Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel

A technology of austenitic heat-resistant steel and heat treatment method, applied in the field of heat treatment, can solve the problem of difficulty in obtaining high-density nano-strengthening, and achieve the effects of good high-temperature strengthening effect, good high-temperature corrosion resistance and high thermal stability.

Inactive Publication Date: 2010-12-15
SHANDONG UNIV OF TECH
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Problems solved by technology

However, for austenitic heat-resistant steels, it is not easy to obtain high-density nano-strengthened phases due to the absence of phase transformation and the formation of high-density dislocation substructures during the cooling process.
Currently, there is no documented method to obtain high-density and uniformly distributed nanostrengthening phases in austenitic heat-resistant steels

Method used

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  • Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel
  • Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel
  • Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel

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Embodiment Construction

[0012] The chemical composition of HR3C austenitic heat-resistant steel used in the test is shown in Table 1. The HR3C steel piece is obtained through smelting, thermal processing and cold processing, and then heat treated according to the heat treatment method of the present invention, and the heat treatment process parameters are shown in Table 2. Part of the heat-treated HR3C steel piece is processed into a metallographic sample, and the morphology of the strengthening phase is observed under the FEI Sirion scanning electron microscope, and the number of nano-reinforcement phase particles contained in each square micron area is measured, and part of it is processed into a standard durable sample Endurance tests were carried out on the CSS-3905 electronic creep endurance tester. According to the enduring test results, the enduring strength at 700°C and 100,000 hours was estimated by the Larson-Miller parameter method. Table 2 lists the number of particles of the nano-reinfor...

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Abstract

The invention discloses a thermal treatment method for obtaining a nanometer strengthening phase by HR3C austenitic heat-resistance steel. The thermal treatment method comprises two steps as follows: firstly, solution treatment: heating a steel member to 1170-1250 DEG C for 30-60min, and then cooling water to the room temperature; and secondly, annealing treatment: heating the steel member after solution treatment to 800-950 DEG C for 30-240min, and then cooling air to the room temperature. In the HR3C austenitic heat-resistance steel treated by using the thermal treatment method, high-density NbCrN-type nanometer strengthening phases with the size ranging from 20 nm to 60 nm are evenly distributed in the austenite grain, wherein 5-30 strengthening phase grains are distributed in per square micro. The invention obviously improves the high-temperature duration intensity and ensures good high temperature corrosion resistance.

Description

technical field [0001] The invention relates to a heat treatment method for HR3C austenitic heat-resistant steel to obtain nano-reinforced phases, in particular to a heat treatment method for austenitic heat-resistant steel used in ultra-supercritical thermal power units, and belongs to the technical field of heat treatment. Background technique [0002] Improve power generation efficiency and reduce CO 2 and other harmful gas emissions, saving resources is the future development direction of thermal power units. Improving steam parameters and developing large-capacity units are the main means to improve thermal efficiency. At present, the parameters of thermal power units in various countries in the world have developed from subcritical parameters to supercritical parameters, and even ultra-supercritical (USC) parameters. The key technology for the development of USC units is to develop materials with high thermal strength, resistance to high temperature flue gas oxidatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00
Inventor 殷凤仕田丽倩薛冰姜学波周丽
Owner SHANDONG UNIV OF TECH
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