Laser beam powder bed fusion and post processing of alloy 247LC

Adegoke, OlutayoHögskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW (författare)

10.7449/2019/MST_2019_27_34
Alloy 247LC is sensitive to cracking during laser beam powder bed fusion (PBF-LB) manufacturing. Post processing is thus required to close cracks and achieve desired properties. In this study, samples of Alloy 247LC were manufactured by PBF-LB and subsequently post processed by hot isostatic pressing (HIP), HIP + solution and ageing heat treatments. The microstructure was characterized. Results showed cracks in the as-built condition. Cracks were not detected after HIP. Bright microconstituents were observed in the region between the cells, mainly, because of the partitioning of Hf and Ta into the intercellular region, where they presumably form carbides. What is assumed to be oxides were prominent in the microstructure. Thermodynamic calculations showed rapid formation of ?’ precipitates in the alloy, due to the high total concentration of Al and Ta and this was linked to the high hardness values in the as-built condition. Â© 2019 MS&T19Â®

TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
Carbides; Cracks; Hot isostatic pressing; Microstructure; Tantalum
High hardness; Intercellular regions; Micro-constituents; Phases; Post processing; Powder bed; Thermodynamic calculations
Laser beams
Manufacturing and materials engineering
Produktions- och materialteknik

Andersson, Joel,1981-Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW(Swepub:hv)joan0056 (författare)
Ojo, Olanrewaju A.University of Manitoba, Winnipeg, Canada (författare)
Brodin, HåkanSiemens Industrial Turbomachinery AB, Finspang, Sweden (författare)
Pederson, RobertGKN Aerospace, Redditch, United Kingdom (författare)
Högskolan VästAvdelningen för avverkande och additativa tillverkningsprocesser (AAT) (creator_code:org_t)

Ingår i:MS and T 2019 - Materials Science and Technology: Materials Science and Technology, s. 27-349780873397704

Av författaren/redakt...: Adegoke, Olutayo; Andersson, Joel, ...; Ojo, Olanrewaju ...; Brodin, Håkan; Pederson, Robert

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