Failure Analysis of Nozzle Body for Zinc-alloy Die Casting and Measures of Improving its Service Life

Zhang Tiejun1; Wang Mingguang1; Li Peijie2; Xu Niansheng3; Liu Nengyuan3

doi:10.15980/j.tzzz.2012.07.030

Views : 0 下载量: 118 CSCD: 1

Export
Share
Collection
Album

Failure Analysis of Nozzle Body for Zinc-alloy Die Casting and Measures of Improving its Service Life
Vol. 32, Issue 7, Pages: 627-629(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.07.030

扫描看全文

[1]张铁军,王明光,李培杰,徐年生,刘能元.锌合金压铸射嘴身失效分析与提高其使用寿命的研究[J].特种铸造及有色合金,2012,32(07):627-629.

Zhang Tiejun1, Wang Mingguang1, Li Peijie2, et al. Failure Analysis of Nozzle Body for Zinc-alloy Die Casting and Measures of Improving its Service Life. [J]. Special Casting & Nonferrous Alloys 32(7):627-629(2012)
[1]张铁军,王明光,李培杰,徐年生,刘能元.锌合金压铸射嘴身失效分析与提高其使用寿命的研究[J].特种铸造及有色合金,2012,32(07):627-629. DOI： 10.15980/j.tzzz.2012.07.030.

Zhang Tiejun1, Wang Mingguang1, Li Peijie2, et al. Failure Analysis of Nozzle Body for Zinc-alloy Die Casting and Measures of Improving its Service Life. [J]. Special Casting & Nonferrous Alloys 32(7):627-629(2012) DOI： 10.15980/j.tzzz.2012.07.030.

摘要

根据射嘴身的工况

通过理论分析和损伤零件的破坏分析

确定了锌合金压铸射嘴身的失效机制

是锌合金熔体表面张力小、渗透性强、腐蚀性强、熔体腐蚀和应力腐蚀共同作用的结果。锌合金熔体能溶解钢材中的Fe、C、Si等元素

与Fe形成FeZn13相

同时C、Si、P、S等元素的存在

促进了Fe在锌合金熔体中的溶解

而形成锌合金压铸时特有射嘴身高温腐蚀问题。据此

提出了对射嘴身工作面进行稀土-B共渗

来阻止腐蚀发生和延长射嘴身的使用寿命;在稀土加入量为4%

加热温度为950℃

保温时间为7h

可获得60～70μm的渗B层。实际应用结果表明

经渗B的射嘴身使用寿命比未经处理的提高了4倍。

Abstract

Aiming at the working conditions of nozzle body

through theory analysis and failure analysis of the injury parts

the failure of nozzle body for Zn alloy die casting is attributed to small surface tension

high permeability and corrosion of zinc alloy melt as well as co-action of melt corrosion with stress corrosion.FeZn13 phase can be formed in the zinc alloy melt due to dissolution of Fe

C and Si from the tool steel.Meanwhile

dissolution of Fe in the Zn alloy melt can be promoted due to the existence of C

P and S element

resulting in the high temperature corrosion of nozzle body during die casting Zn alloy process.Through co-infiltration treatment of RE-B on working face of nozzle body

the corrosion of nozzle body can be restrained

and its service life can be increased.The B-infiltrated layer with 60～70 μm in thickness can be formed with 4% RE addition at 950 ℃ for 7 h.The practical application shows that the service life of the nozzle body with B-infiltrated treated is 4 times higher than that without treated ones.