Zobrazeno 1 - 10
of 20
pro vyhledávání: '"David H. St. John"'
Autor:
Gan Li, Qiang Zhu, Ming-Xing Zhang, Tao Wu, Qiyang Tan, Wenying Qu, Xianliang Yang, Feng Wang, Jingqi Zhang, Yingang Liu, Yu Yin, Arvind Prasad, David H. St. John, Shiyang Liu
Publikováno v:
SSRN Electronic Journal.
Grain refinement is one of the most effective approaches to improving mechanical properties, reducing anisotropy and hot-cracking of additively manufactured alloys. Recent studies have shown that the extreme solidification conditions associated with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af23d8e158e05e1aa05e3c7cb577b484
https://doi.org/10.2139/ssrn.3869172
https://doi.org/10.2139/ssrn.3869172
Autor:
David H. St. John, Yunhu Zhang, Qijie Zhai, Matthew S. Dargusch, Dingpu Wang, Gui Wang, Jie Sun, Cheng Sheng
Publikováno v:
Journal of Alloys and Compounds. 753:543-550
This paper investigates the correlations between interfacial reaction, crystallographic orientation relationship on the interface and the required undercooling for nucleation on different crystallographic planes of MgO. Thermal analysis and high reso
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e802be11a15112d9aeb61d842ddc77b6
https://doi.org/10.1016/j.jallcom.2018.04.263
https://doi.org/10.1016/j.jallcom.2018.04.263
Autor:
Matthew S. Dargusch, David H. St. John, Stuart McDonald, Michael Bermingham, Sri Mereddy, Arvind Prasad
Publikováno v:
Key Engineering Materials. 770:155-164
It is well established that columnar grain structures usually form when metal alloys are used to additively manufacture components. A challenging goal is to produce an equiaxed grain structure throughout the component to remove anisotropy and refine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66e6f8e186b5162ff53e843514ca877d
https://doi.org/10.4028/www.scientific.net/kem.770.155
https://doi.org/10.4028/www.scientific.net/kem.770.155
Publikováno v:
Metallurgical and Materials Transactions A. 49:1444-1449
The columnar-to-equiaxed transition and remarkable refinement of β-Ti grains occur in an as-cast Ti-13Mo alloy when a new grain refiner, ZrN, was inoculated at a nitrogen level as low as 0.4 wt pct. The grain refining effect is attributed to in situ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d88dfb53783c0fa6ca8c1269fdd063fc
https://doi.org/10.1007/s11661-018-4531-5
https://doi.org/10.1007/s11661-018-4531-5
Grain refinement is a critical technology for the successful production of cast parts; whether that be preforms such as extrusion billet or rolling slab, or near net-shape castings. A refined microstructure has many advantages with reduced defects an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5d49bfcaafcd20316abed75945be1a7
https://doi.org/10.1201/9781351045636-140000241
https://doi.org/10.1201/9781351045636-140000241
Publikováno v:
Materials & Design, Vol 85, Iss, Pp 256-265 (2015)
This study investigates the mechanical properties and the deformation mechanisms active in Ti–25Nb–3Mo–3Zr–2Sn fine tubes. Ti–25Nb–3Mo–3Zr–2Sn alloy is a recently developed metastable β titanium alloy intended for biomedical applicat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fed43ff74af9d78ca524bd97d3ee2a1
http://www.sciencedirect.com/science/article/pii/S0264127515300150
http://www.sciencedirect.com/science/article/pii/S0264127515300150
Publikováno v:
Journal of the Mechanical Behavior of Biomedical Materials. 42:207-218
The processing of Ti-25Nb-3Mo-3Zr-2Sn tubes with outside diameters of 5.6-8.0 mm and wall-thicknesses of 0.7-1.0 mm were investigated in order to study the evolution of microstructure and mechanical properties and their impact on the processing of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99ee96822083e5271a96f6831bace393
https://doi.org/10.1016/j.jmbbm.2014.11.013
https://doi.org/10.1016/j.jmbbm.2014.11.013
Publikováno v:
Materials Science Forum. :161-166
Recent work has extended the Interdependence Model to the prediction of grain size of aluminium alloys when refined by Al-Ti-B master alloys. The relative contribution of Ti solute and TiB2 particles to the as-cast grain size was determined indicatin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b81fae4c0cec9fa4af9bf1ebf33defd
https://doi.org/10.4028/www.scientific.net/msf.794-796.161
https://doi.org/10.4028/www.scientific.net/msf.794-796.161
Publikováno v:
Materials Science Forum. 765:77-81
The Interdependence Theory is based on the concept that grain refinement of an alloy during the initial transient of solidification is governed by the simultaneous occurrence of growth of an already nucleated grain and the associated Constitutional S
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70a91c9500eb113f1c4c69dea40ac51f
https://doi.org/10.4028/www.scientific.net/msf.765.77
https://doi.org/10.4028/www.scientific.net/msf.765.77
Publikováno v:
Materials Science Forum. 690:481-484
Machining titanium is challenging due to its low thermal conductivity which results in very high temperatures at the tool/workpiece interface and in addition there is a tendency for titanium to react with most cutting materials, resulting in surface
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a84433e3b51f65e4fdf6ea64f47fe3a8
https://doi.org/10.4028/www.scientific.net/msf.690.481
https://doi.org/10.4028/www.scientific.net/msf.690.481