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<p>This paper investigates the effect of deep cryogenic treatment (DCT) on the microstructure and mechanical properties of heat-treated SLM-AlSi10Mg. Based on the analysis of microstructure and mechanical properties, the following conclusions are drawn: (1) The population of Si particles was significantly increased, their size was markedly refined, and their morphology was progressively reshaped into spherical forms after DCT. (2) After DCT, the average microhardness increases, with microhardness values increasing by 7.2 HV, 10.34 HV, and 13.66 HV for 6&#xa0;h, 12&#xa0;h, and 18&#xa0;h, respectively. (3) As the DCT time increases, the yield strength (YS), ultimate tensile strength (UTS), and elongation (TE) of SLM-AlSi10Mg show an increasing trend. When the DCT time is 18&#xa0;h, the YS and UTS are only slightly lower than those of the heat-treated samples, but the TE increases significantly from 9.9% to 16%. It can be seen that DCT significantly contributes to the improvement of the performance of SLM-AlSi10Mg.</p>

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The Effect of Cryogenic Treatment on the Microstructure and Mechanical Properties of SLM-AlSi10Mg

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Chunsheng Zou,
  • Haijun Pan,
  • Wenyu Tao,
  • Lin Liu,
  • Zhiqiang Wu,
  • Zhihui Cai

摘要

This paper investigates the effect of deep cryogenic treatment (DCT) on the microstructure and mechanical properties of heat-treated SLM-AlSi10Mg. Based on the analysis of microstructure and mechanical properties, the following conclusions are drawn: (1) The population of Si particles was significantly increased, their size was markedly refined, and their morphology was progressively reshaped into spherical forms after DCT. (2) After DCT, the average microhardness increases, with microhardness values increasing by 7.2 HV, 10.34 HV, and 13.66 HV for 6 h, 12 h, and 18 h, respectively. (3) As the DCT time increases, the yield strength (YS), ultimate tensile strength (UTS), and elongation (TE) of SLM-AlSi10Mg show an increasing trend. When the DCT time is 18 h, the YS and UTS are only slightly lower than those of the heat-treated samples, but the TE increases significantly from 9.9% to 16%. It can be seen that DCT significantly contributes to the improvement of the performance of SLM-AlSi10Mg.