EP2450462B1 - Wear-resistant aluminum alloy extruded material having excellent fatigue strength and cutting properties - Google Patents

Wear-resistant aluminum alloy extruded material having excellent fatigue strength and cutting properties Download PDF

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Publication number
EP2450462B1
EP2450462B1 EP10794039.7A EP10794039A EP2450462B1 EP 2450462 B1 EP2450462 B1 EP 2450462B1 EP 10794039 A EP10794039 A EP 10794039A EP 2450462 B1 EP2450462 B1 EP 2450462B1
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EP
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Prior art keywords
mass
extruded material
aluminum alloy
content
wear
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EP10794039.7A
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German (de)
English (en)
French (fr)
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EP2450462A4 (en
EP2450462A1 (en
Inventor
Karin Shibata
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Aisin Keikinzoku Co Ltd
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Aisin Keikinzoku Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

  • the present invention relates to a wear-resistant aluminum alloy extruded material that exhibits excellent fatigue strength in addition to excellent machinability.
  • the aluminum alloy extruded material When using an aluminum alloy extruded material for automotive brake parts and the like, the aluminum alloy extruded material is required to exhibit wear resistance against sliding parts, and may also required to exhibit high cutting (machining) accuracy and high caulking accuracy.
  • a cylinder, a hydraulic circuit groove, and the like are machined when producing an actuator body (ABS body) used for an automotive antilock brake system, an electronic stability control (ESC) body used for an antiskid brake system, and the like, and a caulking seal is provided after assembly.
  • ABS body actuator body
  • ESC electronic stability control
  • an aluminum alloy extruded material used for such applications is required to exhibit strength, wear resistance against sliding parts, machinability that allows processing into a complicated shape, pressure resistance against a hydraulic oil and the like (caulking section), and high fatigue strength against cyclic (repetitive) load.
  • An aluminum alloy extruded material used for such parts is provided with wear resistance and machinability by dispersing Si particles and Fe particles in the metal structure.
  • Such an aluminum alloy extruded material exhibits insufficient fatigue strength.
  • Patent Document 1 discloses a wear-resistant aluminum alloy extruded material that exhibits excellent machinability and corrosion resistance. However, the aluminum alloy extruded material disclosed in Patent Document 1 exhibits insufficient caulking properties, fatigue strength, and the like.
  • Patent Document 1 Japanese Patent No. 3886270
  • An object of the invention is to provide a wear-resistant aluminum alloy extruded material that exhibits excellent fatigue strength and excellent machinability.
  • a wear-resistant aluminum alloy extruded material that exhibits excellent fatigue strength and machinability
  • the aluminum alloy extruded material being formed using an aluminum alloy that comprises 3.0 to 8.0 mass% of Si, 0.1 to 0.5 mass% of Mg, 0.01 to 0.5 mass% of Cu, 0.1 to 0.5 mass% of Zr, 0.4 to 0.9 mass% of Fe, 0.01 to 0.5 mass% of Mn, 0.01 to 0.5 mass% of Cr, and 0.01 to 0.1 mass% of Ti, with the balance being Al and unavoidable impurities.
  • the inventor compared the effects of Zr, Mn, and Cr in detail, and found that Si particles contained in the metal structure (texture) are refined by adding a specific amount of Zr. Mn and Cr did not exhibit a significant Si particle refinement effect, but Zr exhibited a significant Si particle refinement effect.
  • the fatigue strength was improved by thus suppressing fatigue propagation.
  • the extruded material have an average Si particle size of 20 ⁇ m or less, and an average crystal grain size of 30 ⁇ m or less.
  • the content range of each component of the aluminum alloy is adjusted for the following reasons.
  • Si forms an Mg 2 Si precipitate with Mg, and provides the aluminum alloy with strength through age hardening.
  • the Si particles contained in the metal structure also provide the aluminum alloy with wear resistance.
  • the Mg content is set to 0.1 mass% or more taking account of these effects.
  • the Mg content is preferably set to 0.3 mass% or more when it is desired to provide the aluminum alloy with higher strength.
  • the Mg content is set to 0.5 mass% or less, and preferably 0.45 mass% or less.
  • the Si content is set to 8.0 mass% or less.
  • Cu improves the strength of the aluminum alloy while ensuring caulking properties. Since Cu is solid-dissolved to a certain extent, the strength and the machinability of the aluminum alloy are improved due to solid-solution hardening.
  • the Cu content is set to 0.01 mass% or more taking account of these effects. If the Cu content is too high, potential difference corrosion tends to occur. Therefore, the Cu content is set to 0.50 mass% or less. The Cu content is preferably set to 0.10 to 0.20 mass%.
  • the upper limit of the Cu content is more preferably set to 0.14 mass% or less.
  • the Fe content is preferably set to 0.40 mass% or more taking account of these effects. If the Fe content exceeds 0.9 mass%, a large number of Fe particles may precipitate at the crystal grain boundaries. In this case, the caulking properties of the aluminum alloy may deteriorate due to a decrease in toughness.
  • the Fe content is set to 0.4 to 0.9 mass%, and preferably 0.5 to 0.8 mass%.
  • Zr suppresses recrystallization, and refines the crystal grains. Moreover, fatigue propagation is suppressed due to refinement of the Si particles, so that the fatigue strength and the machinability of the aluminum alloy are improved.
  • the Zr content is set to 0.1 mass% or more in order to obtain these effects. If the Zr content exceeds 0.5 mass%, Zr may produce a primary crystal product, so that the caulking properties of the aluminum alloy may deteriorate.
  • the Zr content is set to 0.1 to 0.5 mass%.
  • the Zr content is set to 0.14 mass% or more when it is desired to further refine the Si particles.
