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<p>A comparative study was conducted to examine the microstructure, mechanical, and corrosion properties of a 316L deposit fabricated via additive friction stir deposition. The deposit displayed a uniform and refined grain structure in addition to a higher microhardness (202 HV<sub>1</sub>) and ultimate tensile strength (685&#xa0;MPa), which are approximately 1.1 and 1.3 times greater than those of the 316L feedstock, respectively, attributing to the grain refinement and grain boundary strengthening effects. In contrast, the 316L deposit indicated a reduced electrochemical behavior in the NaCl solution as compared to the 316L feedstock. The thinner and more unstable passive film formed on the surface was the main reason for the enhancement of the corresponding corrosion rate expect for the micro-galvanic corrosion behavior, as demonstrated by scanning electron microscopy, electronic differential system and scanning electrochemical microscopy detection methods.</p>

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Microstructure, mechanical and corrosion properties of 316L deposition fabricated via additive friction stir deposition

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Q. Qiao,
  • J. Chen,
  • H. Tai,
  • Y.Y. Wong,
  • D. Dong,
  • D. Guo,
  • H. C. Qian,
  • Z. Li,
  • D. Zhang,
  • C. T. Kwok,
  • L. M. Tam

摘要

A comparative study was conducted to examine the microstructure, mechanical, and corrosion properties of a 316L deposit fabricated via additive friction stir deposition. The deposit displayed a uniform and refined grain structure in addition to a higher microhardness (202 HV1) and ultimate tensile strength (685 MPa), which are approximately 1.1 and 1.3 times greater than those of the 316L feedstock, respectively, attributing to the grain refinement and grain boundary strengthening effects. In contrast, the 316L deposit indicated a reduced electrochemical behavior in the NaCl solution as compared to the 316L feedstock. The thinner and more unstable passive film formed on the surface was the main reason for the enhancement of the corresponding corrosion rate expect for the micro-galvanic corrosion behavior, as demonstrated by scanning electron microscopy, electronic differential system and scanning electrochemical microscopy detection methods.