Effect of arc power on microstructure and mechanical properties of austenitic stainless steel 316L fabricated by high efficient arc additive manufacturing

CHEN Xiaohui; ZHANG Shuquan; RAN Xianzhe; HUANG Zheng

doi:10.12073/j.hjxb.20190818001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(5): 42-49. > DOI: 10.12073/j.hjxb.20190818001

CHEN Xiaohui, ZHANG Shuquan, RAN Xianzhe, HUANG Zheng. Effect of arc power on microstructure and mechanical properties of austenitic stainless steel 316L fabricated by high efficient arc additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(5): 42-49. DOI: 10.12073/j.hjxb.20190818001

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Effect of arc power on microstructure and mechanical properties of austenitic stainless steel 316L fabricated by high efficient arc additive manufacturing

1.
National Engineering Laboratory of Additive Manufacturing for Large Metallic, Components and Engineering Research Center, Beihang University, Beijing, 100191, China
2.
AECC Shanghai Commercial Aircraft Engine Manufacturing Co., Ltd., Shanghai, 201306, China

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Received Date: August 17, 2019
Available Online: September 26, 2020

Graphical Abstract

Abstract

Abstract

The austenitic stainless steel 316L was fabricated by high power MIG arc additive manufacturing and its microstructure evolution, mechanical properties and fracture behavior were investigated. Results show that there are columnar grains forming in the MIG arc additive manufacturing 316L. The microstructure consists of vermicular δ and σ phases within γ matrix. The δ distributed both at grain boundaries and in the grains can strengthen the steel. With the arc power increasing from 3 763 W to 8 400 W, δ phases decrease and σ phases increase, as well as grain size increases. That leads to the ultimate tensile strength decrease from 578 MPa to 533 MPa, yield strength decrease from 310 MPa to 235 MPa, elongation decrease from 53% to 44%, reduction of area decrease from 67% to 60%. A pronounced feature is that the fracture type transfers from trans-granular dimple fracture to inter-granular dimpled fracture at the arc power of 8 400 W.
- additive manufacturing,
- 316L austenitic stainless steel,
- microstructure,
- mechanical properties

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References (15)

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