However, with greater toughness of steel crack growth can be slowed down the pace. The third stage, the rapid expansion of crack. When the crack reach this stage, bearing soon will expire. 3. Surface treatment based on fracture toughness and other materials crack and the relationship between the development of research and analysis, we can easily see the value in dn high stress and there is the circle of circumstances, the high-speed steel surface treatment and low carbon content of the High-speed steel hardening the surface of the depth of change is of great significance. To that end, SKF developed surface treatment process, to enhance the surface hardness, and produce stress. The surface of the material has the following characteristics: a better anti-fatigue cracks, the second phase, the crack growth rate has been low and inadequate or hardening of low carbon content of the core led to the fracture toughness of the material, and other high value . SKF development Ball Bearing of such a surface treatment processing methods include: (1) using lasers, electron beams or induction quenching methods such as hardening of the general shortage of local high-speed steel heat treatment to be hardened surface layer. It should be noted that the shortage is to increase quenching fracture toughness. (2) to use chemical heat treatment method hardened surface layer. Such methods include carbon or nitrogen will penetrate into the ordinary high-speed steel microstructure, or small degree of change in carbon content. In short, SKF considered for the next generation of aero-engine in the development of new or improved methods of steel heat treatment process, the surface can be dealt with the effects of the considerable benefits. It can be said that if the heat treatment means that the development of the microstructure and mechanical properties of the people once they are in total control, hardenability steel and high speed steel in the aero-engine bearings will be fully utilized.
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