Aluminum alloy forged material for automotive vehicles and production method for the material

一种制造方法、铝合金的技术，应用在汽车用铝合金锻造材及其制造领域，能够解决耐腐蚀性低等问题，达到抗拉强度优异、屈服强度和延伸率优异、维持耐腐蚀性的效果

Inactive Publication Date: 2013-10-23
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the Al alloy extruded material described in Patent Document 1 has a relatively high Cu content, and although the strength is high, it is estimated that the level of corrosion resistance is low.

Method used

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  • Aluminum alloy forged material for automotive vehicles and production method for the material
  • Aluminum alloy forged material for automotive vehicles and production method for the material
  • Aluminum alloy forged material for automotive vehicles and production method for the material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11、 comparative example 1～21

[0132] Before the casting process, Al alloys having various alloy compositions shown in Table 1 were used for casting by hot top casting at a heating temperature of 720° C. and a casting speed of 30 mm / min. The obtained ingot had a diameter of φ300 mm. Thereafter, the ingot was heated at a heating rate of 1.5° C. / min, held at 540° C.×8 hours, cooled to 300° C. or lower at 3° C. / min., and subjected to homogenization heat treatment.

[0133] Then, it heated to 520 degreeC using the air furnace, and held it for 1.5 hours, and heat-processed. Next, the heat-treated ingot was not cooled, but was directly extruded using an extruder under the following conditions.

[0134] Extrusion temperature: 500°C, extrusion ratio: 21.3, extrusion speed: 3m / min

[0135] The extrusion-processed molded article was heated to 520° C. using an air furnace and held for 1.5 hours to perform heat treatment. The heat-treated molded product is not cooled, but the following forging process is performed. ...

Embodiment 12～17、 comparative example 22～53

[0146] Before the casting process, the aluminum alloy with the composition described in Example 3 of Table 1, that is, Si: 1.20 mass%, Fe: 0.45 mass%, Cu: 0.07 mass%, Mg: 1.00 mass%, Ti: 0.02 mass% was used , Zn: less than 0.02% by mass, Mn: 0.65% by mass, Cr: 0.20% by mass, Zr: less than 0.01% by mass, the amount of hydrogen is 0.15ml / 100gAl, and the balance is composed of Al and unavoidable impurities. Using the production conditions described in Table 3, aluminum alloy forged materials were produced in the same manner as in Examples 1 to 11. The production conditions other than those described in Table 3 were the same as in Examples 1-11.

[0147] From the Al alloy forged material thus obtained, in the same manner as in Examples 1 to 11, the figure 2 In the positions shown, the test piece for the tensile test and the test piece for stress corrosion cracking resistance (SCC) evaluation (C ring) were extracted.

[0148] The obtained forged materials were evaluated for tens...

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Abstract

An aluminum alloy forged material for automotive vehicles comprises 0.6ˆ¼1.2 mass% of Mg, 0.7ˆ¼1.5 mass% of Si, 0.1ˆ¼0.5 mass% of Fe, 0.01ˆ¼0.1 mass% of Ti, 0.3ˆ¼1.0 mass% of Mn, at least one of 0.1ˆ¼0.4 mass% of Cr and 0.05ˆ¼0.2 mass% of Zr, a restricted amount of Cu that is less than or equal to 0.1 mass%, a restricted amount of Zn that is less than or equal to 0.05 mass %, a restricted amount of H that is less than or equal to 0.25 ml in 100g A1 and a remainder of A1 and inevitably contained impurities, and the material includes precipitated crystalline particles among which the largest one has a maximum equivalent circle diameter equal to or less than 8 µm and an area ratio of the precipitated crystalline particles is equal to or less than 3.6%.

Description

technical field [0001] The present invention relates to an aluminum alloy forged material for automobiles suitable for use in chassis members and structural members for automobiles, and a method for producing the same. Background technique [0002] Conventionally, aluminum alloys such as 6000 series (Al-Mg-Si series) specified in JIS standards or AA standards have been used in structural members of transportation vehicles such as vehicles, ships, airplanes, motorcycles, and automobiles ( Hereinafter, it is simply expressed as "Al alloy".). This 6000-series aluminum alloy is relatively excellent in corrosion resistance, and scrap can be reused as a raw material for melting the 6000-series aluminum alloy, which is also excellent in terms of recyclability. [0003] In addition, in automotive structural members, aluminum alloy cast materials and aluminum alloy forged materials are used from the viewpoint of reduction in manufacturing costs and processing into parts with complex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/02C22C21/08C22F1/04C22F1/043C22F1/047C22F1/05
CPCC22F1/047C22F1/05C22C21/08C22C21/04C22C21/00
Inventor 堀雅是稻垣佳也中井学
Owner KOBE STEEL LTD
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