Effects of Melt Treatment on the Casting Defects and Mechanical Properties of Metal Mould Casting Al-10Si Alloy Steering Pump

Shen Gang1; Xu Zhifeng1

doi:10.15980/j.tzzz.2013.02.026

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Effects of Melt Treatment on the Casting Defects and Mechanical Properties of Metal Mould Casting Al-10Si Alloy Steering Pump
Vol. 33, Issue 2, Pages: 112-115(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.02.026

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[1]沈刚,徐志锋.熔体处理对金属型铸造Al-10Si合金转向泵性能的影响[J].特种铸造及有色合金,2013,33(02):112-115.

Shen Gang1, Xu Zhifeng1. Effects of Melt Treatment on the Casting Defects and Mechanical Properties of Metal Mould Casting Al-10Si Alloy Steering Pump. [J]. Special Casting & Nonferrous Alloys 33(2):112-115(2013)
[1]沈刚,徐志锋.熔体处理对金属型铸造Al-10Si合金转向泵性能的影响[J].特种铸造及有色合金,2013,33(02):112-115. DOI： 10.15980/j.tzzz.2013.02.026.

Shen Gang1, Xu Zhifeng1. Effects of Melt Treatment on the Casting Defects and Mechanical Properties of Metal Mould Casting Al-10Si Alloy Steering Pump. [J]. Special Casting & Nonferrous Alloys 33(2):112-115(2013) DOI： 10.15980/j.tzzz.2013.02.026.

摘要

针对228型汽车转向泵Al-10Si铸件金属型铸造存在的渣孔、缩松及针孔等缺陷

研究了合金熔体处理工艺对转向泵铸件金属型铸造缺陷和力学性能的影响。试验表明

Al-Ti-C+Al-Sr复合变质比Al-Ti-B+Al-Sr复合变质有更好的晶粒细化效果

使铸件的抗拉强度提高了10%

伸长率提高了40%～50%;在Al-10Si合金熔体的精炼净化处理方面

旋转精炼气泡浮游法比熔剂法有更强的除渣、除气能力。旋转气泡浮游法在转速为400r/min、气体流量为5L/min、旋转精炼15min、静置9min后

夹渣废品率从原来的36.2%降至1.2%以下

铸件合格率提高至97%。

Abstract

Aiming at the slag inclusion

shrinkage hole and pinhole defects in 228automobile steering pumps during metal mould casting process

the effects of melt treatment on casting defects and mechanical properties of 228automobile steering pumps were investigated.The results show that the modification effects of Al-Ti-C+Al-Sr compound modifier are obviously superior to those of Al-Ti-B+ Al-Sr compound modifier in refining grain size

and tensile strength and elongation of the steering pump with Al-Ti-C+Al-Sr compound modifier are improved by 10%and approximately 40%～50%

respectively.Compared with the flux method

the rotating bubble floating method exhibits the more acceptable ability to slag removal and degassing.With rotating velocity of 400r/min

gas flow of 5L/min and rotating refining for 15min as well as holding for 9min

the reject rate is decreased from 36.2%to below 1.2%

and the qualified rate is increased by 97%.