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<p>To improve the purity of DZ125 superalloy scraps, it is very important to select the appropriate pretreatment processes for the efficiency of the subsequent electron beam smelting (EBS) process. This study systematically compares the effects of three pretreatment processes, including sandblasting, acid pickling and alkaline washing, on the surface purity of scraps and the subsequent effectiveness of EBS. Sandblasting can effectively remove surface oxide layers. Under the condition of a sandblasting pressure of 0.7&#xa0;MPa for 2&#xa0;min, the oxygen and nitrogen contents decreased by 74.8% and 67.6%, respectively. Among the chemical routes, acid pickling in a 40&#xa0;wt.% H<sub>2</sub>SO<sub>4</sub> solution achieved the best impurity removal, with oxygen and nitrogen removal efficiencies of 92.3% and 88.5%, respectively. In contrast, alkaline washing showed limited decontamination capability and could not meet the requirements for high-purity smelting. After EBS, the oxygen content in the ingots prepared from untreated, sandblasted, and acid-pickled scraps decreased to 11.4, 7.9, and 3.7&#xa0;ppmw, respectively, while the nitrogen content of all ingots was below 0.1&#xa0;ppmw. These results demonstrate that EBS is highly effective in removing residual impurities and non-metallic inclusions from DZ125 scraps, and that acid pickling provides the most favorable pretreatment for achieving low impurity levels in the final ingots.</p> Graphical Abstract <p></p>

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Effect of Pretreatment Processes on the Purity of DZ125 Superalloy Scraps for Electron Beam Smelting

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Caixia Wang,
  • Yi Tan,
  • Xinpeng Zhuang,
  • Jinxia Song,
  • Chengjiang Zhang,
  • Pengting Li,
  • Yi Li

摘要

To improve the purity of DZ125 superalloy scraps, it is very important to select the appropriate pretreatment processes for the efficiency of the subsequent electron beam smelting (EBS) process. This study systematically compares the effects of three pretreatment processes, including sandblasting, acid pickling and alkaline washing, on the surface purity of scraps and the subsequent effectiveness of EBS. Sandblasting can effectively remove surface oxide layers. Under the condition of a sandblasting pressure of 0.7 MPa for 2 min, the oxygen and nitrogen contents decreased by 74.8% and 67.6%, respectively. Among the chemical routes, acid pickling in a 40 wt.% H2SO4 solution achieved the best impurity removal, with oxygen and nitrogen removal efficiencies of 92.3% and 88.5%, respectively. In contrast, alkaline washing showed limited decontamination capability and could not meet the requirements for high-purity smelting. After EBS, the oxygen content in the ingots prepared from untreated, sandblasted, and acid-pickled scraps decreased to 11.4, 7.9, and 3.7 ppmw, respectively, while the nitrogen content of all ingots was below 0.1 ppmw. These results demonstrate that EBS is highly effective in removing residual impurities and non-metallic inclusions from DZ125 scraps, and that acid pickling provides the most favorable pretreatment for achieving low impurity levels in the final ingots.

Graphical Abstract