Fatigue Properties of Cast Aluminum Alloy AlSi9Cu3

Dai Haojie; Zhao Lihui; Weng Shuo

doi:10.15980/j.tzzz.2019.11.024

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Fatigue Properties of Cast Aluminum Alloy AlSi9Cu3
Vol. 39, Issue 11, Pages: 1245-1248(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.11.024

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[1]戴浩杰,赵礼辉,翁硕.铸造AlSi9Cu3合金疲劳性能[J].特种铸造及有色合金,2019,39(11):1245-1248.

Dai Haojie, Zhao Lihui, Weng Shuo. Fatigue Properties of Cast Aluminum Alloy AlSi9Cu3. [J]. Special Casting & Nonferrous Alloys 39(11):1245-1248(2019)
[1]戴浩杰,赵礼辉,翁硕.铸造AlSi9Cu3合金疲劳性能[J].特种铸造及有色合金,2019,39(11):1245-1248. DOI： 10.15980/j.tzzz.2019.11.024.

Dai Haojie, Zhao Lihui, Weng Shuo. Fatigue Properties of Cast Aluminum Alloy AlSi9Cu3. [J]. Special Casting & Nonferrous Alloys 39(11):1245-1248(2019) DOI： 10.15980/j.tzzz.2019.11.024.

摘要

对某汽车转向器AlSi9Cu3铝合金管柱进行了高周疲劳性能分析

使用"成组法"测试材料的高周疲劳性能

绘制了该材料的疲劳寿命应力曲线（P-S-N）

估算出该材料在99%可靠度下循环106次时的疲劳强度为120.7 MPa。使用扫描电镜对试样的疲劳断口进行观察

发现疲劳源大多为孔洞和氧化夹杂物。原始铸造缺陷的类型和尺寸导致试样疲劳寿命缩短和分散度增加。

Abstract

High-cycle fatigue performance analysis was carried out on a cast aluminum alloy AlSi9Cu3 steering column tube.Using the group method

the high cycle fatigue performance of the material was measured and the P-SN curve of the material was plotted.It is estimated that the fatigue strength of the material at a fatigue life of 106 times at 99% reliability reaches 120.7 MPa.Scanning electron microscopy（SEM）was used to observe the fatigue fracture of the specimens.The results reveal that fatigue source is composed of mostly pores and oxide inclusions.The type and size of the original defect can decrease the service life and increase the dispersity of fatigue life.