  • the Zr content is set to 0.3 mass% or less from the viewpoint of caulking properties.
  • Mn has a small Si particle refinement effect. However, Mn suppresses recrystallization, and refines the crystal grains.
  • Mn contributes to an improvement in fatigue strength and machinability through refinement of the crystal grains.
  • the Mn content is set to 0.01 mass% or more in order to obtain these effects. If Mn precipitates at the crystal grain boundaries, potential difference corrosion and a decrease in caulking properties may occur. Therefore, the Mn content is set to 0.5 mass% or less.
  • the Mn content is preferably set to 0.05 to 0.15 mass%.
  • the Cr content is set to 0.01 mass% or more in order to obtain these effects. Since Cr may produce a primary crystal product, and may cause a decrease in caulking properties, the Cr content is set to 0.5 mass% or less.
  • the Cr content is preferably set to 0.05 to 0.15 mass%.
  • the wear-resistant aluminum alloy extruded material according to one embodiment of the invention exhibits caulking properties and machinability while maintaining wear resistance as a result of adjusting the content of Si, Mg, Fe, Cu, Mn, and Cr. Moreover, the Si particles can be refined by adjusting the Zr content, so that the fatigue strength of the aluminum alloy extruded material can be improved.
  • Zn shown in FIG. 1 is regarded as impurities. No problem occurs if the Zn content is 0.05 mass% or less.
  • the resulting extruded material was evaluated under the following conditions. The results are shown in FIG. 2 .
  • a JIS No. 1 (1-8) specimen (rotating bending fatigue test specimen) was prepared using the extruded material in accordance with JIS Z 2274. The specimen was subjected to a fatigue test using an Ono-type rotating bending fatigue tester conforming to the JIS standard. The fatigue strength of the specimen was calculated from the resulting S-N curve.
  • a JIS No. 13B tensile test specimen was prepared using the extruded material in accordance with JIS Z 2241. The specimen was subjected to a tensile test using a tensile tester conforming to the JIS standard to measure the tensile strength, the 0.2% proof stress, and the elongation at break of the specimen.
  • the surface hardness of the extruded material was measured using a Rockwell B scale hardness tester.
  • the caulking properties were measured using a cold upsetting test method.
  • a specimen (diameter: 14 mm, height: 21 mm) was sampled from the extruded material, and subjected to cold upsetting press in the axial direction to determine the critical upsetting ratio when microcracks started to occur in the side surface of the specimen.
  • the test was performed at room temperature and a compression rate of 10 mm/s using a tester "Autograph” (25 t) (manufactured by Shimadzu Corporation).
  • the cutting length (20 mm or less) shown in FIG. 2 refers to the maximum chip length.
  • the maximum chip length refers to the maximum length of chips produced under the following test conditions.
  • Chip test conditions cutting tool: step drill (4.2 ⁇ 6.8 (diameter)), rotational speed: 1200 rpm, feed: 0.05 mm/rev, processing amount: 15 mm, number of holes formed: 3, cutting oil: used
  • the wear resistance was measured using a frictional wear tester ("EFM-III-F” manufactured by Orientec Co., Ltd.).
  • the pin (diameter: 5 mm, height: 8 mm) was formed of an SCr20 (carburized quenched) material.
  • the specimen disk (diameter: 60 mm, height: 5 mm) was cut from the extruded material, and processed to have a surface roughness of 1.6 Z or less and a flatness of 0.01 or less.
  • a brake fluid was used as a lubricant.
  • the rotational speed was 160 rpm
  • the testing time was 50 hours
  • the applied load was 20 MPa.
  • the wear rate of the wear-out part of the specimen disk was measured using a roughness measuring instrument.
  • a specimen 35 (L) ⁇ 35 (W) ⁇ 35 (H) (see FIG. 6 ) was cut from the extruded material.
  • a dacrotized bolt was assembled to the center threaded portion of the specimen. The basic cycle shown in FIG. 6 was repeated ten times.
  • the corrosion resistance was evaluated by measuring the corrosion depth of the contact surface with the dacrotized bolt and an area around the contact surface.
  • a sample was cut from the center area of the extruded material, mirror-finished, etched, and then observed using an optical microscope (magnification: 400).
  • the measured value in the lengthwise direction was used as the crystal grain size or the Si particle size.
  • a sample was cut from the surface area of the extruded material, mirror-finished, etched, and then observed using an optical microscope (magnification: 50) to measure the surface recrystallization depth in an average area.
  • Each property target value shown in FIG. 2 indicates a value that is expected to be required to reduce the size and the weight of an automotive ABS body.
  • the target average Si particle size was not achieved in Comparative Example 6 in which Mn was added in an amount of 0.50 mass%, and Comparative Examples 5 and 6 in which Cr was added in an amount of 0.30 mass%.
  • Example 1 The extruded material obtained in Example 1 was compared with the extruded material obtained in Comparative Example 1.
  • FIG. 3 shows the measurement results for the S-N curve
  • FIG. 4 shows the measurement results for the average crystal grain size and the average Si particle size
  • FIG. 5 shows the measurement results for the surface recrystallization depth.
  • the extruded materials obtained in Comparative Example 7 had poor wear resistance due to low Si content and high Mg content.
  • the aluminum alloy extruded material according to the invention exhibits excellent wear resistance, caulking properties, machinability, and fatigue strength
  • the aluminum alloy extruded material may be used for automotive brake parts, hydraulic control parts of industrial machines, and the like.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP10794039.7A 2009-06-29 2010-06-23 Wear-resistant aluminum alloy extruded material having excellent fatigue strength and cutting properties Active EP2450462B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009154439 2009-06-29
PCT/JP2010/060644 WO2011001870A1 (ja) 2009-06-29 2010-06-23 疲労強度及び切削性に優れた耐摩耗性アルミニウム合金押出材

