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High-speed steel heat treatment technology

A technology of high-speed steel and process, which is applied in the field of heat treatment process of high-speed steel, can solve the problems of tool chipping, insufficient tempering, and reduce the impact toughness of materials, and achieve the effect of ensuring process requirements, sufficient tempering, and enhancing impact toughness

Inactive Publication Date: 2017-05-31
格润德(青岛)新型环保建材有限公司
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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

Method used

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Embodiment Construction

[0013] The heat treatment process of high-speed steel, the heat treatment process of high-speed steel, includes the following steps: A. Perform annealing treatment. The annealing holding time should be more than 3-4h. , can also be cooled to 740-760 ° C for 4-6 hours, and cooled to below 600 ° C isothermal annealing method; B, quenching treatment, 1-3 times of preheating during quenching, in step B, the first preheating The heat is low-temperature preheating, the low-temperature preheating temperature is 450-500°C, and the heat preservation is 1-1.5min / mm. In step B, the second preheating is medium-temperature preheating. 1.0min / mm; C, perform high temperature tempering treatment, at least three tempering treatments in step C, the first tempering can only temper the quenched martensite; the second tempering can only temper the martensite Tensile body is tempered, and internal stress is eliminated and brittleness is reduced; the third tempering hardness does not drop but rises,...

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Abstract

The invention discloses a high-speed steel heat treatment technology. The heat treatment technology includes the following steps that A, annealing treatment is performed, and annealing holding time should be 3-4h or above; B, quenching treatment is conducted, and preheating is performed for 1-3 times in the quenching process; and C, high-temperature tempering treatment is carried out. According to the high-speed steel heat treatment technology, preheating is performed for three times in the quenching process, the quenching technological requirements are guaranteed, impact toughness of a material is enhanced, and tempering is made more sufficient by means of tempering treatment for three times.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D6/00
CPCC21D1/18C21D1/26C21D6/00
Inventor 黄亚楠
Owner 格润德(青岛)新型环保建材有限公司
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