Enhancement of an additive-manufactured austenitic stainless steel by post-manufacture heat-treatment

Nan Chen, Guoqiang Ma, Wanquan Zhu, Andrew William Godfrey, Zhijian Shen, Guilin Wu*, Xiaoxu Huang

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effect of post-manufacture heat-treatment on the mechanical strength of an additively-manufactured austenitic stainless steel has been investigated. Microstructural investigations revealed that the as-manufactured material exhibited a multi-scale structure, composed of grains, cells, dislocations and nano-sized particles. Annealing at 400°C resulted in a 10% increase in yield strength, associated with the additional precipitation of a population of nano-sized silicates. Annealing at higher temperatures resulted in a decrease in strength, attributed primarily to the thermal instability of the cell structure in the as-manufactured material. The results demonstrate that by careful control of annealing conditions the structure and mechanical properties of additively-manufactured austenitic stainless steel can be optimized by post-manufacture heat-treatment.
Original languageEnglish
JournalMaterials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing
Volume759
Pages (from-to)65-69
ISSN0921-5093
DOIs
Publication statusPublished - 2019

Keywords

  • 316L stainless steel
  • Additive manufacturing
  • Heat-treatment
  • Mechanical properties
  • Orowan strengthening

Cite this

@article{501cb226a71144f0ae05836caceb9120,
title = "Enhancement of an additive-manufactured austenitic stainless steel by post-manufacture heat-treatment",
abstract = "The effect of post-manufacture heat-treatment on the mechanical strength of an additively-manufactured austenitic stainless steel has been investigated. Microstructural investigations revealed that the as-manufactured material exhibited a multi-scale structure, composed of grains, cells, dislocations and nano-sized particles. Annealing at 400°C resulted in a 10{\%} increase in yield strength, associated with the additional precipitation of a population of nano-sized silicates. Annealing at higher temperatures resulted in a decrease in strength, attributed primarily to the thermal instability of the cell structure in the as-manufactured material. The results demonstrate that by careful control of annealing conditions the structure and mechanical properties of additively-manufactured austenitic stainless steel can be optimized by post-manufacture heat-treatment.",
keywords = "316L stainless steel, Additive manufacturing, Heat-treatment, Mechanical properties, Orowan strengthening",
author = "Nan Chen and Guoqiang Ma and Wanquan Zhu and Godfrey, {Andrew William} and Zhijian Shen and Guilin Wu and Xiaoxu Huang",
year = "2019",
doi = "10.1016/j.msea.2019.04.111",
language = "English",
volume = "759",
pages = "65--69",
journal = "Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

Enhancement of an additive-manufactured austenitic stainless steel by post-manufacture heat-treatment. / Chen, Nan; Ma, Guoqiang; Zhu, Wanquan; Godfrey, Andrew William; Shen, Zhijian; Wu, Guilin; Huang, Xiaoxu.

In: Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing, Vol. 759, 2019, p. 65-69.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Enhancement of an additive-manufactured austenitic stainless steel by post-manufacture heat-treatment

AU - Chen, Nan

AU - Ma, Guoqiang

AU - Zhu, Wanquan

AU - Godfrey, Andrew William

AU - Shen, Zhijian

AU - Wu, Guilin

AU - Huang, Xiaoxu

PY - 2019

Y1 - 2019

N2 - The effect of post-manufacture heat-treatment on the mechanical strength of an additively-manufactured austenitic stainless steel has been investigated. Microstructural investigations revealed that the as-manufactured material exhibited a multi-scale structure, composed of grains, cells, dislocations and nano-sized particles. Annealing at 400°C resulted in a 10% increase in yield strength, associated with the additional precipitation of a population of nano-sized silicates. Annealing at higher temperatures resulted in a decrease in strength, attributed primarily to the thermal instability of the cell structure in the as-manufactured material. The results demonstrate that by careful control of annealing conditions the structure and mechanical properties of additively-manufactured austenitic stainless steel can be optimized by post-manufacture heat-treatment.

AB - The effect of post-manufacture heat-treatment on the mechanical strength of an additively-manufactured austenitic stainless steel has been investigated. Microstructural investigations revealed that the as-manufactured material exhibited a multi-scale structure, composed of grains, cells, dislocations and nano-sized particles. Annealing at 400°C resulted in a 10% increase in yield strength, associated with the additional precipitation of a population of nano-sized silicates. Annealing at higher temperatures resulted in a decrease in strength, attributed primarily to the thermal instability of the cell structure in the as-manufactured material. The results demonstrate that by careful control of annealing conditions the structure and mechanical properties of additively-manufactured austenitic stainless steel can be optimized by post-manufacture heat-treatment.

KW - 316L stainless steel

KW - Additive manufacturing

KW - Heat-treatment

KW - Mechanical properties

KW - Orowan strengthening

U2 - 10.1016/j.msea.2019.04.111

DO - 10.1016/j.msea.2019.04.111

M3 - Journal article

VL - 759

SP - 65

EP - 69

JO - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -