Scholarlink

<p>The present study investigates the microstructural evolution and mechanical behavior of an austenitic low-density Fe-27Mn-7Al-1.2&#xa0;C steel microalloyed with Ti/B after autogenous gas tungsten arc welding (GTAW). Microtensile specimens were extracted from the fusion zone (FZ) and two heat-affected zones (HAZ-1 and HAZ-2) and evaluated through optical and electron microscopy, electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and Vickers microhardness testing. The welded joint exhibited dendritic austenite in the FZ and equiaxed austenite with κ-carbide precipitation in the HAZs. The FZ showed the lowest mechanical performance (YS 395&#xa0;MPa, UTS 534&#xa0;MPa, elongation 45%), whereas HAZ-1 and HAZ-2 exhibited strengthening associated with κ-carbides and TiC/AlN precipitates (UTS up to 671&#xa0;MPa). Strain-hardening analysis using Hollomon and Ludwick models indicated a higher hardening capacity in the HAZs. The findings demonstrate how welding thermal cycles control precipitation, microstructural morphology, and mechanical response in LD steels, providing insight for improved weldability and performance of lightweight structural components.</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

Mechanical behavior of welded plates of austenitic low-density Fe-Mn-Al-C steels microalloyed with Ti/B by microtensile testing

  • 期刊论文

  • 发表日期：

    2026年1月12日

查看全文
  • Carlos Enrique Coronado-Alba,
  • Ignacio Mejía,
  • José María Cabrera

摘要

The present study investigates the microstructural evolution and mechanical behavior of an austenitic low-density Fe-27Mn-7Al-1.2 C steel microalloyed with Ti/B after autogenous gas tungsten arc welding (GTAW). Microtensile specimens were extracted from the fusion zone (FZ) and two heat-affected zones (HAZ-1 and HAZ-2) and evaluated through optical and electron microscopy, electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and Vickers microhardness testing. The welded joint exhibited dendritic austenite in the FZ and equiaxed austenite with κ-carbide precipitation in the HAZs. The FZ showed the lowest mechanical performance (YS 395 MPa, UTS 534 MPa, elongation 45%), whereas HAZ-1 and HAZ-2 exhibited strengthening associated with κ-carbides and TiC/AlN precipitates (UTS up to 671 MPa). Strain-hardening analysis using Hollomon and Ludwick models indicated a higher hardening capacity in the HAZs. The findings demonstrate how welding thermal cycles control precipitation, microstructural morphology, and mechanical response in LD steels, providing insight for improved weldability and performance of lightweight structural components.