ALUMINUM ALLOY FORGING MEMBER AND PROCESS FOR PRODUCING THE SAME

Title:

ALUMINUM ALLOY FORGING MEMBER AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2007/114078

Kind Code:

A1

Abstract:

This invention provides an aluminum alloy forging material, which has realized enhanced strength, enhanced toughness, and enhanced corrosion resistance, and a process for producing the same. The aluminum alloy forging material is produced so as to have a specific chemical composition under specific production conditions and is an aluminum alloy forging material (1) which has an arm part (2) of an approximately H shape in cross section and comprises a peripheral rib (3) having a relatively narrow width and a large thickness and a central web (4) having a small thickness of 10 mm or less and a relatively large width. The enhanced strength, enhanced toughness and enhanced corrosion resistance have been realized by specifying the density of a crystallized product observed in a microstructure in a cross-sectional site (7), where the maximum stress occurs, in the cross section in the widthwise direction at the maximum stress producing site in a rib (3a), the spacing between grain boundary precipitates observed in a microstructure at a cross-sectional site (8) including a parting line and the size and density of dispersed particles, the proportion of recrystallization observed in cross-sectional microstructures (7, 8) of the ribs, and the proportion of recrystallization observed in a cross-sectional microstructure (9)in the widthwise direction of the web (4a) adjacent to the cross-sectional microstructure of the rib (3a).

Inventors:

NAKAI MANABU
INAGAKI YOSHIYA
FUKUDA ATSUMI

Application Number:

PCT/JP2007/056024

Publication Date:

October 11, 2007

Filing Date:

March 23, 2007

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KOBE STEEL LTD (JP)
NAKAI MANABU
INAGAKI YOSHIYA
FUKUDA ATSUMI

International Classes:

C22C21/02; B21K7/12; C22C21/06; C22F1/05; C22F1/00

Foreign References:

JP2004084058A	2004-03-18
JP2006083437A	2006-03-30
JP2003277869A	2003-10-02
JP2001073056A	2001-03-21
JP2004292937A	2004-10-21
JPH07145440A	1995-06-06
JPH06256880A	1994-09-13
JP2000144296A	2000-05-26
JP2001107168A	2001-04-17
JP2002294382A	2002-10-09
JPH05247574A	1993-09-24
JP2002348630A	2002-12-04
JP2004043907A	2004-02-12
JP2004292937A	2004-10-21
JP2004292892A	2004-10-21

Other References: