Hydrogen Content of Low-pressure Casting A356 Aluminum Alloy Melt and Its Influence on Pinholes in Castings

Zhang Huarui; Ma Hanyu; Du Ming; Duan Hui; Hong Tao; Jin Yu; Zhang Hu; Cheng Ying

doi:10.15980/j.tzzz.2022.11.001

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Hydrogen Content of Low-pressure Casting A356 Aluminum Alloy Melt and Its Influence on Pinholes in Castings
Vol. 42, Issue 11, Pages: 1321-1325(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.11.001

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Zhang Huarui, Ma Hanyu, Du Ming, et al. Hydrogen Content of Low-pressure Casting A356 Aluminum Alloy Melt and Its Influence on Pinholes in Castings. [J]. Special Casting & Nonferrous Alloys 42(11):1321-1325(2022)
DOI：

Zhang Huarui, Ma Hanyu, Du Ming, et al. Hydrogen Content of Low-pressure Casting A356 Aluminum Alloy Melt and Its Influence on Pinholes in Castings. [J]. Special Casting & Nonferrous Alloys 42(11):1321-1325(2022) DOI： 10.15980/j.tzzz.2022.11.001.

摘要

分析了A356铝合金熔体在静置、转运以及铸造环节中的氢含量变化，探究了空气绝对含水量、压缩空气露点温度、Sr含量等因素对铝熔体吸氢的影响，分析了不同熔体氢含量下的铸件针孔缺陷。结果表明，转运环节是吸氢相对严重的环节，空气绝对含水量和Sr含量是影响熔体吸氢的主要因素。在不同氢含量条件下，铸件中同时包含点状针孔和在枝晶间分布的网状针孔，孔隙率随熔体氢含量的升高而增加。在保证变质效果的前提下，降低Sr添加量有利于降低熔体氢含量，减少铸件中针孔的产生。

Abstract

The variation of hydrogen content in A356 aluminum alloy melt during holding

transferring and casting process was investigated. The influence of absolute water content of air

dew point temperature of compressed air

Sr content on the hydrogen absorption of aluminum melt was explored

and the pinhole defects under different hydrogen content condition were analyzed. The results indicate that transferring process leads to relatively serious hydrogen absorption

where absolute water content of air and Sr content are the main factors influencing the hydrogen absorption of aluminum melt. Under different hydrogen content conditions

the castings simultaneously contain dot pinholes and reticular pinholes distributed between dendrites

and the porosity is increased with the increase of hydrogen content in the melt. Under the premise of guaranteeing the modification effect

the decrease of the Sr addition is helpful to decline hydrogen content in the melt and reduce pinholes in the castings.