TRANSFORMATION INDUCED SUPERPLASTICITY IN 18Ni MARAGING STEEL

Acta Metall Sin

1992, Vol. 28

Issue (2): 9-13 DOI:

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TRANSFORMATION INDUCED SUPERPLASTICITY IN 18Ni MARAGING STEEL

YIN Zhongda;ZHOU Yongkang Harbin Institute of Technology; Shanghai Centrifugal Machinery Research Institute

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YIN Zhongda;ZHOU Yongkang Harbin Institute of Technology; Shanghai Centrifugal Machinery Research Institute. TRANSFORMATION INDUCED SUPERPLASTICITY IN 18Ni MARAGING STEEL. Acta Metall Sin, 1992, 28(2): 9-13.

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Abstract After exploring the influence of stress, cold--rolling reduction and copling rateon transformation induced strain, the transformation induced superplasticity forming techniqueof the 18Ni maraging steel (2450MPa) was developed. Through 14 times γ?α' cyclic transfor-mation, the limited elongation of 320% can be obtained in 60% cold--rolled specimen. TEM ob-servation revealed that the morphology of stress induced martensite is massive.

Key words: maraging steel transformation induced superplasticity cold-rolling

Received: 18 February 1992

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