Effect of Alloying Elements Diffusion on Heterogeneous Nucleation of κ-Carbide in 1.25C-1.5Cr-5Al Bearing Steel

庞佳琛; 王国栋; 易红亮

doi:10.20057/j.1003-8620.2022-00129

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Effect of Alloying Elements Diffusion on Heterogeneous Nucleation of κ-Carbide in 1.25C-1.5Cr-5Al Bearing Steel

更新时间：2026-01-21

- Effect of Alloying Elements Diffusion on Heterogeneous Nucleation of κ-Carbide in 1.25C-1.5Cr-5Al Bearing Steel
- Special Steel Vol. 43, Issue 6, Pages: 21-27(2022)
- 作者机构：
  
  东北大学轧制技术及连轧自动化国家重点实验室,沈阳,110189
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00129
  CLC：
- Received：07 September 2022，
  
  Online First：17 November 2022，
  
  Published：17 November 2022
- 稿件说明：
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庞佳琛, 王国栋, 易红亮. Effect of Alloying Elements Diffusion on Heterogeneous Nucleation of κ-Carbide in 1.25C-1.5Cr-5Al Bearing Steel[J]. Special Steel, 2022, 43(6): 21-27.
DOI：

庞佳琛, 王国栋, 易红亮. Effect of Alloying Elements Diffusion on Heterogeneous Nucleation of κ-Carbide in 1.25C-1.5Cr-5Al Bearing Steel[J]. Special Steel, 2022, 43(6): 21-27. DOI： 10.20057/j.1003-8620.2022-00129.

摘要

采用组织观察、成分检测、热力学计算及结构分析等方法研究了1.25C-1.5Cr-5Al轴承钢离异共析相变过程中Al对κ碳化物不均匀形核的影响，并验证了混合碳化物组成的粒状珠光体对该钢最终硬化热处理组织及性能的影响。结果表明：退火温度由850℃降低至800℃过程中部分未溶解渗碳体溶解入奥氏体基体，未溶解渗碳体含量(体积分数)由(3.1±0.5)vol.%降低至(2.8±0.6)vol.%。高退火温度下的高扩散速度使Al能够在奥氏体中均匀分布，θ/γ界面附近不存在Al偏聚。铁素体中的高Al含量为κ碳化物形核提供成分需求。铁素体中高浓度Al有助于κ碳化物在渗碳体表面成核。

Abstract

Through microstructure observation

chemical composition detection

thermodynamic calculation and structure analysis

the effect of Al on the heterogeneous nucleation of K-carbide during the divorced-eutectoid transformation process of 1.25C-1.5Cr-5Al bearing steel is studied

and the influence of spheroidal pearlite consisting of a mixture of carbides on the final quenched treatment^ microstructure and hardness of steel is investigated. The results shows that when the annealing temperature decreases from 850 ℃ to 800 °C

a small amount of undissolved cementite dissolves into austenite

and the non-dissolved cementite content (volume fraction) decreases from (3. 1 ±0.5) vol. % to (2.8 ±0. 6) vol. %. There is no segregation of Al in austenite along the θ/γ interface due to its high diffusion rate at high annealing temperature. The κ-carbide nucleation at the cementite interface is facilitated by ferrite' s high Al concentration.

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