Microstructure and properties of ultra-high strength steel joints welded with high nitrogen austenite wire

YANG Dongqing; XIONG Hanying; HUANG Yong; PENG Yong; WANG Kehong

doi:10.12073/j.hjxb.20200830001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(12): 44-48. > DOI: 10.12073/j.hjxb.20200830001

YANG Dongqing, XIONG Hanying, HUANG Yong, PENG Yong, WANG Kehong. Microstructure and properties of ultra-high strength steel joints welded with high nitrogen austenite wire[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(12): 44-48. DOI: 10.12073/j.hjxb.20200830001

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Microstructure and properties of ultra-high strength steel joints welded with high nitrogen austenite wire

Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology, Ministry of Industry and Information Technology, Nanjing, 210094, China

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Received Date: August 29, 2020
Available Online: January 06, 2021

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Abstract

Abstract

In order to solve the problem of cold cracks in ultra-high-strength steel welding, the GMAW process experiment was carried out with high-nitrogen austenitic wire with lower strength than the base metal to study the microstructure and properties of ultra-high-strength steel welded joints at different grooved angles. The results show that welded joints are well formed without cracks according to cross-section of weld, the microstructure near the fusion line is mainly acicular and lath martensite, and the weld structure is mainly austenite and ferrite dendrites surrounded by austenite matrix; the average hardness of the martensite zone near the fusion line is 530 HV; the average hardness of the weld zone is 275 HV; compared to 60° grooved joints, the hardness of the martensite structure near the fusion line of 90° grooved joints are higher; The average tensile strength reaches 850 MPa, and the highest is 887 MPa, while the average tensile strength of 60° groove joints is only 690 MPa.
- ultra-high strength steel,
- high nitrogen austenitic wire,
- microstructure,
- mechanical properties

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Microstructure and properties of ultra-high strength steel joints welded with high nitrogen austenite wire