What is the effect of heat treatment process on the strength of NM400 wear-resistant plate?

Different heat treatment processes have the following effects on the strength of NM400 wear-resistant plate:

1、 Quenching process Increase intensity: Quenching can give NM400 wear-resistant plate a martensitic structure, which has high hardness and strength. By rapid cooling, carbon atoms do not have time to diffuse and form supersaturated solid solutions, resulting in lattice distortion and significantly improving the strength of the material.

2、 Tempering process Adjust the balance between strength and toughness: Tempering is a heat treatment process carried out after quenching. Tempering can reduce the internal stress generated by quenching, improve the toughness of materials, and to some extent adjust the strength. As the tempering temperature increases and the tempering time prolongs, martensite gradually decomposes, carbides precipitate and aggregate, and the strength of the material gradually decreases, but the toughness improves. 

3、 Normalization process Refining grain size to improve strength: Normalization can homogenize the microstructure and refine the grain size of NM400 wear-resistant plate. Refined grains can improve the strength and toughness of materials. Normalization usually involves heating the wear-resistant plate to a temperature slightly higher than Ac3 (hypoeutectoid steel) or Accm (hypereutectoid steel), holding it for a period of time, and then cooling it in air. 

4、 Annealing process Reduce strength to improve processing performance: Annealing is mainly used to reduce the hardness and strength of materials, improve their plasticity and toughness, and enhance their processing performance. During the annealing process, the material undergoes recovery and recrystallization, eliminating work hardening and internal stress, and stabilizing the structure. Annealed wear-resistant plates can be used in situations where strength requirements are not high, but are generally not suitable for working conditions that require high strength. In summary, different heat treatment processes have different effects on the strength of NM400 wear-resistant plates. Suitable heat treatment processes can be selected according to specific usage requirements and working conditions to obtain the required strength and other properties.

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