Anisotropy in Microstructures and Mechanical Properties of 2Cr13 Alloy Produced by Wire Arc Additive Manufacturing
Received date: 2022-08-25
Revised date: 2022-10-17
Online published: 2022-10-20
Supported by
China Postdoctoral Science Foundation(2021M693230);Natural Science Foundation of Guangxi Province(2021JJB160022)
2Cr13 martensite stainless steel has been widely used for the manufacturing of surgical tools and turbine blades. Contrary to the conventional fabrication technologies, there are several remarkable advantages in the fabrication of 2Cr13 parts by adopting wire arc additive manufacturing (WAAM) technologies, such as excellent metallurgical bonding, high production efficiency, near-net-shape production, and limited environmental contamination. In this work, the effect of interlayer dwelling temperature (110-550oC) on microstructural and mechanical properties has been revealed, providing a new approach for the active control of the performances of 2Cr13 buildups produced by wire-arc additive manufacturing. The part with a dwelling temperature of 550oC was featured by elongated acicular martensite features, with a slightly enhanced fiber-like texture, along with minor fine irregular-reverse austenite structures, dispersed among martensite gaps. This special martensitic distribution was mainly caused by the grain-broken effect under the intensive thermal shock from liquid melting pool. Consequently, the enhanced tensile strength and microhardness were obtained due to grain refinement, although exhibiting an obvious anisotropy in tensile properties. The parts with dwelling temperatures of 110-180oC were characterized by relatively coarsened martensite laths, with a random texture type, within block-shaped ferrite matrix. The average martensite size was gradually refined due to the increased cooling rate by lowering interlayer temperature. The isotropic mechanical properties of all three parts (110-180oC) were similar because of the similar martensite laths.
Jinguo GE , Zhao LU , Siliang HE , Yan SUN , Shuo YIN . Anisotropy in Microstructures and Mechanical Properties of 2Cr13 Alloy Produced by Wire Arc Additive Manufacturing[J]. Acta Metall Sin, 2023 , 59(1) : 157 -168 . DOI: 10.11900/0412.1961.2022.00414
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