Cracking analysis of ZL111 aluminum alloy hydraulic brake master cylinder

doi:10.13251/j.issn.0254-6051.2021.04.044

Abstract

Abstract: ZL111 aluminum alloy hydraulic brake master cylinder was found cracking during the appearance inspection, and seal inspection revealed its leakage. In order to find out the reasons for the cracking of the cylinder, the cracks, fracture morphology and microstructure of the cylinder were observed, and its chemical composition and phase transition point were detected. The results show that the failure of the cylinder is due to the presence of over burning defects in the structure, which reduces the strength of the material. The rounded and brittle eutectic silicon phase is distributed in the grain boundary, which aggregates and grows, and further weakens the grain boundary. Under the effect of quenching stress, the cylinder cracks, and the cracks expand to macroscopic cracks during the subsequent processing. It is discussed and analyzed that the root cause of the cracking of the cylinder is the high content of Mg element in the composition, which reduces the temperature that limits to cause over burning.

Key words: ZL111 aluminum alloy, quenching stress, over burning, crack, Mg element

CLC Number:

TG146.2

Wu Bingbing, Zeng Zhiwei, Wang Junzhao, Deng Fanlin, Jiao Guangsheng. Cracking analysis of ZL111 aluminum alloy hydraulic brake master cylinder[J]. Heat Treatment of Metals, 2021, 46(4): 232-235.

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