Technological process for improving twin boundary amount in gamma' precipitation strengthened type ferrous alloy
An iron-based alloy, precipitation strengthening technology, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of long cycle, complex process, unfavorable production, etc., and achieve the effect of low production cost and simple preparation method.
Inactive Publication Date: 2010-02-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
[0004] The purpose of the present invention is to provide a kind of process method that improves the number of twin grain boundaries in the γ ' precipitation strengthening type iron-based alloy, solves the cycle that obtains more twin grain boundaries required in the prior art is long, and process is complicated, and treatment temperature and Time requires high control precision, which is not conducive to production and other issues
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[0030] Taking two different FeNiCr alloys as examples, the main components of the alloys are shown in Table 1. The original state of the 1# alloy is a forged plate with a thickness of 28mm, and the original state of the 2# alloy is a bar with a diameter of 31mm. Rolling and high temperature rolling + medium temperature rolling are treated to compare the number of twin boundaries.
[0031] Table 1 Example alloy main components
[0032] Alloy
C
Ni
Cr
Mo
Al
Ti
1#
≤0.02
30
15
1.5
0.3
2.0
2#
≤0.02
31
15
4.5
1.5
3.0
[0033] The process parameters of high temperature rolling are as follows:
[0034] 1) Use a continuous gas furnace or electric furnace to heat, set the furnace temperature to 1150°C±10°C, and when the furnace temperature reaches 800°±10°C, put the precipitation-strengthened iron-based alloy into the furnace and he...
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Abstract
The invention relates to a technique method for improving the twin crystal boundary amount of Gamma' precipitation strengthening type ferrous alloys, in particular to a method for obviously improvingthe twin crystal amount of the Gamma' precipitation strengthening type ferrous alloys after normal heat treatment through adding an intermediate temperate rolling and deformation after the high temperature heat processing of the alloy. The technique method solves the problems that the prior art needs a long cycle to obtain more twin crystal boundaries, a high control precision required by treatment temperature and time and goes against the production, and the like. With regard to the Gamma' precipitation strengthening type ferrous alloys, after high temperature heat processing (forging or rolling) is carried out normally, the intermediate temperate rolling is added to carry out 8 percent to 12 percent rolling and deformation at the temperature of 600 DEG C to 750 DEG C over materials, andtherefore, the twin crystal amount of the obtained materials after normal solution heat treatment is far higher than that of the alloy going through the same heat treatment after normal high temperature rolling.
Description
Technical field: [0001] The invention relates to a process method for increasing the number of twin grain boundaries in a γ′ precipitation-strengthened iron-based alloy. Specifically, after the alloy is hot-processed at high temperature, a medium-temperature rolling deformation is added to make the γ′-precipitated-strengthened iron-based alloy The method in which the number of twins in the alloy increases significantly after normal heat treatment. Background technique: [0002] A lot of research work shows that the grain boundary is the weak link for corrosion and fatigue fracture of the alloy. Therefore, in the 1980s, the concept of "Grain Boundary Engineering (GBE)" was proposed, aiming at thermal processing or (and) heat treatment , to increase the content of heavy site lattice grain boundaries in the alloy to improve the performance of the alloy. At present, research results have shown that the corrosion resistance or plasticity of Inconel 600, Inconel 690, 304 stainles...
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IPC IPC(8): C21D8/00B21B37/16B21B37/74B21J1/06
Inventor 李秀艳戎利建李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI