Scholarlink

<p>316L stainless steel is a common material in laser powder bed fusion (PBF-LB) additive manufacturing (AM). There are a variety of commercial hardware platforms and different processing parameters used to produce PBF-LB 316L components, so a wide range of microstructures and mechanical properties is expected. In this work, 316L plates were produced with four different commercial PBF-LB platforms using manufacturer default parameters to investigate the key processing parameters and machine hardware that affect tensile behavior. Heat transfer process simulations were used to predict solidification structure morphology and size scale and were validated with stereology of dendrites imaged with electron microscopy. The tensile testing results showed up to 62&#xa0;MPa difference in yield strength, 71&#xa0;MPa difference in ultimate tensile strength, and 22 pct difference in total elongation between different platforms. Together with tensile testing, it was determined that the size scale of the solidification structure alone was not sufficient to explain the macroscopic yielding behavior. Solid solution, boundary, and dislocation strengthening were used in a strengthening mechanisms model to successfully estimate yielding trends. The AM microstructure with the narrowest distribution of grains, finest area-weighted average grain size, and highest dislocation density resulted in the highest strength values. This work showed that 316L manufactured across four PBF-LB platforms with default processing parameters contains variations in the microstructural features which influence the relative proportion of strengthening mechanisms and contribute to macroscopic yielding behavior.</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

Rationalizing Different Microstructures and Yield Strengths of Cross-Platform Laser Powder Bed Fusion 316L

  • 期刊论文

  • 发表日期：

    2025年7月8日

查看全文
  • Matthew Schreiber,
  • Jorge A Ramirez,
  • Garrison Hommer,
  • Ye Jin,
  • Charles Smith,
  • Jonah Klemm-Toole,
  • Craig Brice,
  • Joy Gockel

摘要

316L stainless steel is a common material in laser powder bed fusion (PBF-LB) additive manufacturing (AM). There are a variety of commercial hardware platforms and different processing parameters used to produce PBF-LB 316L components, so a wide range of microstructures and mechanical properties is expected. In this work, 316L plates were produced with four different commercial PBF-LB platforms using manufacturer default parameters to investigate the key processing parameters and machine hardware that affect tensile behavior. Heat transfer process simulations were used to predict solidification structure morphology and size scale and were validated with stereology of dendrites imaged with electron microscopy. The tensile testing results showed up to 62 MPa difference in yield strength, 71 MPa difference in ultimate tensile strength, and 22 pct difference in total elongation between different platforms. Together with tensile testing, it was determined that the size scale of the solidification structure alone was not sufficient to explain the macroscopic yielding behavior. Solid solution, boundary, and dislocation strengthening were used in a strengthening mechanisms model to successfully estimate yielding trends. The AM microstructure with the narrowest distribution of grains, finest area-weighted average grain size, and highest dislocation density resulted in the highest strength values. This work showed that 316L manufactured across four PBF-LB platforms with default processing parameters contains variations in the microstructural features which influence the relative proportion of strengthening mechanisms and contribute to macroscopic yielding behavior.