Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第7期
论文作者：Yi-li Dai Sheng-fu Yu An-guo Huang Yu-sheng Shi
文章页码：933 - 942
摘 要：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） and1100°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 to20 μm. The mechanical properties of HBMDPJ satisfies the requirement for the intended application.
Yi-li Dai，Sheng-fu Yu，An-guo Huang，Yu-sheng Shi
State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology
摘 要：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） and1100°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 to20 μm. The mechanical properties of HBMDPJ satisfies the requirement for the intended application.
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