一种高碳中高合金钢及其制备方法

本发明关于一种高碳中高合金钢及其制备方法，其中，所述制备方法包括如下步骤：步骤1)采用真空感应熔炼工艺、真空自耗熔炼工艺制备出自耗锭；在自耗锭中：液析碳化物的最大等效直径小于100μm、全氧含量小于10ppm、夹杂物尺寸≤10μm、N含量小于40ppm；步骤2)以自耗锭作为坯料，先进行保温处理，再进行至少一次高温扩散及热变形处理，得到高碳中高合金钢；其中，每一次高温扩散及热变形处理的步骤包括：以设定升温速率将坯料的温度升温至高温扩散处理温度，进行高温扩散处理；再以设定降温速率将坯料的温度降温至热变形处理温度，进行热变形处理。本发明提供一种替代粉末冶金技术的低成本工艺，能有效减小甚至消除高碳中高合金钢中的粗大析出相。This invention relates to a high-carbon medium-high alloy steel and a preparation method thereof, wherein the preparation method comprises the following steps: Step 1: A consumable electrode ingot is prepared via vacuum induction melting and vacuum consumable arc melting processes. For this ingot, the maximum equivalent diameter of liquid-precipitated carbides is less than 100 μm, the total oxygen content is below 10 ppm, the size of inclusions is ≤10 μm, and the nitrogen content is less than 40 ppm. Step 2: Take the consumable electrode ingot as a billet, first conduct heat preservation treatment, then perform at least one cycle of high-temperature diffusion and hot deformation treatment to obtain the target high-carbon medium-high alloy steel. Each cycle of high-temperature diffusion and hot deformation treatment consists of: heating the billet to the high-temperature diffusion treatment temperature at a specified heating rate and carrying out the diffusion treatment; then cooling the billet to the hot deformation treatment temperature at a specified cooling rate and performing the hot deformation treatment. This invention provides a low-cost alternative to powder metallurgy technology, which can effectively reduce or even eliminate coarse precipitated phases in high-carbon medium-high alloy steels.

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背景与挑战

背景概述

该数据集描述了一种高碳中高合金钢的制备方法，包括真空熔炼控制自耗锭成分和后续高温扩散与热变形处理。其关键特点在于提供了一种低成本替代粉末冶金技术的工艺，能显著减小或消除钢材中的粗大析出相，从而提高材料性能。