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Precipitation hardening stainless steel PH17-4 negative temperature gradient aging heat treatment method

An aging heat treatment and precipitation hardening technology, applied in the field of aging heat treatment, can solve the problem of not being able to give full play to the comprehensive mechanical properties, and achieve the effect of improving the comprehensive mechanical properties

Inactive Publication Date: 2016-02-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional heat treatment process cannot fully exert its good comprehensive mechanical properties when processing precipitation hardening stainless steel PH17-4 steel, and to provide a negative temperature gradient aging heat treatment method for precipitation hardening stainless steel PH17-4

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specific Embodiment approach 1

[0013] Specific embodiment one: a kind of precipitation hardening stainless steel PH17-4 negative temperature gradient aging heat treatment method of this embodiment, it is realized through the following steps:

[0014] After the precipitation hardening stainless steel is solution treated, the sample is heated to 400-650°C, and the aging treatment is carried out in the mode of negative aging temperature gradient of 16-80°C / h for 1-5h, and then air-cooled or air-cooled to room temperature, That is, the above-mentioned precipitation hardening stainless steel PH17-4 negative temperature gradient aging heat treatment is completed.

specific Embodiment approach 2

[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the sample is heated to 500°C to 620°C, and the negative aging temperature gradient is 80°C / h, the aging treatment is 1h, and then air-cooled or air-cooled to room temperature. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that the sample is heated to 500°C-620°C, and the negative aging temperature gradient is 70°C / h, and the aging treatment is 1h, and then air-cooled or air-cooled to room temperature. Others are the same as in the first embodiment.

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Abstract

The invention relates to an aging heat treatment method, in particular to a precipitation hardening stainless steel PH17-4 negative temperature gradient aging heat treatment method. The method aims at solving the problem that when a traditional heat treatment technology is used for treating precipitation hardening stainless steel PH17-4, the good comprehensive mechanical property of the steel cannot be sufficiently exerted. The method comprises the steps that when the precipitation hardening stainless steel is subjected to solution treatment, a sample is heated to 400 DEG C to 650 DEG C, aging treatment is carried out for 1-5 h in a manner that the negative aging temperature change gradient ranges from 16 DEG C / h to 80 DEG C / h, air cooling or wind cooling to the room temperature is carried out, and the method is completed. After the negative temperature gradient aging treatment of the PH17-4 steel, the tensile strength of the steel reaches 1162 MPa to 1512 MPa, the yield strength ranges from 1140 MPa to 1447 MPa, the elongation rate ranges from 10% to 14%, and the shrinkage rate of a section ranges from 55% to 65%.

Description

technical field [0001] The invention relates to an aging heat treatment method. Background technique [0002] Precipitation hardening stainless steel is a kind of high-strength steel developed to meet the development needs of aviation and aerospace industries. It is a Fe-Cr-Ni alloy, which is aged by adding elements such as Nb, Mo, Al, V, and N. The precipitation strengthening phase is precipitated to improve the strength and toughness of the alloy and stabilize the overall performance. The content of alloying elements in precipitation hardening stainless steel is relatively high, generally 20% to 30%. Among the alloying elements, Cr has the highest content and is the most important alloying element, which mainly improves the corrosion resistance of steel; Ni usually cooperates with Cr to play a role. Change the structure of stainless steel to improve its processing performance, mechanical properties and corrosion resistance to a large extent, and then add corresponding oth...

Claims

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Application Information

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IPC IPC(8): C21D6/02
CPCC21D6/02
Inventor 刘勇朱景川张钰梅韩天翼
Owner HARBIN INST OF TECH
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