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Nanoscale precipitation in hot rolle...

Sun, Jun.

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Nanoscale precipitation in hot rolled sheet steel.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Nanoscale precipitation in hot rolled sheet steel./
作者:	Sun, Jun.
面頁冊數:	104 p.
附註:	Source: Masters Abstracts International, Volume: 51-05.
Contained By:	Masters Abstracts International51-05(E).
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1535561
ISBN:	9781303015823

Nanoscale precipitation in hot rolled sheet steel.
Sun, Jun.

Nanoscale precipitation in hot rolled sheet steel. - 104 p.

Source: Masters Abstracts International, Volume: 51-05.

Thesis (M.S.)--Colorado School of Mines, 2013.

Some newer hot rolled high strength low alloy (HSLA) steels with a single phase ferrite matrix have obtained substantial strengthening from nanoscale precipitation. These HSLA are reported to have a good combination of strength, ductility and hole-expansion ability. In the current work, Gleeble RTM 3500 torsion testing was employed to simulate the hot rolling process with varying run-out table cooling rates and coiling temperatures on five microalloyed steels with additions of Ti, Nb, Mo, Cr and V, to investigate the effects of microalloy additions and processing conditions on microstructures as well as mechanical properties. Subsized tensile specimens obtained from as-twisted torsion samples were used to evaluate mechanical properties. The precipitation states of the five steels with different processing conditions were characterized using extraction replica TEM. Comparison of microstructures and mechanical properties was discussed.

ISBN: 9781303015823Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Nanoscale precipitation in hot rolled sheet steel.
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245 1 0 $a Nanoscale precipitation in hot rolled sheet steel.
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500 $a Source: Masters Abstracts International, Volume: 51-05.
500 $a Adviser: John G. Speer.
502 $a Thesis (M.S.)--Colorado School of Mines, 2013.
520 $a Some newer hot rolled high strength low alloy (HSLA) steels with a single phase ferrite matrix have obtained substantial strengthening from nanoscale precipitation. These HSLA are reported to have a good combination of strength, ductility and hole-expansion ability. In the current work, Gleeble RTM 3500 torsion testing was employed to simulate the hot rolling process with varying run-out table cooling rates and coiling temperatures on five microalloyed steels with additions of Ti, Nb, Mo, Cr and V, to investigate the effects of microalloy additions and processing conditions on microstructures as well as mechanical properties. Subsized tensile specimens obtained from as-twisted torsion samples were used to evaluate mechanical properties. The precipitation states of the five steels with different processing conditions were characterized using extraction replica TEM. Comparison of microstructures and mechanical properties was discussed.
520 $a Characterization of the microstructure via light optical microscopy showed the matrix microstructure was mainly influenced by coiling temperature, which indicates that the transformation from austenite to ferrite occurred during the coiling period. A higher Ti content was shown to reduce the second constituent fractions. Investigation of carbon extraction replica specimens via TEM revealed the presence of nanoscale precipitation. Extensive nanoscale precipitation was observed in most of the specimens having a polygonal ferrite matrix, while in the granular bainite/ferrite microstructure at lower temperatures, fewer microalloy carbides were present. The specimens with polygonal ferrite had similar or higher yield strength than the specimens with granular bainite microstructure, which suggests the effectiveness of precipitation strengthening from extensive nanoscale precipitates. In the Nb-Mo steel, more significant strengthening due to grain refinement was evident. Yield strength values were less than reported for JFE's "NANOHITENRTM" steel in specimens with similar microstructure (polygonal ferrite matrix with extensive nanoscale precipitation).
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710 2 $a Colorado School of Mines. $b Metallurgical and Materials Engineering. $3 2093645
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