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Aluminum alloy extrudate for cutting

A technology of aluminum alloy and extruded materials, which is applied in the field of aluminum alloy extruded materials for cutting, can solve the problems of increased wall thickness, increased part weight, and undesired needs, and achieves the goals of increasing yield, improving fatigue characteristics, and high-temperature strength Effect

Inactive Publication Date: 2015-02-11
KOBE STEEL LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0015] On the other hand, in high-speed rotating parts such as turbines, repeated loads occur in the radial direction of extruded materials with low fatigue strength. Here, in order to ensure the fatigue resistance of the parts, it is necessary to make the wall thickness Increase
However, this increases the weight of the part, which is not desirable as an automotive part requiring lightweight

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Embodiment Construction

[0029] Hereinafter, the aluminum alloy extruded material for cutting according to the present invention and its manufacturing method will be described more specifically.

[0030] [alloy composition]

[0031] Cu: 2.9 to 5.5% by mass

[0032] Cu is an indispensable element required for improving the room temperature and high temperature strength of an Al—Cu—Mg-based aluminum alloy extruded material. When the content of Cu is less than 2.9% by mass, the effect of improving the strength is small, and when the content exceeds 5.5% by mass, extrusion processability will deteriorate. Therefore, the Cu content is 2.9 to 5.5% by mass. Preferably it is 3.0-4.5 mass %, More preferably, it is 3.4-4.5 mass %.

[0033] Mg: 1.0 to 2.5% by mass

[0034] Like Cu, Mg is an indispensable element required to improve the room temperature and high temperature strength of the Al—Cu—Mg based aluminum alloy extruded material. When the content of Mg is less than 1.0% by mass, the effect of improvi...

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Abstract

The invention provides an aluminum alloy extrudate for cutting, having high fatigue strength relative to a direction (LT direction) vertical to an extrusion direction of an extrudate. The aluminum alloy extrudate includes: 2.9-5.5 mass% Cu, 1.0-2.5 mass% Mg, 0.5-3.0 mass% Ni, 0.5-1.5 mass% Fe, lower than 0.4 mass% Si, and 0.005-0.15 mass% Ti, also includes lower than total 0.7 mass% one or more than two of 0.05-0.6 mass% Mn, 0.05-0.3 mass% Cr, 0.05-0.3 mass% Zr and 0.05-0.3 mass% V, and the remainder is formed by Al and unavoidable impurities. When [sigma]WLT represents fatigue strength in the LT direction, [sigma]WL represents fatigue strength in the L direction (extrusion direction), TSLT represents tensile strength in the LT direction, and TSL represents tensile strength in the L direction, the formula (I) is satisfied. [sigma]WLT / TSLT>[sigma]WL / TSL (I).

Description

technical field [0001] The present invention relates to an aluminum alloy extruded material for cutting used in components such as engines and compressors of automobiles, and turbine (impeller) components, and particularly relates to a high fatigue strength in a direction (LT direction) perpendicular to the extrusion direction, Cutting aluminum alloy extrusions suitable for cutting extrusions to manufacture these components. Background technique [0002] Existing rotating and direct-moving components such as engines and compressors are manufactured by cutting cast and forged products of A2618 alloy. Extruded materials require improvement in machinability, strength and fatigue strength. [0003] On the other hand, Patent Documents 1 to 7 describe JIS2000 (Al—Cu—Mg)-based aluminum alloy extruded materials suitable for manufacturing parts such as engines and compressors. According to Patent Documents 1 to 7, these Al-Cu-Mg based aluminum alloy extruded materials, through the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C21/00C22F1/057C22F1/04
CPCB21C23/02C22C21/14C22C21/16C22F1/057
Inventor 志镰隆广吉原伸二
Owner KOBE STEEL LTD
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