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Technology for accelerating solid solution speed of indissolvable delta ferrite in martensite heat-resistant steel ingot and refining austenite grains

A technology of austenite grains and delta ferrite, which is applied in martensitic heat-resistant steel ingots. The solid solution rate of delta ferrite can refine austenite grains at the same time, which can solve the problem of austenite grains. Coarse and other problems, to achieve the effect of simple steps, promote equilibrium diffusion rate, and increase solid solution rate

Inactive Publication Date: 2017-10-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention aims at the problem of insoluble delta ferrite and coarse austenite grains in the structure of martensitic heat-resistant steel ingots after high temperature and long-term solid solution. Deformation in the austenite temperature range to increase the solid solution rate of this insoluble delta ferrite and refine the austenite grains

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present invention improves the solid solution rate of refractory delta ferrite existing in the structure after high temperature and long-term solid solution in the martensitic heat-resistant steel ingot and refines the austenite grains at the same time. The specific steps are as follows:

[0025] (1) The chemical composition is: (C: 0.10%, Si: 0.22%, Mn: 0.78%, Cr: 12.0%, Ni: 2.50%, Mo: 1.65%, V: 0.32%, N: 0.033%), The 10Cr12Ni3Mo2VN ingot after solid solution at 1180°C for 8 hours was cooled to room temperature to obtain a martensitic heat-resistant steel ingot with insoluble δ ferrite in the structure;

[0026] (2) Heating the cast ingot obtained in step (1) to 1000° C. and holding the temperature for 1 hour to complete austenitization;

[0027] (3) Then the ingot is compressed and deformed by 60% at 1000 °C to increase the internal lattice defects in the δ ferrite, and promote the balanced diffusion of alloying elements by increasing the internal lattice defects,...

Embodiment 2

[0029] The present invention improves the solid solution rate of refractory delta ferrite existing in the structure after high temperature and long-term solid solution in the martensitic heat-resistant steel ingot and refines the austenite grains at the same time. The specific steps are as follows:

[0030] (1) The chemical composition is: (C: 0.10%, Si: 0.22%, Mn: 0.78%, Cr: 12.0%, Ni: 2.50%, Mo: 1.65%, V: 0.32%, N: 0.033%), 10Cr12Ni3Mo2VN ingots after solid solution at 1200°C for 8 hours were cooled to room temperature to obtain martensitic heat-resistant steel ingots with refractory δ ferrite in the structure;

[0031] (2) Heating the ingot obtained in step (1) to 1000° C., holding the temperature for 2 hours to complete austenitization;

[0032] (3) Then the ingot is compressed and deformed by 80% at 1000°C to increase the internal lattice defects in the delta ferrite, and promote the balanced diffusion of alloying elements by increasing the internal lattice defects, there...

Embodiment 3

[0034] The present invention improves the solid solution rate of refractory delta ferrite existing in the structure after high temperature and long-term solid solution in the martensitic heat-resistant steel ingot and refines the austenite grains at the same time. The specific steps are as follows:

[0035] (1) The chemical composition is: (C: 0.10%, Si: 0.22%, Mn: 0.78%, Cr: 12.0%, Ni: 2.50%, Mo: 1.65%, V: 0.32%, N: 0.033%), The 10Cr12Ni3Mo2VN ingot after solid solution at 1180°C for 8 hours was cooled to room temperature to obtain a martensitic heat-resistant steel ingot with insoluble δ ferrite in the structure;

[0036](2) Heating the ingot obtained in step (1) to 1050° C., holding the temperature for 2 hours to complete austenitization;

[0037] (3) Then the ingot is compressed and deformed by 60% at 1050°C to increase the internal lattice defects in the delta ferrite, and promote the balanced diffusion of alloying elements by increasing the internal lattice defects, ther...

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Abstract

The invention provides a technology for accelerating a solid solution speed of indissolvable delta ferrite in a martensite heat-resistant steel ingot in a structure after high-temperature long-time solid solution and refining austenite grains; and the technology for generating a lot of lattice defects in delta ferrite by using lower-temperature (below steel austenite grain roughening temperature) austenitizing and deformation accelerates the solid solution speed of the delta ferrite in the martensite heat-resistant steel ingot after high-temperature long-time solid solution, and meanwhile, obtains fine austenite grains. The martensite heat-resistant steel ingot is cooled to reach the room temperature after high-temperature solid solution of 1180-1200 DEG C by 8-10 h, and then, are heated for austenitizing of 1000-1050 DEG C; and the compression deformation of above 60% is performed, so that the solid solution speed of the delta ferrite is accelerated, and meanwhile, the fine austenite grains are obtained. The technology has the following advantages: the solid solution speed of the indissolvable delta ferrite in the martensite heat-resistant steel ingot in the structure after high-temperature long-time solid solution can be greatly accelerated; meanwhile, the austenite grains are refined; and the steps are simple.

Description

technical field [0001] The invention belongs to the field of research on non-equilibrium phases in metal structures, in particular to a method for improving the solid solution rate of δ ferrite in martensitic heat-resistant steel ingots in which refractory δ ferrite exists in the structure after high temperature and long-term solid solution A technique for refining austenite grains. Background technique [0002] δ ferrite is a non-equilibrium phase in martensitic heat-resistant steel. δ ferrite in forgings is extremely harmful to the isotropy of mechanical properties, low temperature toughness and welding performance, so it must be completely eliminated. Martensitic heat-resistant steel ingots generally contain more δ ferrite, which can only be eliminated by solid solution, and δ ferrite in martensitic heat-resistant steel ingots The solid solution rate is higher at the beginning of the solution, and the elimination is faster. With the prolongation of the solution time, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C22C38/44C22C38/46C22C38/04C22C38/02C22C38/52C22C38/48C22C38/54
CPCC21D8/005C21D2211/001C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/52C22C38/54
Inventor 李俊儒王力伟程联军白硕玮
Owner QINGDAO UNIV
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