Yi-li Dai, Sheng-fu Yu, An-guo Huang, and Yu-sheng Shi, Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing, Int. J. Miner. Metall. Mater., 27(2020), No. 7, pp. 933-942. https://doi.org/10.1007/s12613-019-1919-1
Cite this article as:
Yi-li Dai, Sheng-fu Yu, An-guo Huang, and Yu-sheng Shi, Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing, Int. J. Miner. Metall. Mater., 27(2020), No. 7, pp. 933-942. https://doi.org/10.1007/s12613-019-1919-1
Research Article

Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing

+ Author Affiliations
  • Corresponding author:

    Yu-sheng Shi    E-mail: yushengfu@hust.edu.cn

  • Received: 22 July 2019Revised: 26 September 2019Accepted: 27 September 2019Available online: 28 October 2019
  • A high-building multi-directional pipe joint (HBMDPJ) was fabricated by wire and arc additive manufacturing using high-strength low-alloy (HSLA) steel. The microstructure characteristics and transformation were observed and analyzed. The results show that the forming part includes four regions. The solidification zone solidifies as typical columnar crystals from a molten pool. The complete austenitizing zone forms from the solidification zone heated to a temperature greater than 1100°C, and the typical columnar crystals in this zone are difficult to observe. The partial austenitizing zone forms from the completely austenite zone heated between Ac1 (austenite transition temperature) and 1100°C, which is mainly equiaxed grains. After several thermal cycles, the partial austenitizing zone transforms to the tempering zone, which consistes of fully equiaxed grains. From the solidification zone to the tempering zone, the average grain size decreases from 75 to 20 μm. The mechanical properties of HBMDPJ satisfies the requirement for the intended application.

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