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为了探索GCr15轴承钢中魏氏组织和针状铁素体的形成机制，对GCr15轴承钢铸坯和线材以一设定的速率30℃/min从900℃冷却至600℃,随后空冷至室温。采用金相显微镜、扫描电子显微镜对从900℃冷却至600℃的过程中铸坯和线材的组织转变进行了原位检测。结果表明：铸坯的奥氏体晶粒平均尺寸为237μm,线材为145μm;在以30℃/min的速率从900℃冷却至600℃的过程中，由于其奥氏体晶粒平均尺寸不同，铸坯中形成了魏氏组织，而线材中未形成魏氏组织；铸坯和线材中均发生了晶内针状铁素体在尺寸小于6μm的Al2O3上形核和长大。
Abstract：In order to explore the mechanism whereby Widmannstaetten structure and acicular ferrite form in GCr15 bearing steel, the casting billet and the wire of GCr15 bearing steel were cooled at a set rate of 30 ℃/min from 900 to 600 ℃ then air cooled to room temperature. The structural transformation in the casting billet and the wire during cooling from 900 to 600 ℃was in-situ detected by metallographic microscope and scanning electron microscope. The results showed that(a) the average size of austenite grains was 237 μm in the casting billet and 145 μm in the wire;(b) in the process of cooling at a rate of 30 ℃/min from 900 to 600 ℃, the Widmannstaetten structure formed in the casting billet but did not form in the wire due to their difference in the average size of austenite grains; and(c) the nucleation and growth of intragranular acicular ferrite on Al2O3 measuring less than 6 μm occurred in both the casting billet and the wire.
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基本信息:
DOI：10.19947/j.issn.1001-7208.2024.04.05
中图分类号:TG142.1
引用信息:
[1]任珺,李慧改.GCr15轴承钢从奥氏体化温度冷却过程中的组织转变[J].上海金属,2025,47(04):13-19.DOI:10.19947/j.issn.1001-7208.2024.04.05.
基金信息:
国家自然科学基金(50734008)