Effects of Graded Pressure Difference on the Microstructure and Microhardness of Vacuum Differential Pressure Casting ZL114A Alloy

Huang Puying; Lu Gang; Yan Qingsong; Xu Pian; Huang Pengpeng; Liu Dong

doi:10.15980/j.tzzz.2021.04.022

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Effects of Graded Pressure Difference on the Microstructure and Microhardness of Vacuum Differential Pressure Casting ZL114A Alloy
Vol. 41, Issue 4, Pages: 494-497(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.04.022

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[1]黄普英,芦刚,严青松,徐翩,黄朋朋,刘栋.分级加压压差对真空差压铸造ZL114A合金微观组织及显微硬度的影响[J].特种铸造及有色合金,2021,41(04):494-497.

Huang Puying, Lu Gang, Yan Qingsong, et al. Effects of Graded Pressure Difference on the Microstructure and Microhardness of Vacuum Differential Pressure Casting ZL114A Alloy. [J]. Special Casting & Nonferrous Alloys 41(4):494-497(2021)
[1]黄普英,芦刚,严青松,徐翩,黄朋朋,刘栋.分级加压压差对真空差压铸造ZL114A合金微观组织及显微硬度的影响[J].特种铸造及有色合金,2021,41(04):494-497. DOI： 10.15980/j.tzzz.2021.04.022.

Huang Puying, Lu Gang, Yan Qingsong, et al. Effects of Graded Pressure Difference on the Microstructure and Microhardness of Vacuum Differential Pressure Casting ZL114A Alloy. [J]. Special Casting & Nonferrous Alloys 41(4):494-497(2021) DOI： 10.15980/j.tzzz.2021.04.022.

摘要

采用真空差压铸造法制备ZL114A合金试样

借助金相显微镜、扫描电镜及显微硬度计研究了分级加压压差对真空差压铸造ZL114A合金微观组织及显微硬度的影响。结果表明

分级加压压差显著影响ZL114A合金的显微组织和性能。在分级加压压差为35～185kPa的范围内

随着分级加压压差增加

金属液的挤渗能力逐渐增强

ZL114A合金的初生相形貌由粗大的树状晶向细小的蔷薇晶与等轴晶转变

组织明显细化

共晶Si也由粗大的棒状或针片状向细小的棒状或圆粒状转变;同时合金的显微硬度显著提高

当分级加压压差为185kPa时

其显微硬度（HV）为96.9

相比在压差为35kPa的条件下提高了33.4%。

Abstract

The ZL114A alloy samples were prepared using vacuum differential pressure casting method.With the help of metallographic microscope

scanning electron microscope and microhardness tester

the effects of graded pressure difference on the microstructure and micro-hardness of vacuum differential pressure casting ZL114A alloy were investigated.The results show that the graded pressure difference significantly affects the microstructure and properties of ZL114A alloy.Within the range of the graded pressure difference of 35 kPa～185 kPa

with the increase of the graded pressure difference

the squeezing ability of molten metal is also enhanced.The primary phase in ZL114A alloy is changed from coarse dendritic crystals to fine resette crystals and equiaxed crystals.The microstructure is obviously refined

and the eutectic silicon phase is changed from coarse rods or needles to fine rods or round grains.Meanwhile

the microhardness of ZL114A alloy has been significantly improved.When the graded pressure difference is 185 kPa

the microhardness reaches 96.9 HV

which is 33.4% higher than that of ones with the pressure difference of 35 kPa.