Heat treatment technology method for improving obdurability of high-speed steel

A process method and technology of strength and toughness, applied in the field of heat treatment of high-speed steel parts, can solve the problems of not having both strength and toughness, not having the best comprehensive performance, etc., so as to achieve the change of strength and toughness, the improvement of mechanical properties, and the improvement of service performance. and longevity effects

Inactive Publication Date: 2013-08-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The above two final treatment methods make the strength and toughness of the material unable to have both under the conventional treatment process.
Not the best overall performance

Method used

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  • Heat treatment technology method for improving obdurability of high-speed steel
  • Heat treatment technology method for improving obdurability of high-speed steel
  • Heat treatment technology method for improving obdurability of high-speed steel

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Experimental program
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Effect test

Embodiment

[0017] The stirring head made of W6Mo5Cr4V2Al high-speed steel is preheated by spheroidizing annealing on the material blank. The method is: heating to 950°C and keeping it for 1-2h, then lowering it to 740-780°C and keeping it for 3-5h, and finally cooling it to 550°C out of the furnace air cooled. After the main mechanical processing and forming are completed, the final heat treatment is carried out: preheating at 850-900°C, heating to 1230°C for austenitization, transferring to the lower bainite transformation temperature of 230-250°C for 1-1.5 hours, oil quenching; Then undergo cryogenic treatment at -160~-190°C for 24 hours, and then undergo secondary cycle treatment: heat preservation at 550~570°C for 1 hour, oil cooling to room temperature + cryogenic treatment; finally tempering at 550~570°C for 1~2 hours.

[0018] The technical parameters of the obtained W6Mo5Cr4V2Al high-speed steel stirring head mechanical properties and service performance are as follows:

[0019]...

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Abstract

The invention discloses a heat treatment technology method for improving the obdurability of high-speed steel. The method comprises the following steps: carrying out isothermal spheroidizing pretreatment on high-speed steel pieces, and carrying out isothermal quenching, step quenching, subzero treatment and tempering composite final heat treatment. After the isothermal spheroidizing pretreatment,machining is convenient to carry out, and organization preparation is made for subsequent quenching treatment; final heat treatment is carried out after preheating treatment and comprises the following steps: carrying out oil quenching at the lower bainite transformation temperature; then carrying out subzero treatment for 24 hours or above; and carrying out secondary circulation treatment: carrying out step quenching at 520-600DEG C and subzero treatment; and finally, and carrying out heat insulation for 1-2 hours at 520-600DEG C.

Description

technical field [0001] The invention belongs to the technical field of heat treatment technology for high-speed steel parts. Background technique [0002] High-speed steel has high hardness, red hardness and wear resistance, and has been widely used in the manufacture of various cutting tools. In addition, it is also used in the manufacture of cold and hot molds, rolls, high-temperature bearings and Special mechanical parts with high hardness, high precision, heat resistance and wear resistance. In the context of modern mechanized mass production, high-speed steel plays a role in promoting the development of industry with the development of science and technology and the improvement of industrial production level. [0003] In the existing technology, the commonly used heat treatment methods for high-speed steel parts are annealing pretreatment and quenching or austempering + multiple tempering final heat treatment. [0004] The annealing method adopts complete annealing, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D1/20C21D1/32C21D6/04
Inventor 董立新周友龙刘力菱
Owner SOUTHWEST JIAOTONG UNIV
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