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Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg
Liu, YJ; Liu, Z; Jiang, Y; Wang, GW; Yang, Y; Zhang, LC; Zhang, LC (reprint author), Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.; Yang, Y (reprint author), Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China.
2018-02-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume735Pages:1414-1421
AbstractIt is known that metal parts can be made stronger, tougher and better wear resistance by introducing gradient microstructure. This work reports the cooling rate of melt pool induced discrepancy in microstructural gradient and element distribution during selective laser melting (SLM), thereby resulting in decrease in microhardness and wear resistance from surface to inside with a range of similar to 100 mu m of SLMmanufactured AlSi10Mg alloy. The cooling rate in the top surface of melt pool reaches similar to 1.44 x 10(6) K/s, which is much higher than that at the bottom (<= 1 x 10(3) K/s). Such a difference in cooling rate of melt pool is the main cause for forming gradient microstructure in terms of the distribution of Si particles, dendrite size, sub-grains and sub-boundaries. The variation in microstructure of SLM-produced AlSi10Mg alloy, as a result of gradient cooling rate, has a significant impact on its mechanical properties. Compared with core area, the surface area with a higher cooling rate is composed of finer Si particles, dendritic structure and more sub-boundaries, resulting in higher microhardness and greater wear resistance. The mechanism for formation of gradient microstructure and its influence on the mechanical properties are discussed, which provide new and deep insight into fabricating SLM-produced components with gradient microstructure. (C) 2017 Elsevier B.V. All rights reserved.; It is known that metal parts can be made stronger, tougher and better wear resistance by introducing gradient microstructure. This work reports the cooling rate of melt pool induced discrepancy in microstructural gradient and element distribution during selective laser melting (SLM), thereby resulting in decrease in microhardness and wear resistance from surface to inside with a range of similar to 100 mu m of SLMmanufactured AlSi10Mg alloy. The cooling rate in the top surface of melt pool reaches similar to 1.44 x 10(6) K/s, which is much higher than that at the bottom (<= 1 x 10(3) K/s). Such a difference in cooling rate of melt pool is the main cause for forming gradient microstructure in terms of the distribution of Si particles, dendrite size, sub-grains and sub-boundaries. The variation in microstructure of SLM-produced AlSi10Mg alloy, as a result of gradient cooling rate, has a significant impact on its mechanical properties. Compared with core area, the surface area with a higher cooling rate is composed of finer Si particles, dendritic structure and more sub-boundaries, resulting in higher microhardness and greater wear resistance. The mechanism for formation of gradient microstructure and its influence on the mechanical properties are discussed, which provide new and deep insight into fabricating SLM-produced components with gradient microstructure. (C) 2017 Elsevier B.V. All rights reserved.
description.department[liu, y. j. ; zhang, l. c.] edith cowan univ, sch engn, 270 joondalup dr, perth, wa 6027, australia ; [liu, z. ; jiang, y. ; wang, g. w.] chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [yang, y.] chinese acad sci, fujian inst res struct matter, key lab optoelect mat chem & phys, fuzhou 350002, fujian, peoples r china ; [yang, y.] peking univ, shenzhen inst, shenzhen key lab human tissue regenerat & repair, shenzhen 518057, peoples r china
KeywordAl-si Alloys Porous Structures Heat-treatment Fatigue Behavior Al-12si Alloy Ti-6al-4v Texture Composites Powder
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationShenzhen Fundamental Research [JCYJ 20160427170611414]; Australian Research Council [DP110101653]; ECU-PRS (International) Scholarship
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79489
Collection中国科学院金属研究所
Corresponding AuthorZhang, LC (reprint author), Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.; Yang, Y (reprint author), Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China.
Recommended Citation
GB/T 7714
Liu, YJ,Liu, Z,Jiang, Y,et al. Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,735:1414-1421.
APA Liu, YJ.,Liu, Z.,Jiang, Y.,Wang, GW.,Yang, Y.,...&Yang, Y .(2018).Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg.JOURNAL OF ALLOYS AND COMPOUNDS,735,1414-1421.
MLA Liu, YJ,et al."Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg".JOURNAL OF ALLOYS AND COMPOUNDS 735(2018):1414-1421.
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