Improving mechanical properties of selective laser melted Co29Cr9W3Cu alloy by eliminating mesh-like random high-angle grain boundary - Details

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Abstract：

Selective　laser　melting　(SLM)　has　been　attracting　increasing　attention　as　a　suitable　route　for　fabricating　personalized　orthopedic　implants　to　address　patient–prosthesis　mismatches　and　has　been　used　for　producing　Co29Cr9W3Cu　alloys　in　our　previous　study.　However,　SLM　technology　can　result　in　the　formation　of　mesh-like　random　high-angle　grain　boundaries　(indicated　as　molten　pool　boundaries)　and　accumulation　of　residual　stress　in　the　microstructure,　possibly　causing　an　unstable　mechanical　property.　In　this　study,　the　research　on　the　relationship　between　microstructural　evolution　and　mechanical　properties　was　performed　on　the　SLM-produced　Co29Cr9W3Cu　alloys　with　different　heat　treatments　to　improve　the　reliable　mechanical　property　of　the　SLM-produced　Co29Cr9W3Cu　orthopedic　implants.　It　was　found　that　the　microstrucutre　with　mesh-like　random　high-angle　grain　boundaries　could　be　eliminated　during　recrystallization,　replaced　by　the　one　with　equiaxial　structure　containing　the　Σ3　grain　boundaries　(annealing　twin).　Most　importantly,　the　combined　effect　of　eliminating　the　mesh-like　random　high-angle　grain　boundaries　and　residual　stress　and　generating　the　Σ3　grain　boundary　contributed　to　an　increase　in　elongation　from　12.49%　of　the　as-SLM-produced　one　to　23.38%.　Proper　heat　treatment　is　considered　to　be　an　efficient　strategy　to　improve　the　mechanical　properties　of　the　SLM-produced　Co29Cr9W3Cu　alloy　with　a　desired　tensile　ductility.　©　2020　Elsevier　B.V.

Keyword：

Additive manufacturing; Biomaterials; Heat treatment; Residual stress; Selective laser melting

Community：

[ 1 ] [Lu, Y.]Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Rd West, Fuzhou, 350002, China
[ 2 ] [Lu, Y.]University of Chinese Academy of Sciences, Beijing, 100049, China
[ 3 ] [Zhao, W.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 4 ] [Yang, C.]Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Rd, Shenyang, 110016, China
[ 5 ] [Liu, Y.]School of Mechanical and Chemical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
[ 6 ] [Xiang, H.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 7 ] [Yang, K.]Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Rd, Shenyang, 110016, China
[ 8 ] [Lin, J.]Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Rd West, Fuzhou, 350002, China
[ 9 ] [Lin, J.]University of Chinese Academy of Sciences, Beijing, 100049, China

Reprint 's Address：

[Liu, Y.]School of Mechanical and Chemical Engineering, The University of Western Australia, Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 35 Stirling Highway, Australia

Email：

yujing.liu@uwa.edu.au

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Source ：

Materials Science and Engineering A

ISSN： 0921-5093

Year： 2020

Volume： 793

5 . 2 3 4

JCR@2020

6 . 1 0 0

JCR@2023

ESI HC Threshold：196

JCR Journal Grade：1

CAS Journal Grade：2

Cited Count：

WoS CC Cited Count：

SCOPUS Cited Count： 25

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 0

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