Scholarlink

<p>The in-situ TiC reinforced 316&#xa0;L stainless steel was fabricated via laser powder-bed fusion (LPBF) of the Ti<sub>3</sub>SiC<sub>2</sub>/ 316&#xa0;L powder mixture. The influence of laser scan speed on the microstructure evolution and corrosion behavior of composites in NaCl solution was investigated. The results show that Ti<sub>3</sub>SiC<sub>2</sub> particles experience the decomposition and transforming into rod-like TiC particles and free Si under high-temperature laser irradiation. The distribution of TiC in the interfacial areas is relied on the combined thermal forces of Marangoni force and viscous drag force as varying the scan speed. A relatively low scan speed of 1000&#xa0;mm/s tends to result in the outer-circular flow and resultant circular force, leading to the formation of rod-like TiC particles with a certain disorder distribution surrounding Ti<sub>3</sub>SiC<sub>2</sub>. But a high scan speed favors for the grain refinement of steel matrix due to the acquiring of a corresponding high cool rate, thus facilitating the formation of inner Cr<sub>2</sub>O<sub>3</sub> passive film. On the contrary, an increased number of oxides including SiO<sub>2</sub> and TiO<sub>2</sub> that are obtained using a low scan speed can improve the chemical stability of passive film. Hence, the enhancement of corrosion resistance of composite is dominated by the combined actions of grain reinforcement and the number of oxides of Si and Ti elements. Moreover, the underlying corrosion mechanism of composites in NaCl solution is elucidated to provide deeper insights into their corrosion 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

Microstructure evolution and corrosion behavior of in-situ tic reinforced stainless steel by laser powder-bed fusing of Ti3SiC2 decomposition: role of laser scan speed

  • 期刊论文

  • 发表日期：

    2026年2月17日

查看全文
  • Mujian Xia,
  • Congcong Pan,
  • Nianlian Li,
  • Man Zhang,
  • Aihui Liu

摘要

The in-situ TiC reinforced 316 L stainless steel was fabricated via laser powder-bed fusion (LPBF) of the Ti3SiC2/ 316 L powder mixture. The influence of laser scan speed on the microstructure evolution and corrosion behavior of composites in NaCl solution was investigated. The results show that Ti3SiC2 particles experience the decomposition and transforming into rod-like TiC particles and free Si under high-temperature laser irradiation. The distribution of TiC in the interfacial areas is relied on the combined thermal forces of Marangoni force and viscous drag force as varying the scan speed. A relatively low scan speed of 1000 mm/s tends to result in the outer-circular flow and resultant circular force, leading to the formation of rod-like TiC particles with a certain disorder distribution surrounding Ti3SiC2. But a high scan speed favors for the grain refinement of steel matrix due to the acquiring of a corresponding high cool rate, thus facilitating the formation of inner Cr2O3 passive film. On the contrary, an increased number of oxides including SiO2 and TiO2 that are obtained using a low scan speed can improve the chemical stability of passive film. Hence, the enhancement of corrosion resistance of composite is dominated by the combined actions of grain reinforcement and the number of oxides of Si and Ti elements. Moreover, the underlying corrosion mechanism of composites in NaCl solution is elucidated to provide deeper insights into their corrosion behavior.