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| THE FORMATION OF CHI PHASE IN A Mo-BEARING STAINLESS STEEL |
| CHUANG YU-CHIH;LIU CHIA-LO;CHANG CHING-CHUNG Institute of Metal Research Academia Sinica |
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Cite this article:
CHUANG YU-CHIH;LIU CHIA-LO;CHANG CHING-CHUNG Institute of Metal Research Academia Sinica. THE FORMATION OF CHI PHASE IN A Mo-BEARING STAINLESS STEEL. Acta Metall Sin, 1957, 2(1): 89-105.
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Abstract The decompsition of δ-ferrite in the temperature range 550°—1000℃ inquenched 17/5/6 Cr-Ni-Mo Stainless steel specimens has been studied by meansof microscopic and X-ray diffraction method. It is shown that the nature of thedecomposition product of δ-ferrite varies with the reheating temperature, Chi andaustenite appeared in the temperature range 700—1000℃, Whereas below 700℃Fe_3Mo_3C and (Cr, Fe, Mo)_23C_6 were formed from δ-ferrite instead of Chi. The morphology and mechanism of Chi formation are also dependent on thereheating temperature. Above 900℃, δ-ferrite was found to decompose into Chiand austenite as eutectoid, the leading phase being probably Chi. Between 700℃and 900℃, it is likely that the nucleation of austenite couldnot keep pace withthat of Chi, thus Chi was found to precipitate first and the remaining δ-ferritethen transformed to austenite. Below 700℃ the precipitation of carbides in δ-ferrite was accompanied bymartensite formation in the austenitic matrix. This may be caused by the diffu-sion of carbon from the austenitic matrix to δ-ferrite to supply the carbon re-quired for the carbide precipitation.
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Received: 18 January 1957
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