Austenite transformation of NM500 wear-resistant steel

NM500 wear-resistant steel is a high-performance abrasion-resistant steel developed by Beijing Baosteel Group Co., Ltd. It is usually used in harsh working environments such as mining, cement plants and other areas that require high wear resistance. The properties of NM500 make it an ideal material for structural components, container plates and shells, and the like. It is well known that austenitic transformation can significantly improve the wear-resisting performance of NM500. It is imperative to discuss the effect of austenite transformation on the performance of NM500 and its process.
    
Austenite transformation refers to the process in which austenite is formed from ferrite matrix under certain heat treatment technology. It provides a compact structure for steel without metal flow or phase transition, and the transformation of NM500 steel is no exception. After transformation, the hardness of NM500 steel is significantly increased. The figure below shows the effect of austenite transformation on the hardness of NM500 steel.
       
Austenite transformation also increases the strength, toughness and wear-resistance of NM500. The figure below illustrates the effect of austenite transformation on the strength and toughness of NM500.
 
    
Austenite transformation of NM500 steel can also improve its oxidation resistance. During austenite transformation, the surface of steel transforms from a multiphase structure to a single-phase structure, which improves the sealing of steel surface, thereby reducing oxidation. The benefits of austenite transformation on corrosion resistance are demonstrated in the following figure.
    
The process of austenite transformation of NM500 steel involves several stages. Firstly, the preheating temperature of the workpiece should be controlled, then after nitrogen protection and preheating, the steel should be subjected to warm austenitization treatment to complete the transformation. After transformation, the workpiece should be quenched, air cooled, and tempered to obtain a rational combination of strength, toughness and wear resistance.
    
In conclusion, the austenite transformation of NM500 steel can effectively improve its properties and make it suitable for use in harsh working conditions. The preheating temperature and other parameters should be strictly controlled during the entire process.

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