Scholarlink

<p>In this study, Fe-based nanocrystalline alloy strips underwent cryogenic treatment, alongside Vickers microhardness, tensile, and large-load scratch tests conducted in a cryogenic environment to comprehensively examine the microscopic impact of low temperatures on their properties. The results indicated that cryogenic treatment did not alter the structure or soft magnetic properties of the strips. Maximum tensile strength improvements of 3.5 and 13.1% were observed at 233 and 193&#xa0;K, respectively. Furthermore, a significant ductile-to-brittle transition (DBT) was observed. Microhardness measurements revealed a linear relationship with temperature, showing a 36.9% increase at 133&#xa0;K. Additionally, cryogenic shear tests assessed the influence of varying temperatures on HSS cutter wear and the shear quality of the strips. The findings showed enhanced strip strength in cryogenic environment, accompanied by increased brittleness and fracture-dominated deformation. The bottom flip-over burr of the section was eliminated, and the surface shear band width decreased by 40% after 1000 shears. Brittle fracture during cryogenic shearing reduced peak shear force by 14.7%, while liquid nitrogen gas flow and air condensate lubrication mitigated tool edge wear. Cryogenic conditions inhibited the movement and migration of free bodies within the strip, suppressing crack propagation and enhancing the cross-sectional quality.</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

Cryogenic Shear Characteristics of Fe-Based Nanocrystalline Alloy Strips

  • 期刊论文

  • 发表日期：

    2025年5月7日

查看全文
  • Siwei Chen,
  • Qiusheng Yan,
  • Sun Peng

摘要

In this study, Fe-based nanocrystalline alloy strips underwent cryogenic treatment, alongside Vickers microhardness, tensile, and large-load scratch tests conducted in a cryogenic environment to comprehensively examine the microscopic impact of low temperatures on their properties. The results indicated that cryogenic treatment did not alter the structure or soft magnetic properties of the strips. Maximum tensile strength improvements of 3.5 and 13.1% were observed at 233 and 193 K, respectively. Furthermore, a significant ductile-to-brittle transition (DBT) was observed. Microhardness measurements revealed a linear relationship with temperature, showing a 36.9% increase at 133 K. Additionally, cryogenic shear tests assessed the influence of varying temperatures on HSS cutter wear and the shear quality of the strips. The findings showed enhanced strip strength in cryogenic environment, accompanied by increased brittleness and fracture-dominated deformation. The bottom flip-over burr of the section was eliminated, and the surface shear band width decreased by 40% after 1000 shears. Brittle fracture during cryogenic shearing reduced peak shear force by 14.7%, while liquid nitrogen gas flow and air condensate lubrication mitigated tool edge wear. Cryogenic conditions inhibited the movement and migration of free bodies within the strip, suppressing crack propagation and enhancing the cross-sectional quality.