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EP2450462A1 EP2450462A1 (en) 2012-05-09
EP2450462A4 EP2450462A4 (en) 2016-07-27
EP2450462B1 true EP2450462B1 (en) 2017-03-22

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US (1) US20120045359A1 (ja)
EP (1) EP2450462B1 (ja)
JP (1) JP4755725B2 (ja)
CN (1) CN102459672A (ja)
WO (1) WO2011001870A1 (ja)

Cited By (1)

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CN110622243A (zh) * 2017-05-12 2019-12-27 株式会社Uacj 磁盘用铝合金基板及其制造方法、以及使用了该磁盘用铝合金基板的磁盘

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CN103849797A (zh) * 2014-01-16 2014-06-11 滁州东润电子科技有限公司 一种led灯具散热器铸造铝合金材料及其制备工艺
KR102156008B1 (ko) * 2014-07-31 2020-09-15 가부시키가이샤 고베 세이코쇼 절삭성이 우수한 알루미늄 합금 압출재 및 그의 제조 방법
WO2018017894A1 (en) 2016-07-21 2018-01-25 Johnson & Johnson Visioncare, Inc. Biomedical device including encapsulation
CN107022703A (zh) * 2017-04-27 2017-08-08 马鞍山常裕机械设备有限公司 一种汽车轮毂用高强度铝合金材料及其生产工艺
CN107245614B (zh) * 2017-07-27 2019-01-22 广州致远新材料科技有限公司 一种耐磨铝合金及其用途
CN109050870B (zh) * 2018-11-13 2019-02-22 烟台工程职业技术学院 一种快速拆装件及其加工方法
CN115700288A (zh) * 2022-10-26 2023-02-07 江苏艾速特低碳科技有限公司 一种汽车排气门铝基合金材料及其制备方法与应用

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CN110622243B (zh) * 2017-05-12 2021-08-10 株式会社Uacj 磁盘用铝合金基板及其制造方法、以及使用了该磁盘用铝合金基板的磁盘

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Publication number Publication date
EP2450462A4 (en) 2016-07-27
WO2011001870A1 (ja) 2011-01-06
US20120045359A1 (en) 2012-02-23
CN102459672A (zh) 2012-05-16
JP4755725B2 (ja) 2011-08-24
JPWO2011001870A1 (ja) 2012-12-13
EP2450462A1 (en) 2012-05-09

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