Journal
MATERIALS LETTERS
Volume 284, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2020.128908
Keywords
316L stainless steel; Grain boundaries; Geometric dimension; Microstructure; Impact property
Funding
- China Postdoctoral Science Foundation [2020TQ0300]
- National Natural Science Foundation of China [51741106, 52071180]
- Natural Science Foundation of Jiangsu Province [BK20191292]
- Scientific Research Starting Foundation of Anhui Polytechnic University of China [2020YQQ009, 2020YQQ026]
- Foundation of Key Laboratory of National Defense Science and Technology [6142005180208]
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The impact properties of 316L stainless steel are influenced by geometric dimension and grain size. Larger samples exhibit higher impact toughness and larger dimples in the plain-strain region. This is due to the formation of larger dimples in large-sized grains with smaller grain boundaries, leading to higher impact energy consumption and toughness.
The effects of geometric dimension and grain size on impact properties of 316L stainless steel were clearly revealed based on the analysis of impact properties and fracture morphologies. Results showed that the large Charpy impacting samples exhibited a higher impact toughness than the small samples, which was ascribed to the higher value of Splain-strain/S-total (70-80%). The mean size of the dimples in the plain-strain region increased with the increasing of grain size. For large-sized grains with smaller grain boundaries, the cracks are prone to form larger dimples during the propagation process, which can consume a high impact energy accompanied by a high impact toughness. (c) 2020 Elsevier B.V. All rights reserved.
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