Scholarlink

<p>To develop a melting-based larger-scale fabrication process for oxide dispersion strengthened (ODS) steel, this study proposed a method of zone melting with built-in precursor powder (ZMPP), followed by hot forging and aging treatments. A 50&#xa0;kg ingot was successfully prepared, highlighting the scalability of this innovative process. Microstructural analysis revealed a predominantly lath martensite matrix with a small amount of ferrite in the hot-forged ODS steel, without oxide particle aggregation. Aging at 750&#xa0;°C resulted in the formation of sub-micron-sized Cr<sub>23</sub>C<sub>6</sub> particles at grain boundaries and martensitic lath interfaces, accompanied by a high-density (7.64 × 10<sup>23</sup> m<sup>−3</sup>) nano-scale (~ 6 nm) Y–Si–O complex oxides after 25&#xa0;h. Additionally, the hot-forged sample exhibited a high yield strength (871&#xa0;MPa) but limited ductility (5.0%). Aging treatments led to an increase in ductility but a decrease in yield strength. Notably, prolonged aging maintained the strength level of steels while enhancing ductility, with a 23.3% total elongation observed after 25&#xa0;h. The novel ZMPP method, preparing high-quality ODS steels with uniform microstructure and good mechanical properties, provided a new avenue for large-scale production of ODS steels.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

An Innovative Large-Scale Preparation Method for ODS Steel: Zone Melting with Built-In Precursor Powder

  • 期刊论文

  • 发表日期：

    2025年5月13日

查看全文
  • Haoyu Cheng,
  • Chenyang Hou,
  • Jianlei Zhang,
  • Xiaodong Mao,
  • Yuanxiang Zhang,
  • Yanyun Zhao,
  • Chulun Shen,
  • Changjiang Song

摘要

To develop a melting-based larger-scale fabrication process for oxide dispersion strengthened (ODS) steel, this study proposed a method of zone melting with built-in precursor powder (ZMPP), followed by hot forging and aging treatments. A 50 kg ingot was successfully prepared, highlighting the scalability of this innovative process. Microstructural analysis revealed a predominantly lath martensite matrix with a small amount of ferrite in the hot-forged ODS steel, without oxide particle aggregation. Aging at 750 °C resulted in the formation of sub-micron-sized Cr23C6 particles at grain boundaries and martensitic lath interfaces, accompanied by a high-density (7.64 × 1023 m−3) nano-scale (~ 6 nm) Y–Si–O complex oxides after 25 h. Additionally, the hot-forged sample exhibited a high yield strength (871 MPa) but limited ductility (5.0%). Aging treatments led to an increase in ductility but a decrease in yield strength. Notably, prolonged aging maintained the strength level of steels while enhancing ductility, with a 23.3% total elongation observed after 25 h. The novel ZMPP method, preparing high-quality ODS steels with uniform microstructure and good mechanical properties, provided a new avenue for large-scale production of ODS steels.