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<p>For developing the suitable heat treatment for binder jetting additive manufactured (BJAM) 17-4PH stainless steel (17-4PH SS) to improve the mechanical properties, the evolutions of microstructure and strengthening behavior of sintered samples were specifically studied after solution and solution-aging heat treatments. The obtained results indicated that the grain boundary distribution proportion and grain size presented unobvious differences among samples. While, the δ-Fe content decreased in samples after both solution and solution-aging heat treatments, and the activation of {110} &lt; 110 &gt; slip system increased after heat treatments, resulting in the increase in toughness, the elongation rates reached 14.1% and 14.4%, respectively, whereas the original sample exhibited an elongation of 13.4% under identical testing conditions. Relying on the hybrid strengthening mechanism composed of precipitation strengthening from Cu-rich precipitates and the dislocation strengthening, sample after solution-aging heat treatment presented the highest tensile strength. A significant strength enhancement to 1100&#xa0;MPa was achieved, marking a ~ 39% improvement over the baseline(791&#xa0;MPa), achieving toughening and strengthening synchronously.</p>

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Synchronously Strengthening and Toughening the Binder Jet Additive Manufactured 17-4PH Stainless Steel Based on the Solution and Aging Heat Treatment

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Xin Chen,
  • Junming Liu,
  • Yaoyao Feng,
  • Tianyi Zhang

摘要

For developing the suitable heat treatment for binder jetting additive manufactured (BJAM) 17-4PH stainless steel (17-4PH SS) to improve the mechanical properties, the evolutions of microstructure and strengthening behavior of sintered samples were specifically studied after solution and solution-aging heat treatments. The obtained results indicated that the grain boundary distribution proportion and grain size presented unobvious differences among samples. While, the δ-Fe content decreased in samples after both solution and solution-aging heat treatments, and the activation of {110} < 110 > slip system increased after heat treatments, resulting in the increase in toughness, the elongation rates reached 14.1% and 14.4%, respectively, whereas the original sample exhibited an elongation of 13.4% under identical testing conditions. Relying on the hybrid strengthening mechanism composed of precipitation strengthening from Cu-rich precipitates and the dislocation strengthening, sample after solution-aging heat treatment presented the highest tensile strength. A significant strength enhancement to 1100 MPa was achieved, marking a ~ 39% improvement over the baseline(791 MPa), achieving toughening and strengthening synchronously.