Microstructure of Ultra-High Strength Steel 300M Fabricated by Laser Melting Deposition Manufacturing

Acta Metall Sin

2008, Vol. 44

Issue (5): 598-602 DOI:

Research Articles

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Microstructure of Ultra-High Strength Steel 300M Fabricated by Laser Melting Deposition Manufacturing

H.M. Wang;

北京航空航天大学材料科学与工程学院

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H.M. Wang. Microstructure of Ultra-High Strength Steel 300M Fabricated by Laser Melting Deposition Manufacturing. Acta Metall Sin, 2008, 44(5): 598-602 .

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Abstract Thin plate of ultra-high strength steel 300M was fabricated by the laser melting deposition manufacturing process. Microstructure of the steel was analyzed by OM and SEM. The Rockwell hardness (HRC) profile was measured along depositing direction. Results showed that the as-deposited 300M steel plate had a rapidly solidified cellular dendrite structure. Solid-state phase transformation microstructure of the 300M steel varied notably with the increasing deposition height, with a tempered martensite and bainite mixed structure in the bottom part, a mixture of carbide-free bainite and island-like matensite-austenite duplex structure in the middle-lower part and a mixed martensite-bainite structure in the middle-upper part. The hardness profile varied as stepwise with the increasing deposition height. The step-like hardness profile and the variable post-deposition transformation microstructures along the depositing direction were caused by the particular cyclic thermal behavior of the laser melting deposition manufacturing process.

Key words: laser melting deposition manufacturing ultra-high strength steel microstructure

Received: 15 August 2007

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