![]() ![]() On the other hand, low carbon could manage fatigue but marks would soon show on the surface. Figure 1a Figure 1bĪlthough high-carbon steel would bring the requested surface toughness, fatigue properties would likely not be acceptable. To avoid both damage of the surface and fatigue cracks, hardness on the surface and ductility in the core of the material are required. This component will have to sustain continuous loading and unloading cycles generated by the contact with another moving metallic (hard) part (see Figure 1A). The bevel gear is a typical mechanical part produced in large quantities. This article presents two examples to illustrate the carburizing and nitriding heat treatment processes. The simulation of this process is helpful for the engineer to optimize the process. The nitriding process uses the same concept but with nitrogen instead of carbon. While the carbon content (%C) is fairly known at the locations where the carbon has diffused, it is harder to anticipate how far the carbon has diffused. By adjusting the parameters such as temperature and time, the carbon will diffuse into the part to a certain thickness. Carburizing is a process where the part is placed in a confined environment regulated by its carbon content. (Photo courtesy of Advanced Heat Treat Corp.)Ĭarburizing and nitriding treatments have the same goal: increase hardness on the surface while keeping the core ductility.
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