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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 4    April 2021

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Hall-Petch relationship in selective laser melting additively manufactured metals: using grain or cell size?
WANG Yin(王银), WANG Yue-ting(王悦婷), LI Rui-di(李瑞迪), NIU Peng-da(牛朋达), WANG Min-bo(王敏卜), YUAN Tie-chui(袁铁锤), LI Kun(李昆)

State Key Laboratory of Powder Metallurgy, Shenzhen Institute of Central South University,
Changsha 410083, China

Abstract:The mechanical properties of many materials prepared by additive manufacturing technology have been greatly improved. High strength is attributed to grain refinement, formation of high density dislocation and existence of cellular structures with nanoscale during manufacturing. In addition, the super-saturated solid solution of elements in the matrix and the solid solution segregation along the wall of the cellular structures also promote the improvement of strength by enhancing dislocation pinning. Hence, the existence of cellular structure in grains leads to differences in the prediction of material strength by Hall-Petch relationship, and there is no unified calculation method to determine the d value as grain size or cell size. In this work, representative materials including austenite 316L SS were printed by selective laser melting (SLM), and the strength was predicted. The values of cell size and grain size were substituted into Hall-Petch formula, and the results showed that the calculation error for 316L is increased from 4.1% to 11.9%. Therefore, it is concluded that the strength predicted by grain size is more accurate than that predicted by cell size in additive manufacturing materials. When calculating the yield strength of laser additive manufacturing metal materials through the Hall-Petch formula, the grain size should be used as the basis for calculation.

 

Key words: additive manufacturing; Hall-Petch relationship; grains; cellular structures; mechanical property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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