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<p>The differences in microstructure and mechanical behavior between the wrought and electron-beam additively manufactured (EBAM) specimens of the AISI 321 stainless steel and CuSi3Mn1 copper-based alloys are studied, with a&#xa0;focus on the crack growth characteristics. The microstructure is examined using transmission electron microscopy. The mechanical properties are evaluated by the Vickers microhardness testing, static tensile tests, and fatigue crack growth experiments on compact tension specimens. The fatigue crack growth behavior is analyzed using a&#xa0;threshold stress intensity factor (SIF) range (∆<i>K</i><sub><i>th</i></sub>) and a&#xa0;regression analysis of the latter versus the fatigue crack growth rate (<i>da</i>/<i>dN</i>). The EBAM AISI 321 steel exhibits lower tensile and yield strengths but higher microhardness and strain at failure, indicating an enhanced ductility and a&#xa0;reduced crack sensitivity. However, it shows a&#xa0;lower threshold stress intensity factor range compared to the wrought steel. The EBAM specimens of the CuSi3Mn1 alloy demonstrate significantly lower strength, yield stress, and microhardness, accompanied by an increased elongation at break. The increased ductility of the AM CuSi3Mn1 alloy corresponds to a&#xa0;higher threshold stress intensity factor range.</p>

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A comparative study of the wrought and EBAM alloys under static and fatigue loading

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • A. V. Eremin,
  • S. V. Panin,
  • M. V. Burkov,
  • A. A. Bogdanov,
  • P. Kumar,
  • R. Sunder

摘要

The differences in microstructure and mechanical behavior between the wrought and electron-beam additively manufactured (EBAM) specimens of the AISI 321 stainless steel and CuSi3Mn1 copper-based alloys are studied, with a focus on the crack growth characteristics. The microstructure is examined using transmission electron microscopy. The mechanical properties are evaluated by the Vickers microhardness testing, static tensile tests, and fatigue crack growth experiments on compact tension specimens. The fatigue crack growth behavior is analyzed using a threshold stress intensity factor (SIF) range (∆Kth) and a regression analysis of the latter versus the fatigue crack growth rate (da/dN). The EBAM AISI 321 steel exhibits lower tensile and yield strengths but higher microhardness and strain at failure, indicating an enhanced ductility and a reduced crack sensitivity. However, it shows a lower threshold stress intensity factor range compared to the wrought steel. The EBAM specimens of the CuSi3Mn1 alloy demonstrate significantly lower strength, yield stress, and microhardness, accompanied by an increased elongation at break. The increased ductility of the AM CuSi3Mn1 alloy corresponds to a higher threshold stress intensity factor range.