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Heat treatment process for obtaining high elongation and high toughness of steel

A high elongation, high toughness technology, applied in the field of heat treatment, can solve the problems of affecting wear resistance, toughness ability not reaching the target, etc., to achieve the effect of improving wear resistance, facilitating popularization and application, and reducing quenching stress

Pending Publication Date: 2021-07-23
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a heat treatment process for steel to obtain high elongation and high toughness, so as to solve the existing problems: the bainitic steel currently on the market still has problems in the toughness control mechanism, and the medium carbon steel is converted to Generally, direct austempering is used for bainite, which fails to reach the target toughness and affects its wear resistance

Method used

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts all belong to the protection scope of the present invention.

[0020] The invention is a heat treatment process for steel to obtain high elongation and high toughness, comprising the following steps:

[0021] S1: For the first heating, the medium carbon steel bar is heated at a high temperature to realize the austenitization of the test steel;

[0022] S2: After complete austenitization, oil quenching is carried out to obtain the initial martensite structure, and the first heating process is completed;

[0023] S3: carry out secondary heati...

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Abstract

The invention discloses a heat treatment process for obtaining high elongation and high toughness of steel. The heat treatment process comprises the following steps: heating medium carbon steel at high temperature, completely austenitizing, and performing oil quenching to obtain an initial martensite structure; and performing secondary heating until the temperature of an austenite-ferrite two-phase region is reached, performing heat preservation for a certain time, performing isothermal transformation in a bainite phase region, and finally obtaining a ferrite, bainite ferrite and retained austenite complex phase structure. Compared with bainite formed through direct equal quenching, the toughness is doubled, the toughness of medium carbon steel is greatly improved, the wear resistance is improved, and application and popularization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, in particular to a heat treatment process for obtaining high elongation and high toughness of steel. Background technique [0002] After austenitization, the steel is supercooled to below the pearlite transformation temperature range, and the middle temperature range above the martensite transformation temperature range is transformed from bainitic ferrite, retained austenite and dispersed carbonization. However, there are still problems in controlling the toughness mechanism of bainite steels currently on the market. Direct austempering is generally used to convert medium carbon steels into bainite. Its toughness ability does not reach the target and affects its wear resistance. Contents of the invention [0003] The purpose of the present invention is to provide a heat treatment process for steel to obtain high elongation and high toughness, so as to solve the existing problems: the b...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/46C21D1/50C21D6/00C21D9/00C21D11/00C22C38/02C22C38/04C22C38/18
CPCC21D1/18C21D1/50C21D1/46C21D6/005C21D6/008C21D9/0075C22C38/02C22C38/04C22C38/18C21D6/002C21D11/00C21D2211/005C21D2211/002C21D2211/001C21D2211/008
Inventor 龙晓燕尹东鑫杨志南张福成
Owner YANSHAN UNIV
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