Heat treatment technology for strengthening crystal boundary of cold rolling state ferronickel-based high temperature alloy

A high-temperature alloy, nickel-iron-based technology, applied in the field of high-temperature alloy materials for power stations, can solve the problems of intergranular fracture of alloys, affecting the high-temperature durability of alloy materials, etc., to achieve high-temperature durability, increase microhardness, and large grain size Effect

Active Publication Date: 2014-11-19
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high temperature, the grain boundary is the weak link of the alloy structure. If the grain boundary strength is low, the alloy is prone to intergranular fracture under long-term persistent stress, which seriously affects the high-temperature durable strength of the alloy material.

Method used

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  • Heat treatment technology for strengthening crystal boundary of cold rolling state ferronickel-based high temperature alloy
  • Heat treatment technology for strengthening crystal boundary of cold rolling state ferronickel-based high temperature alloy
  • Heat treatment technology for strengthening crystal boundary of cold rolling state ferronickel-based high temperature alloy

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Embodiment 1

[0025] see figure 1 , take a nickel-iron-based superalloy within the composition range in the summary of the invention, the melting point of the alloy is 1400°C (1673K), the solid solution temperature of the γ' phase is 934°C, M 23 C 6 The solid solution temperature of type carbide is 855°C. The nickel-iron-based superalloy plate is rolled from 20mm to 10mm at room temperature, and then the first step of solution treatment is carried out. The alloy sample is kept at 1150°C for 1 hour and then air-cooled to room temperature; the second step is high temperature For aging treatment, the alloy sample was kept at 820°C for 1 hour and then air-cooled to room temperature; the third step was low-temperature aging treatment, and the alloy sample was kept at 780°C for 16 hours and then air-cooled to room temperature. The grain size of the alloy structure after heat treatment is 113 microns, the average size of the γ' phase is 55 nanometers, and the grain boundaries are continuous and ...

Embodiment 2

[0027] see figure 1 , take a nickel-iron-based superalloy within the composition range in the summary of the invention, the melting point of the alloy is 1392°C (1665K), the solid solution temperature of the γ' phase is 956°C, M 23 C 6 The solid solution temperature of carbide is 839°C. The nickel-iron-based superalloy plate is rolled from 20mm to 10mm at room temperature, and then the first step of solution treatment is carried out. The alloy sample is kept at 1150°C for 0.75 hours and then air-cooled to room temperature; the second step is high temperature For aging treatment, the alloy sample was kept at 810°C for 1 hour and then air-cooled to room temperature; the third step was low-temperature aging treatment, and the alloy sample was kept at 770°C for 12 hours and then air-cooled to room temperature. The grain size of the alloy structure after heat treatment is 120 microns, the average size of the γ' phase is 60 nanometers, and the grain boundaries are continuous and e...

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Abstract

The invention discloses a heat treatment technology for strengthening a crystal boundary of a cold rolling state ferronickel-based high temperature alloy. The heat treatment technology comprises the following three steps: 1) solution heat treatment is performed for 0.75-1.5 hours at 0.84-0.87Tm (Tm is the thermodynamics melting temperature of alloy materials), and then ferronickel-based high temperature alloy samples are taken out of a furnace to be air cooled to a room temperature; 2) the ferronickel-based high temperature alloy samples are preserved at the temperature 30-60 DEG C lower than the solid solution temperature of M23C6 type carbides for 1-2 hours, and then the ferronickel-based high temperature alloy samples are taken out of the furnace to be air cooled to the room temperature; 3) the ferronickel-based high temperature alloy samples are preserved at the temperature 150-200 DEG C lower than a gamma-phase solid solution temperature for 8-20 hours, and then the ferronickel-based high temperature alloy samples are taken out of the furnace to be air cooled to the room temperature. For the ferronickel-based high temperature alloy which is obtained through the heat treatment technology disclosed by the invention, the M23C6 type carbides are continuously and evenly distributed in the crystal boundary, strengthening phases gamma are evenly distributed in crystals, the enduring quality of the alloys at the condition of high temperature is good, the microhardness is higher, and the ferronickel-based high temperature alloys have higher tensile strength.

Description

【Technical field】 [0001] The invention belongs to the field of superalloy materials for power stations, and specifically relates to a heat treatment process for grain boundary strengthening of a cold-rolled nickel-iron-based superalloy with a γ / γ′ dual-phase structure. 【Background technique】 [0002] With the development of electric power technology, the development of 700 ℃ ultra-supercritical coal-fired power generation technology has very important strategic significance and practical application value for saving energy, reducing pollutants and carbon dioxide emissions in my country. The steam parameters of the power station are increased from 600°C super (super)critical and subcritical to 700°C ultra-supercritical level (700°C / 35MPa), which requires the performance of the metal materials selected for key components to adapt to the harsher service environment inside the boiler. Traditional heat-resistant steel can no longer meet the requirements of use, while nickel-iron-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22F1/16C22C19/05C22C30/00
Inventor 尹宏飞谷月峰赵新宝党莹樱鲁金涛严靖博杨珍
Owner HUANENG POWER INT INC
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