Microstructure and Properties of ER50-6 Steel Fabricated by Wire Arc Additive Manufacturing.

Qingxian Hu,Chengtao Li,Xiaoli Wang,Kewei Fang,Junyan Miao,Guosong Wu

doi:10.1155/2021/7846116

Qingxian Hu, Chengtao Li + Show 4 more

Open Access

https://doi.org/10.1155/2021/7846116

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Abstract

In this paper, ER50-6 steel was fabricated by wire arc additive manufacturing (WAAM) with an A-W GTAW system. The microstructure, mechanical properties, and corrosion behaviors of ER50-6 steel by WAAM were studied. The results showed that, with the GMAW current increased, from the bottom to the top of the sample, the microstructure was fine ferrite and granular pearlite, ferrite equiaxed grains with fine grains at grain boundaries, and columnar ferrite, respectively. The average hardness in the vertical direction of samples 1# and 2# was 146 and 153 HV, respectively. The hardness of sample 2# increased because of the refinement of grain. The pores in the sample increased as the bypass current increased. The higher bypass current also has a deterioration effect on the corrosion behavior of ER50-6 steel.

Highlights

Wire arc additive manufacturing (WAAM) becomes the core of the new industrial era
Colegrove et al [10] combined high-pressure rolling with WAAM and reported that peak residual stress was reduced and refined microstructure was obtained
How to maintain a high deposition rate, avoid excessive heat input, and maintain arc stability has become an urgent problem in the process of wire arc additive manufacturing

Summary

Introduction

Wire arc additive manufacturing (WAAM) becomes the core of the new industrial era It has many advantages such as high deposition rate [1], low equipment cost, high material utilization, and environmental friendliness. It is a versatile and cost-effective method to fabricate complex parts and largesized components [2] It included three types of processes, namely, gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), and plasma welding (PAW). In these processes, the arc is used as the heat source, and the wire is used as additive manufacturing materials. Gas. Scanning tungsten arc welding (GTAW) has low heat input, and it is stable and easy to operate. This study will provide the research foundation for the wire arc additive manufacturing of the large components

Experimental Details

Results and Discussion

Mechanical Test

Conclusions