%Na Cl溶液中的磨损率最小;H13钢在空气中摩擦过程中具有较大的剪切力并产生较大的热量,使其磨损率较大,其主要磨损机制为黏着磨损,并伴有少量氧化物产生;在3种湿环境下,由于介质具有良好的润滑和冷却作用,且表面含有少量氧化物,呈现轻微磨损;蒸馏水中磨损机制为典型的疲劳磨损,3.5%Na Cl溶液、5.0%Na OH溶液中呈现腐蚀疲劳磨损。

A pin-on-disc friction and wear tester was performed to evaluate the friction and wear behavior of H13 steel under dry sliding and the lubrication of distilled water,3. 5% Na Cl solution and 5. 0%Na OH solution. The worn surface morphology of the steel was observed with a scanning electron microscope,and its wear mechanism was discussed. Results indicated that H13 steel exhibited the highest wear rate under dry sliding,which was because the steel underwent relatively high shear force as well as a large amount of friction-induced heat therewith,and the major wear mechanism was adhesion wear in association with the generation of a small amount of oxides on steel surface. Under the lubrication of 3. 5% Na Cl solution,the steel exhibited the lowest wear rate. Therefore,under the lubrication of the three kinds of liquid,the H13 underwent slight wear,accompanied by the generation of a small amount of oxides on the surface,which was because the lubricant liquid exhibited good cooling and lubricating capabilities. Moreover,the steel was dominated by typical fatigue wear under the lubrication of distilled water,while it was dominated by corrosion fatigue wear under the lubrication of 3. 5% Na Cl solution and 5. 0% Na OH solution.