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Systems design of transformation tou...

Saha, Arup.

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Systems design of transformation toughened blast-resistant naval hull steels.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Systems design of transformation toughened blast-resistant naval hull steels./
Author:	Saha, Arup.
Description:	245 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2582.
Contained By:	Dissertation Abstracts International65-05B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132594
ISBN:	0496798340

Systems design of transformation toughened blast-resistant naval hull steels.
Saha, Arup.

Systems design of transformation toughened blast-resistant naval hull steels. - 245 p.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2582.

Thesis (Ph.D.)--Northwestern University, 2004.

A systems approach to computational materials design has demonstrated a new class of ultratough, weldable secondary hardened plate steels combining new levels of strength and toughness while meeting processability requirements. A first prototype alloy has achieved property goals motivated by projected naval hull applications requiring extreme fracture toughness (Cv > 85 ft-lbs (115 J) corresponding to KId > 200 ksi.in1/2 (220 MPa.m1/2)) at strength levels of 150--180 ksi (1034--1241 MPa) yield strength in weldable, formable plate steels.

ISBN: 0496798340Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Systems design of transformation toughened blast-resistant naval hull steels.
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020 $a 0496798340
035 $a (UnM)AAI3132594
035 $a AAI3132594
040 $a UnM $c UnM
100 1 $a Saha, Arup. $3 1937726
245 1 0 $a Systems design of transformation toughened blast-resistant naval hull steels.
300 $a 245 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2582.
500 $a Adviser: Gregory B. Olson.
502 $a Thesis (Ph.D.)--Northwestern University, 2004.
520 $a A systems approach to computational materials design has demonstrated a new class of ultratough, weldable secondary hardened plate steels combining new levels of strength and toughness while meeting processability requirements. A first prototype alloy has achieved property goals motivated by projected naval hull applications requiring extreme fracture toughness (Cv > 85 ft-lbs (115 J) corresponding to KId > 200 ksi.in1/2 (220 MPa.m1/2)) at strength levels of 150--180 ksi (1034--1241 MPa) yield strength in weldable, formable plate steels.
520 $a A theoretical design concept was explored integrating the mechanism of precipitated nickel-stabilized dispersed austenite for transformation toughening in an alloy strengthened by combined precipitation of M2C carbides and BCC copper both at an optimal &sim;3nm particle size for efficient strengthening. This concept was adapted to plate steel design by employing a mixed bainitic/martensitic matrix microstructure produced by air-cooling after solution-treatment and constraining the composition to low carbon content for weldability. With optimized levels of copper and M2C carbide formers based on a quantitative strength model, a required alloy nickel content of 6.5 wt% was predicted for optimal austenite stability for transformation toughening at the desired strength level of 160 ksi (1100 MPa) yield strength. A relatively high Cu level of 3.65 wt% was employed to allow a carbon limit of 0.05 wt% for good weldability.
520 $a Hardness and tensile tests conducted on the designed prototype confirmed predicted precipitation strengthening behavior in quench and tempered material. Multi-step tempering conditions were employed to achieve the optimal austenite stability resulting in significant increase of impact toughness to 130 ft-lb (176 J) at a strength level of 160 ksi (1100 MPa). Comparison with the baseline toughness-strength combination determined by isochronal tempering studies indicates a transformation toughening increment of 60% in Charpy energy. Predicted Cu particle number densities and the heterogeneous nucleation of optimal stability high Ni 5 nm austenite on nanometer-scale copper precipitates in the multi-step tempered samples was confirmed using three-dimensional atom probe microscopy. Charpy impact tests and fractography demonstrate ductile fracture with C v > 90 ft-lbs (122 J) down to -40°C, with a substantial toughness peak at 25°C consistent with designed transformation toughening behavior. The properties demonstrated in this first prototype represent a substantial advance over existing naval hull steels.
590 $a School code: 0163.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Marine and Ocean. $3 1019064
690 $a 0794
690 $a 0547
710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 65-05B.
790 1 0 $a Olson, Gregory B., $e advisor
790 $a 0163
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132594