Method for accelerating aging of T/P92 heat-resistant steel

A technology for accelerated aging and heat-resistant steel, applied in the field of heat treatment of steel materials, it can solve the problems of short service time and inability to obtain aging structure, evaluation, and inability to age.

Inactive Publication Date: 2018-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] The purpose of the invention of the present invention is to provide a heat treatment method for accelerated aging of T/P92 heat-resistant steel, so as to obtain different degrees of aging structures of T/P92 heat-resistant steel, and sol...

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  • Method for accelerating aging of T/P92 heat-resistant steel
  • Method for accelerating aging of T/P92 heat-resistant steel
  • Method for accelerating aging of T/P92 heat-resistant steel

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Embodiment 1

[0020] The materials used in the present invention are obtained from the actual cutting of the main steam pipe of P92 heat-resistant steel in a supercritical power plant of a certain power plant. After re-heat treatment, accelerated aging aging was carried out and compared with its original service state. Firstly, carry out the high-temperature rapid short-term accelerated aging experiment of the matrix and carbide, and choose AC 1 Aging is carried out at a temperature (800°C) of 30°C below the point (about 830°C) for 305 hours. After the aging is completed, aging at a lower temperature (650°C) is used to rapidly precipitate the Laves phase, and finally realize the aging structure equivalent to the actual working conditions in different periods.

[0021] like figure 1 As shown, the change in hardness of P92 aged at 790°C and 800°C after using the present invention, under these two schemes, the change law of hardness conforms to the law of tissue degradation, and the initial ...

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Abstract

The invention relates to the field of heat treatment of iron and steel materials, particularly to a heat treatment method for accelerating the aging of a T/P92 heat-resistant steel. The method comprises: carrying out rapid high-temperature short-term aging accelerating on a substrate and a carbide, and ageing at a temperature of 30-40 DEG C below the AC1 point; carrying out secondary ageing at a temperature of 650 DEG C after completing the aging to ensure the rapid precipitation of the Laves phase, such that the aging structure equivalent to the actual working condition at different stages isachieved. According to the present invention, with the aging accelerating method, different degrees of the aging structures of the T/P92 heat-resistant steel can be rapidly obtained, and the aging structure in the actual working condition of the T/P92 heat-resistant steel can be accurately, reliably and equivalently simulated, such that technical problem that different degrees of the aging structures during the whole use stage cannot be obtained due to the short service time of the T/P92 heat-resistant steel so as not to perform the effective aging grade evaluation in the prior art can be solved.

Description

technical field [0001] The invention relates to the field of heat treatment of iron and steel materials, in particular to a heat treatment method for accelerated aging of T / P92 heat-resistant steel. Background technique [0002] The precipitated phases in the new martensitic heat-resistant steel structure mainly include MX carbonitrides, M 23 C 6 Type carbide, and a large amount of Laves phase precipitated at high temperature for a long time (more than 500 hours), while the Z phase will not appear until tens of thousands of hours of long-term high-temperature service. Among the four important precipitated phases, MX-like carbonitrides and M 23 C 6 Type carbides have good thermal stability, among which MX type carbonitrides are the most stable, and still do not grow significantly after tens of thousands of hours of long-term high-temperature service. m 23 C 6 The thermal stability of the Z-type carbide is slightly worse, but its growth conforms to the Oswald ripening la...

Claims

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Application Information

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Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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