A kind of high thermal stability in-situ nano-phase reinforced high-strength and tough steel and preparation method thereof
A high thermal stability, nano-phase technology, applied in the field of alloy steel, can solve the problems of weakening the precipitation strengthening effect of Cu nanoparticles, the influence of plastic toughness, and damage to the mechanical properties of materials, and achieves the reduction of C content, high thermal stability, and improved thermal stability. sexual effect
Active Publication Date: 2021-11-16
UNIV OF SCI & TECH BEIJING
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However, HSLA series steels also have some technical shortcomings, such as the Cu nano-precipitation phase produced during the aging process, the size of the initial precipitation is small and nearly spherical, and it maintains a coherent relationship with the matrix, but when it exceeds a certain heat treatment temperature (>550°C) will begin to coarsen and grow, and become irregular shapes (strips, rods, etc.), at the same time, the coherent relationship with the matrix gradually changes to non-coherent, and the result of this coarsening is seriously weakened. The precipitation strengthening effect of Cu nanoparticles is greatly affected, and the plasticity and toughness of steel are greatly affected, which seriously damages the overall mechanical properties of the material.
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[0032] In order to better understand the technical solutions of the present invention, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.
[0035] The present invention provides a high-str...
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Abstract
The present invention provides an in-situ nano-phase strengthened high-strength and tough steel with high thermal stability and a preparation method thereof. The microstructure of the high-strength and tough steel is tempered martensite and nano-sized oxides dispersed in the matrix ‑Carbide composite in-situ nanophase, after vacuum smelting, titanium is added by feeding wire, and an ingot with the target composition design range is obtained by electroslag remelting, and the ingot contains a large amount of high-melting point titanium oxide in-situ nanophase , through hot rolling and quenching and tempering heat treatment, an oxide-carbide composite in-situ nano-phase reinforced high-strength and tough steel with high thermal stability was obtained. The invention can relax the process window of quenching and tempering heat treatment, and obtain in-situ nano-phase strengthened high-strength and tough steel with high thermal stability.
Description
【Technical field】 [0001] The invention relates to the technical field of alloy steel, in particular to a high-strength and tough steel with high thermal stability and in-situ nano phase strengthening and a preparation method thereof. 【Background technique】 [0002] With the exploitation of marine resources and the development of marine national defense, high-strength steel plates for marine use must have the characteristics of high strength, high toughness, easy welding, fatigue resistance, and corrosion resistance. The HSLA series of steel overcomes the problems of low impact energy and difficult welding of HY series steel, and greatly reduces carbon and alloy to improve the weldability of the steel. However, the resulting decrease in strength is solved by using nano Cu particles for reinforcement. However, HSLA series steels also have some technical shortcomings, such as the Cu nano-precipitation phase produced during the aging process, the size of the initial precipitati...
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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21C7/00C21C7/10C21D6/00C22B9/18C22C33/04C21D8/02
CPCC21C7/0006C21C7/0056C21C7/10C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0263C22B9/18C22C33/04C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 庞晓露石荣建王自东乔利杰陈晓华杨明
Owner UNIV OF SCI & TECH BEIJING