Session B: Advanced Steels, High Temperature Metallic Materials and Ceramic MaterialsNo Access

THE Z-PHASE IN 9Cr FERRITIC/MARTENSITIC HEAT RESISTANT STEEL

FENGSHI YIN

School of Mechanical Engineering, Shandong University of Technology, Zibo, China

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FUXIA CHEN

School of Mechanical Engineering, Shandong University of Technology, Zibo, China

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XUEBO JIANG

School of Mechanical Engineering, Shandong University of Technology, Zibo, China

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BING XUE

School of Mechanical Engineering, Shandong University of Technology, Zibo, China

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LI ZHOU

School of Chemical Engineering, Shandong University of Technology, Zibo, China

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, and

WOOSANG JUNG

Division of Materials Science and Technology, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea

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https://doi.org/10.1142/S0217979209060579Cited by:1 (Source: Crossref)

Abstract

The precipitation behavior of Z-phase was investigated during long-term aging at 650°C in an ultra low carbon 9Cr ferritic/martensitic heat resistant steel. The steel was prepared by vacuum induction melting followed by hot forging and rolling into a plate. The plate was normalized at 1100°C for 1h, cooled in air and tempered at 700°C for 1h. Bimodal nano-sized MX precipitates distribute densely and homogeneously in the matrix within martensitic lath after normalizing-and-tempering heat treatment. After aging at 650°C for 1200h, the Z-phase was found to nucleate on the larger nano-sized MX. The Z-phase and MX have the following orientation relationship: <112>_Z-phase//<001>_MX and .

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