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Heat treatment method of additive manufacturing high-temperature alloy working in low-temperature environment

A heat treatment method and additive manufacturing technology, applied in the direction of additive processing, etc., to achieve excellent low-temperature performance, improve uneven structure, and eliminate residual internal stress

Active Publication Date: 2020-04-07
XIAN SPACE ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat treatment process system provided by the current laser selective melting forming superalloy standard or academic literature is mostly based on the existing forging and casting heat treatment process system

Method used

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  • Heat treatment method of additive manufacturing high-temperature alloy working in low-temperature environment
  • Heat treatment method of additive manufacturing high-temperature alloy working in low-temperature environment
  • Heat treatment method of additive manufacturing high-temperature alloy working in low-temperature environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take a certain type of engine turbo pump centrifugal wheel as an example.

[0023] (1) The workpiece is manufactured by laser selective melting and forming additive manufacturing superalloy.

[0024] (2) Heat treatment: The centrifugal wheel after separating the substrate is heat treated in a vacuum heat treatment furnace, and the pressure in the furnace is not greater than 10 -3 Pa, after the environment in the furnace meets the requirements, heat up to 1100°C for 4 hours. After the heat preservation is completed, backfill with argon to cool, and the pressure of backfill with argon is 3.03×10 5 Pa, cooled to below 80°C and air-cooled; then heat treated in a vacuum heat treatment furnace, the pressure in the furnace is not greater than 10 -3 Pa, after the environment in the furnace meets the requirements, heat it up to 730°C for 8 hours, then cool it to 630°C at a cooling rate of 50°C / h and keep it for 8 hours. After the heat preservation is over, backfill with argon t...

Embodiment 2

[0029] Take the high-pressure housing of a certain type of engine turbo pump oxygen pump as an example.

[0030] (1) The workpiece is manufactured by laser selective melting and forming additive manufacturing superalloy.

[0031] (2) Heat treatment: The centrifugal wheel after separating the substrate is heat treated in a vacuum heat treatment furnace, and the pressure in the furnace is not greater than 10 -3 Pa, after the environment in the furnace meets the requirements, heat up to 1080°C for 4 hours. After the heat preservation is completed, backfill with argon to cool, and the pressure of backfill with argon is 2.02×10 5 Pa, cooled to below 80°C and air-cooled; then heat treated in a vacuum heat treatment furnace, the pressure in the furnace is not greater than 10 -3 Pa, after the environment in the furnace meets the requirements, heat it up to 730°C for 8 hours, then cool it to 630°C at a cooling rate of 50°C / h and keep it for 8 hours. After the heat preservation is over...

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Abstract

The invention discloses a heat treatment method of an additive manufacturing high-temperature alloy working in a low-temperature environment. A heat treatment technology comprises the steps of carrying out heat preservation on the additive manufacturing high-temperature alloy for 1 h to 4 h under a condition of a vacuum environment where a pressure intensity is not greater than 10 <-3 > Pa and under the condition that a temperature is 1080 DEG C to 1150 DEG C, recharging argon and cooling; and then carrying out heat preservation for 8 h + / -0.5 h under the condition of the vacuum environment where the pressure intensity is not greater than 10 <-3> Pa and under the condition that the temperature is 730 DEG C + / -10 DEG C, then carrying out furnace cooling at a cooling speed of 50 DEG C / h tillthat the temperature is 630 DEG C + / -10 DEG C, carrying out heat preservation for 8 h+ / -0.5 h, recharging argon and cooling. After heat treatment, a reinforced precipitated phase of a material is well matched with an austenitic matrix, good low temperature performance is obtained, and working requirements in the low temperature environment can be satisfied, wherein the working requirements include that at-196 DEG C, Rm is not less than 1500 N / mm <2>, Rp0.2 is not less than 1200 N / mm <2>, A is not less than 10%, Z is not less than 20%, and KU2 is not less than 45 J.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, in particular to a heat treatment method for additively manufacturing superalloys working in a low-temperature environment. Background technique [0002] The nickel-based superalloy involved in the present invention is a Ni-Cr-Fe-based precipitation-hardening superalloy with a long-term service temperature range of -253°C to 650°C and excellent comprehensive mechanical properties. In order to improve the reliability of working parts in low temperature (such as liquid oxygen or liquid hydrogen) environment, the nickel-based superalloy with better stability is selected. [0003] Additive manufacturing technology, especially laser selective melting forming technology, is currently widely used in the manufacture of superalloy parts with complex spatial structures that are difficult to form by traditional techniques or have complex processing procedures. However, the heat treatme...

Claims

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Application Information

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IPC IPC(8): C22F1/02C22F1/18B33Y40/20
CPCB33Y40/00C22F1/02C22F1/18
Inventor 李护林杨欢庆雷钥王琳王云
Owner XIAN SPACE ENGINE CO LTD
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