Scholarlink

<p>The Cold Metal Transfer Cycle Step (CMT-CS) process significantly reduces heat input, thereby enhancing control over surface quality, microstructure and properties during additive manufacturing. In this study, under a constant welding speed of 6 mm/s and a welding current of 140 A, the performances of the CMT and CMT-CS processes in the additive manufacturing of 316L stainless steel thin-walled structures were comparatively analyzed by varying the number of droplets and interval time. The results show that the CMT-CS process reduced the heat input from 299.23 J/mm (CMT) to a range of 138.18–184.40 J/mm. The lowest surface roughness of 55.11 μm was achieved at a heat input of 161.66 J/mm, while the highest effective deposition rate of 89.75% was obtained at 184.40 J/mm. As the heat input decreased, both the δ-Ferrite content and average microhardness increased, reaching 17.26% and 204.79 HV at the minimum heat input of 138.18 J/mm. Regarding mechanical properties, both vertical and horizontal tensile strengths increased as heat input decreased, reaching maximum values of 600.39 MPa and 537.47 MPa, with corresponding elongations of 45.20% and 47.49%, respectively. Overall, the CMT-CS process effectively reduces heat input and substantially enhances the surface quality, microstructure and properties of 316L stainless steel thin-walled parts.&#xa0;</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

Effect of CMT-CS additive manufacturing on the surface quality, microstructure and properties of 316L stainless steel

  • 期刊论文

  • 发表日期：

    2025年6月7日

查看全文
  • Mingzhen Liu,
  • Yongqiang Yang,
  • Changhui Song,
  • Zibin Liu,
  • Yang Li,
  • Shiqin Zhang

摘要

The Cold Metal Transfer Cycle Step (CMT-CS) process significantly reduces heat input, thereby enhancing control over surface quality, microstructure and properties during additive manufacturing. In this study, under a constant welding speed of 6 mm/s and a welding current of 140 A, the performances of the CMT and CMT-CS processes in the additive manufacturing of 316L stainless steel thin-walled structures were comparatively analyzed by varying the number of droplets and interval time. The results show that the CMT-CS process reduced the heat input from 299.23 J/mm (CMT) to a range of 138.18–184.40 J/mm. The lowest surface roughness of 55.11 μm was achieved at a heat input of 161.66 J/mm, while the highest effective deposition rate of 89.75% was obtained at 184.40 J/mm. As the heat input decreased, both the δ-Ferrite content and average microhardness increased, reaching 17.26% and 204.79 HV at the minimum heat input of 138.18 J/mm. Regarding mechanical properties, both vertical and horizontal tensile strengths increased as heat input decreased, reaching maximum values of 600.39 MPa and 537.47 MPa, with corresponding elongations of 45.20% and 47.49%, respectively. Overall, the CMT-CS process effectively reduces heat input and substantially enhances the surface quality, microstructure and properties of 316L stainless steel thin-walled parts.