{"id":30555,"date":"2021-07-11T10:48:26","date_gmt":"2021-07-11T10:48:26","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=30555"},"modified":"2023-09-20T06:04:29","modified_gmt":"2023-09-20T06:04:29","slug":"surface-hardness-and-wear-resistance","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-engineering\/metals-what-are-metals\/failure-modes-of-materials\/wear\/surface-hardness-and-wear-resistance\/","title":{"rendered":"Surface Hardness and Wear Resistance"},"content":{"rendered":"
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\"wear\"In general, wear<\/strong> is mechanically induced surface damage that results in the progressive removal of material due to relative motion between that surface and a contacting substance or substances. A contacting substance may consist of another surface, a fluid, or hard, abrasive particles contained in some form of fluid or suspension, such as a lubricant. As is with friction, the presence of wear can be either good or bad. Productive, controlled wear can be found in processes like machining, cutting, grinding, and polishing. However, in most technological applications, the occurrence of wear is highly undesirable, and it is an enormously expensive problem since it leads to the deterioration or failure of components. In terms of safety, it is often not as serious (or as sudden) as a fracture, and this is because the wear is usually anticipated.<\/p>\n

Certain material characteristics such as hardness<\/strong>, carbide type, and volume percent can have a decided impact on the wear resistance of a material in a given application. Wear<\/strong>, like corrosion, has multiple types and subtypes that are predictable to some extent and are rather difficult to test reliably and evaluate in the lab or service.<\/p>\n

Surface Hardness and Wear Resistance<\/h2>\n

Hardness<\/a><\/strong> is important from an engineering standpoint because resistance to wear<\/strong> by either friction or erosion by steam, oil, and water generally increases with hardness. If the hardness of the material is higher than that of the abrasive material, less wear rate will occur.<\/p>\n

Case hardening<\/strong><\/a> or surface hardening is the process in which the hardness of an object\u2019s surface (case) is enhanced while the inner core of the object remains elastic and tough. After this process enhances surface hardness, wear resistance, and fatigue life. This is accomplished by several processes, such as a carburizing or nitriding process by which a component is exposed to a carbonaceous or nitrogenous atmosphere at elevated temperatures. As was written, two main material characteristics are influenced:<\/p>\n