Critical solid solution and multi-time variable-temperature alternating aging composite heat treatment method starting from low temperature

Abstract

The invention provides a critical solid solution and multi-time variable-temperature alternating aging composite heat treatment method starting from low temperature. The method comprises a critical solid solution heat treatment process and a critical-starting low-temperature multi-time variable-temperature alternating aging composite heat treatment process. According to the scheme, the problems that existing austenitic stainless steel heat treatment is poor in quality stability, low in qualified rate, low in hardness, low in mechanical property, poor in consistency, poor in discoloration and corrosion resistance, long in heating time, low in efficiency, low in cost and the like can be solved. The heating reliability of heat treatment equipment is poor; the service life of a high-temperature component is short; the cost is high; and the like.

Description

technical field [0001] The invention relates to the technical field of heat treatment of materials, in particular to a composite heat treatment method of critical solid solution and critical starting at low temperature with multiple temperature changes and alternating aging. Background technique [0002] The heat treatment principles of austenitic stainless steel and alloy structural steel are completely different: alloy structural steel can undergo high-temperature austenite transformation under high temperature conditions (good heat treatment process), therefore, alloy structural steel is very easy to pass through quenching and tempering heat treatment methods The hardness (or mechanical properties) is greatly improved; while austenitic stainless steel cannot undergo high-temperature austenite transformation under high temperature conditions (only limited dissolution and precipitation of alloy element strengthening phases, poor heat treatment processability), therefore, aus...

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Problems solved by technology

It can solve the existing traditional mainstream austenitic stainless steel solid solution and aging heat treatment problems such as poor quality stability, low qualified product rate, low hardness, low mechanical properties and poor consistency, poor resistance to discoloration and corrosion, long heating time, low efficiency, and heat treatment problems. Poor heating reliability of equipment, low service life and high cost of high-temperature components, etc.

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