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Maraging stainless steel heat treatment method

A heat treatment method and aging treatment technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of insufficient strength and toughness, achieve high plasticity and toughness, improve tensile strength, and reduce content.

Pending Publication Date: 2022-01-28
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The heat treatment process is an important means to determine the mechanical properties and other properties of steel. The current development of maraging stainless steel is also facing a prominent problem, that is, the combination of strength and toughness is not excellent enough. How to ensure the high strength of maraging stainless steel At the same time, it has important theoretical significance and application value to study how to improve the resilience index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The grade of steel is 04Cr13Ni8Mo2Al. According to weight percentage, maraging steel stainless steel is composed of the following components: C: 0.03%, Si: 0.08%, Mn: 0.12%, Ni: 8.0%, Cr: 13.2%, Mo Al: 2.5%, Al: 1.1%, and the balance is iron.

[0019] The heat treatment method comprises the steps of:

[0020] Step A, using Thermo-Calc thermodynamic calculation software to calculate the equilibrium phase diagram of martensitic stainless steel, and determine the solid solution temperature to be 927°C;

[0021] Step B, solid solution treating the maraging stainless steel at the temperature calculated in step A for 60 minutes, and air cooling to room temperature;

[0022] Step C, in order to obtain a single fine-grained austenite structure, above AC 3 temperature at 40°C (AC 3 Temperature is 790 ℃), carry out repeated solid solution treatment, air cooling to room temperature;

[0023] Step D, performing cryogenic treatment in a cryogenic furnace, the cryogenic temperatu...

Embodiment 2

[0027] The grade of steel is 04Cr13Ni8Mo2Al. According to weight percentage, maraging steel stainless steel is composed of the following components: C: 0.03%, Si: 0.08%, Mn: 0.12%, Ni: 8.0%, Cr: 13.2%, Mo Al: 2.5%, Al: 1.1%, and the balance is iron.

[0028] The heat treatment method comprises the steps of:

[0029] Step A, using Thermo-Calc thermodynamic calculation software to calculate the equilibrium phase diagram of martensitic stainless steel, and determine the solid solution temperature to be 927°C;

[0030] Step B, solid solution treating the maraging stainless steel at the temperature calculated in step A for 60 minutes, and air cooling to room temperature;

[0031] Step C, in order to obtain a single fine-grained austenite structure, above AC 3 temperature at 60°C (AC 3 Temperature is 790 ℃), carry out repeated solid solution treatment, air cooling to room temperature;

[0032] Step D, performing cryogenic treatment in a cryogenic furnace, the cryogenic temperatu...

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PUM

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Abstract

The invention belongs to the technical field of heat treatment of stainless steel, and particularly relates to a maraging stainless steel heat treatment method. The method comprises steps: firstly, carrying out solid solution treatment, dissolving precipitates fully into a matrix until chemical components are uniform and consistent, then rapidly cooling, and obtaining a single or uniform martensite structure; meanwhile, in order to obtain a single fine grain austenite structure, carrying out repeated solution treatment under the temperature condition of 40-60 DEG C higher than the AC3 temperature; considering that the nickel or cobalt content of some maraging steel is high, and air cooling or water cooling cannot ensure that austenite is completely converted into martensite, adopting a subzero treatment link, and reducing the content of retained austenite; and finally, during aging treatment, separating a strengthening phase out on a martensite matrix, so that the tensile strength of the steel is improved, and meanwhile the plasticity and toughness are maintained at a high level.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of stainless steel, in particular to a heat treatment method for maraging stainless steel. Background technique [0002] With the further development of my country's aerospace industry, higher requirements are put forward for the performance of structural materials used in special environments. Due to the continuous research and development and substitution of new aviation materials (such as aluminum-magnesium alloys, advanced composite materials, titanium alloys), the proportion of steel used in aircraft has been declining. However, high-performance structural steel and stainless steel, with their advantages of high strength, high toughness, fatigue performance and high purity, will still be the key to the new generation of aircraft such as high-stress fasteners, landing gear and girders for some time to come. Important candidate materials for structural parts. In the field of civil avia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D6/04C22C38/02C22C38/04C22C38/44C22C38/06C21D11/00
CPCC21D6/005C21D6/004C21D6/008C21D6/04C22C38/02C22C38/04C22C38/44C22C38/06C21D11/00C21D2211/008
Inventor 白青青张志宏王英虎柏川
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD