Variable-temperature circular treatment method of ultrafine C250 maraging steel grains

Abstract

The invention discloses a variable-temperature circular treatment method of ultrafine C250 maraging steel grains, which comprises the following steps: heating C250 maraging steel to 700-780 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing primary circular treatment; and heating the material subjected to primary circular treatment to 900-960 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing secondary circular treatment. The variable-temperature circular treatment twice simultaneously implements refinement and homogenization of the C250 maraging steel grains. By utilizing the characteristic of phase-change cold hardening recrystallization in the reverse change process from martensitic structure to austenite by heating, the variable-temperature circular treatment twice effectively and sufficiently refines and homogenizes the austenite grains without plastic deformation. The invention can effectively enhance the toughness and fatigue life of the part.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a variable temperature cycle treatment method for superfine C250 maraging steel grains. Background technique [0002] With the rapid development of my country's machinery industry, especially the aviation and aerospace industries, there are higher requirements for high-strength materials. Due to its excellent combination of strength and toughness, C250 maraging steel has received great attention from material workers in various countries, and has broad development prospects. Its further development, development and application are imperative. Among them, grain refinement strengthening is the main means to improve the strength, plasticity and toughness of maraging steel. The traditional means of grain refinement mainly include solid solution treatment and deformation treatment to refine grains, etc. The deformation treatment process is easy to produce texture, which ...

AI Technical Summary

Problems solved by technology

The traditional means of grain refinement mainly include solid solution treatment and deformation treatment to refine grains, etc. The deformation treatment process is easy to produce texture, which makes its performance directional and affects the application of materials in high-tech products; However, the effect of simple solution treatment on grain refinement is limited, and it is difficult to meet the requirements of modern equipment.

Therefore, the effect of the existing C250 maraging steel grain refinement treatment method is still not ideal

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