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Open Access Microstructure and Mechanical Properties of 9Cr Martensitic Heat-resistant Steel Fabricated by Wire and Arc Additive Manufacture Technology

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Wire and arc additive manufacture (WAAM) technology, a promising technology for the fabrication of complex and larger size martensitic heat-resistant steel components, was applied to fabricate 9Cr martensitic heatresistant steel, which is widely used in the nuclear and thermal power industries due to high-temperature creep strength, high thermal conductivity and excellent corrosion resistance. The microstructure and mechanical properties of as-welded and heat treated martensitic heat-resistant steel have been investigated. The experimental results showed that in the as-welded condition, the microstructure mainly consisted of untempered columnar lath martensitic microstructure. It was observed that heat treatment provided the more homogeneous microstructure with the characteristics of tempered martensite and precipitates compared to as-welded condition. After heat treatment, the average hardness of the sample at different measuring locations was decreased by 29.3%, 27.1%, 27.3% and 30%, respectively. In addition, the measured hardness at four different locations also indicated a lower hardness gradient after heat treatment than in the as-welded condition. The toughness was observed to have improved significantly, and the impact fracture morphology showed ductile fracture after heat treatment.

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Keywords: 9CR MARTENSITIC HEAT-RESISTANT STEEL; CHARPY TOUGHNESS; HARDNESS; MICROSTRUCTURE; WIRE AND ARC ADDITIVE MANUFACTURE

Document Type: Miscellaneous

Publication date: April 1, 2019

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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