Effects of Annealing and Cryogenic Treatment on Microstructure and Properties of ZL114A Alloy Formed by SLM Technology

Geng Nannan; Xu Zhifeng; Liang Xiang

doi:10.15980/j.tzzz.2021.02.013

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Effects of Annealing and Cryogenic Treatment on Microstructure and Properties of ZL114A Alloy Formed by SLM Technology
Vol. 41, Issue 2, Pages: 189-194(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.02.013

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[1]耿楠楠,徐志锋,梁祥.退火及深冷处理对SLM成形ZL114A合金组织及性能的影响[J].特种铸造及有色合金,2021,41(02):189-194.

Geng Nannan, Xu Zhifeng, Liang Xiang. Effects of Annealing and Cryogenic Treatment on Microstructure and Properties of ZL114A Alloy Formed by SLM Technology. [J]. Special Casting & Nonferrous Alloys 41(2):189-194(2021)
[1]耿楠楠,徐志锋,梁祥.退火及深冷处理对SLM成形ZL114A合金组织及性能的影响[J].特种铸造及有色合金,2021,41(02):189-194. DOI： 10.15980/j.tzzz.2021.02.013.

Geng Nannan, Xu Zhifeng, Liang Xiang. Effects of Annealing and Cryogenic Treatment on Microstructure and Properties of ZL114A Alloy Formed by SLM Technology. [J]. Special Casting & Nonferrous Alloys 41(2):189-194(2021) DOI： 10.15980/j.tzzz.2021.02.013.

摘要

以选区激光烧结（SLM）成形ZL114A合金为研究对象

进行了SLM成形ZL114A合金的退火和深冷处理工艺试验

主要研究了退火温度和深冷保温时间对SLM成形ZL114A合金微观组织和力学性能的影响。结果表明

230℃×2h退火处理后

SLM成形ZL114A合金的伸长率提高了18.0%

抗拉强度下降了2.9%;300℃×2h退火处理导致合金的抗拉强度和伸长率下降了28.2%和22.3%;合金退火态的微观组织表现为α-Al与Si相交界处存在大量的孔洞。而深冷处理（-196℃）对SLM成形ZL114A合金的力学性能有明显改善

其中深冷保温36h对力学性能提升效果最佳

相较沉积态

其抗拉强度提高了18.9%

伸长率提高了23.0%;其深冷态的共晶Si在基体中分散更均匀

并转为棒状结构

使合金的塑性得到明显提高。

Abstract

The effects of annealing temperature and cryogenic holding time on the microstructure and mechanical properties of SLM-formed ZL114 Aalloy were investigated by OM

SEM

EDS and tensile testing.The results demonstrate that after 230℃×2 hannealing treatment

the elongation of the alloy is increased by 18.04%

while the tensile strength is decreased by 2.94%

and annealing treatment at 300 ℃ ×2 hresults in a decrease of28.19%in tensile strength and 4.55%in elongation of the alloy.The annealed microstructure of the alloy presents a large number of pores at the junction ofα-Al and Si phase.Cryogenic treatment（-196℃）can significantly improve the mechanical properties of SLM-formed ZL114 Aalloy

where the holding time of 36 hhas the best effect.Compared with the those of deposited state ones

its tensile strength and elongation are increased by 18.99%and23.03%

respectively.The cryogenic eutectic Si is more evenly dispersed in the matrix and transformed into a rodlike structure

which significantly enhances the plasticity of the alloy.