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| MIDDLE TEMPERATURE TRANSFORMATION OF MASSIVE FERRITE IN LOW OR MEDIUM CARBON ALLOY STEELS |
| YU Degang; ZHENG Jinghong; LIANG Zhengfeng; SHEN Fufa (Shanghai Jiaotong University) |
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Cite this article:
YU Degang; ZHENG Jinghong; LIANG Zhengfeng; SHEN Fufa (Shanghai Jiaotong University). MIDDLE TEMPERATURE TRANSFORMATION OF MASSIVE FERRITE IN LOW OR MEDIUM CARBON ALLOY STEELS. Acta Metall Sin, 1983, 19(5): 5-150.
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Abstract The transformation of the massive ferrite, besides the lath one, was observed in the low or medium carbon ahoy steels under middle temperatures. The massive ferrite consiste of densely dislocated substructural chunks, which are equi-axial or irregular on three dimensional morphology. They nucleate and grow noncoherently either in the interior or along the boundary of grains. No definite orientation,namely neither habit plane nor growth orientation, was found during γ→a transformation. The carbides of different arrangements which exist certain orientations and habit planes may be presented in the chunks with the decreasing growth temperature. Some island constituents rich in carbon which is composed of twinned martensite or martensite with retained austenite at room temperature may be also formed in or at the massive ferrite chunks or along the grain boundaries. The two above-mentioned orientations between the martensite and matrix are the relationship of K-S and N-W. It seems to be considered that the formation of middle temperature massive ferrite may be resulted by the γ→α transformation of a short range diffusion of Fe atoms accompanied with a long range diffusion in the way of island rich in carbon or carbide as well
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Received: 18 May 1983
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