Heat treatment process of high-speed steel

Abstract

The invention discloses a heat treatment process of high-speed steel. The heat treatment process comprises the following steps that A, annealing treatment is carried out, the annealing heat preservation time is over 3-4h; B, quenching treatment is carried out, and preheating for 1-3 times is carried out during quenching; and C, high-temperature tempering treatment is carried out. According to theheat treatment process of the high-speed steel, the preheating for 3 times is carried out in the quenching process, so that the process requirement for quenching is guaranteed, the impact toughness ofthe materials is enhanced, the tempering treatment for 3 times is carried out, and the tempering is more sufficient.

Description

technical field [0001] The invention relates to a heat treatment process for high-speed steel. Background technique [0002] In the prior art, the quenching temperature in the heat treatment process of high-speed steel is too high, resulting in overheating, which is characterized by a large amount of coarse grained carbides, sufficient dissolution, a small amount, a high degree of austenite alloying, and workpieces after quenching and tempering. Higher hardness and hot hardness, but the carbide dissolves and the grain grows at the same time, which reduces the impact toughness of the material and increases the brittleness. When the tool is used, it is easy to crack and the tempering is insufficient. The stress cannot be eliminated. Sometimes the hardness of the material is difficult to respond, but its brittleness is relatively large, and the tool is prone to chipping or cracking during use. Some data show that the tensile strength and deflection of high-speed steel with insu...

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Problems solved by technology

[0002] In the prior art, the quenching temperature in the heat treatment process of high-speed steel is too high, resulting in overheating, which is characterized by a large amount of dissolved carbides with large grains, sufficient dissolution, a small amount, a high degree of austenite alloying, and the workpiece has cracks after quenching and tempering. Higher hardness and hot hardness, but the carbide dissolves and the grain grows at the same time, which reduces the impact toughness of the material and increases the brittleness. When the tool is used, it is easy to crack and the tempering is insufficient. The stress cannot be eliminated, sometimes the hardness of the material is difficult to respond, but its brittleness is relatively large, and the tool is prone to chipping or cracking during use. Some data show that the tensile strength and deflection of high-speed steel with insufficient tempering cannot reach the most satisfactory Level