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| EFFECT OF AUSTENITE ORDERING ON MARTENSITIC TRANSFORMATION IN Fe-Ni ALLOYS |
| YAN Linfa (Shanghai Iron and Steel Research Institute); XU Zuyao (Shanghai Jiaotong University) |
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Cite this article:
YAN Linfa (Shanghai Iron and Steel Research Institute); XU Zuyao (Shanghai Jiaotong University). EFFECT OF AUSTENITE ORDERING ON MARTENSITIC TRANSFORMATION IN Fe-Ni ALLOYS. Acta Metall Sin, 1986, 22(5): 29-36.
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Abstract Experimental results show that, in Fe-Ni alloys, the M_s or M_b values decrease in two steps with the decrease in quenching temperature below 950℃ with definite grain size of the parent phase. In the first step, i. e., quenching temperature around 800℃, a minimum M_s value appears, and in the second one, i.e., below 700℃ quenching, M_s decreases continueously. The burst aize of martensite transformation corresponding to the lower quenching temperatures is rather smaller than that to the higher ones. These phenomena prove to be related to the ordering of the parent phase. The observation of densely dispersed tine precipitates and superlattice dislocations by TEM comfirms the views that ordering does exist in bulk specimens and markedly affect the martensitic transformation of Fe-Ni alloys.
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Received: 18 May 1986
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