Heat treatment method for enhancing impact energy of ultrahigh-strength steel

Abstract

The invention discloses a heat treatment method for enhancing impact energy of in-situ nano-particle reinforced ultrahigh-strength steel, and belongs to the field of metal materials. The heat treatment method comprises the following steps that 1, a hot-rolled steel plate is placed in a heat treatment furnace for heat preservation at the furnace temperature of 800-900 DEG C for 10-40 minutes, the steel plate is taken out, and the steel plate is water-cooled to room temperature; 2, the steel plate is placed in a heat treatment furnace for heat preservation, the furnace temperature ranges from 350 DEG C to 600 DEG C, heat preservation is conducted for 1-3 hours, and the steel plate is taken out and subjected to oil cooling to the room temperature. and 3, the steel plate is placed in the heat treatment furnace for heat preservation, the furnace temperature is 200-300 DEG C, heat preservation is conducted for 1-3 hours, and the steel plate is taken out and air-cooled to the room temperature. The novel heat treatment method is invented on the basis of not changing alloy components and a smelting process for the in-situ nano-particle reinforced ultra-high-strength steel, and compared with a traditional quenching and tempering heat treatment method, the impact energy of the in-situ nano-particle reinforced ultra-high-strength steel is improved.

Description

Technical field: [0001] The invention relates to a heat treatment method for improving the impact energy of ultra-high-strength steel reinforced by in-situ nanoparticles for ocean engineering. Specifically, it is a method of subjecting the hot-rolled in-situ nanoparticle-reinforced ultra-high-strength steel to three-stage heat treatment to further increase its impact energy. Background technique [0002] In recent years, with the continuous strengthening of the development of marine resources at home and abroad, higher and higher requirements have been put forward for the strength and low-temperature impact properties of steel used in marine engineering. The traditional way of preparing steel for marine engineering mainly adopts high-carbon high-alloy + quenching and tempering treatment. This technical route can basically meet the requirements of steel for marine engineering, but there are also problems such as poor weldability. At the same time, the pre-heat and post-heat ...

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Problems solved by technology

However, Cu nano-reinforced steel has problems such as poor thermal stability. Luo Xiaobing et al. )] Through the research, it is found that with the increase of aging temperature, the precipitation of Cu grows significantly compared with the under-aging state, and its shape changes from spherical to short rod or rod, which loses the coherent relationship with the matrix and deteriorates the performance of the steel plate.

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