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Design and Development of bcc-Copper...

Kapoor, Monica.

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Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel./
作者:	Kapoor, Monica.
面頁冊數:	122 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
Contained By:	Dissertation Abstracts International74-07B(E).
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3556617
ISBN:	9781267988577

Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel.
Kapoor, Monica.

Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel. - 122 p.

Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2013.

A series of high-strength low-carbon bcc-Cu- & B2-NiAl-precipitation-strengthened ferritic steels with Mn, Cu, Ni and Al were studied. The yield strength of these alloys increases with the amount of alloying elements. A maximum strength of 1600 MPa, with 12.40 at. % elements, is achieved which is about 30 % higher than the strength of previously reports NUCu (Northwestern Copper) alloys. All the alloys studied attain a maximum hardness within 1--2 h of aging at 500°C--550°C. Aging at a lower temperature and solution treating at a higher temperature can increase the hardness of all the alloys. The lower aging temperature is limited to 500°C by the slow precipitation kinetics observed at 400°C. The higher solution treatment temperature is limited to 1050°C by the adverse impact on toughness in dilute alloys.

ISBN: 9781267988577Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel.
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245 1 0 $a Design and Development of bcc-Copper- and B2 Nickel-Aluminium-Precipitation-Strengthened Ferritic Steel.
300 $a 122 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-07(E), Section: B.
500 $a Adviser: Yip-Wah Chung.
502 $a Thesis (Ph.D.)--Northwestern University, 2013.
520 $a A series of high-strength low-carbon bcc-Cu- & B2-NiAl-precipitation-strengthened ferritic steels with Mn, Cu, Ni and Al were studied. The yield strength of these alloys increases with the amount of alloying elements. A maximum strength of 1600 MPa, with 12.40 at. % elements, is achieved which is about 30 % higher than the strength of previously reports NUCu (Northwestern Copper) alloys. All the alloys studied attain a maximum hardness within 1--2 h of aging at 500°C--550°C. Aging at a lower temperature and solution treating at a higher temperature can increase the hardness of all the alloys. The lower aging temperature is limited to 500°C by the slow precipitation kinetics observed at 400°C. The higher solution treatment temperature is limited to 1050°C by the adverse impact on toughness in dilute alloys.
520 $a The primary strengthening contribution is due to combined precipitation of bcc Cu and NiAl-type intermetallic precipitates. The composition, structure and morphology evolution of the precipitates from the 1600 MPa alloy was studied using atom probe tomography and transmission electron microscopy, as a function of aging time at 550°C. Near the peak hardness, the equiaxed bcc Cu-alloyed precipitates have substantial amounts of Fe and are coherent with the Fe matrix. On subsequent aging, the Cu-alloyed precipitates are progressively enriched with Cu and elongate to transform to the 9R phase. The number density of the Cu-alloyed and NiAl-type precipitate is similar near peak hardness indicating that NiAl-type precipitates nucleate on Cu-alloyed precipitates. Almost all Cu-alloyed precipitates are enveloped on one side by ordered NiAl-type precipitates after aging from 2 h to 100 h. Cu-alloyed precipitates coarsen slower than NiAl-type precipitates because of three possible reasons: interfacial energy differences between the two types of precipitates, slower diffusion kinetics of Cu through the ordered B2 NiAl envelope around the bcc Cu-alloyed precipitate versus bcc Fe and solute transfer from Cu-alloyed precipitate to B2 NiAl. The relatively slow growth and coarsening of Cu-alloyed precipitate is consistent with the observation of modest decrease of hardness with aging in all the alloys studied.
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690 $a 0488
710 2 $a Northwestern University. $b Materials Science and Engineering. $3 1058406
773 0 $t Dissertation Abstracts International $g 74-07B(E).
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