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| THE FORMATION OF A β_Mn. TYPE PHASE IN SOME Fe-Mn-Al STEELS |
| CHANG YEN-SHEN;WANG CHU-YI;SHIH CHANG-HSU |
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Cite this article:
CHANG YEN-SHEN;WANG CHU-YI;SHIH CHANG-HSU. THE FORMATION OF A β_Mn. TYPE PHASE IN SOME Fe-Mn-Al STEELS. Acta Metall Sin, 1965, 8(3): 352-424.
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Abstract The formation of β_(Mn) type structure in several Fe-Mn-Al duplex steels with com-positions varying from 33 to 37％ Mn and 5 to 9％ Al has been systematically stud-ied by microscopic examination, X-ray diffraction analysis, microhardness indentation test,hardness measurement and impact test. The temperature range of transformation for (δ+γ) to β_(Mn) lies between 500°and1000℃. The lower temperature limit is lowered by the addition of Al and the upperlimit raised by Mn and Al. The morphology of β_(Mn) formed depends on the composition and heat treatment ofthe alloys. β_(Mn) needles are preferentially originated from δ/δ and δ/γ grain boundaries,ferrite grains, etc., and then grow into rods. At higher temperatures β_(Mn) forms inblocks along the δ/γ boundaries and later grows into δ-ferrite grains. A relief effect onthe polished surface has been observed after the formation of β_(Mn) needles and it is sug-gested that this β_(Mn) is formed by the bainitic transformation mechanism. It has beenfound that the impact value decreases and the hardness increases with increasing β_(Mn)content.
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Received: 18 March 1965
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[1] Koster, W., Tonn, W.: Arch. Eisenhuttenw., 1933-34, 7, 365．
[2] Schmatz, D. T.: Trans. AIME, 1959, 215． 113．
[3] 张彦生、师昌绪:金属学报,1964,7,285．
[4] 张彦生、师昌绪、李有柯:金属学报,1965,8,346．
[5] Hansen, M., Anderk, A.: Constitution of Binary Alloys, 2nd ed., (McGraw-Hill, 1958) , p. 111, 665, 954．
[6] Bradley, A. J., Jones, P.: Phil. Mag., 1931, 12, 1137． |
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