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| GRAIN COARSENING BEHAVIOUR TOWARDS AUSTENITIC HOT WORK TOOL STEELS AND EFFECT OF ALLOYING ELEMENTS |
| by XIE Changsheng; HE Xiangshan; CUI Kun (Huazhong University of Science and Technology; Wuhan) |
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Cite this article:
by XIE Changsheng; HE Xiangshan; CUI Kun (Huazhong University of Science and Technology; Wuhan). GRAIN COARSENING BEHAVIOUR TOWARDS AUSTENITIC HOT WORK TOOL STEELS AND EFFECT OF ALLOYING ELEMENTS. Acta Metall Sin, 1986, 22(6): 13-21.
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Abstract The grain coarsening behaviour towards the austenitic hot work tool steels has been studied by means of quantitative metallography. The stability of MC is improved and its volume fraction in the steel is increased by alloying element Nb added. The ratio of Ni/Mn substantially affects the grain coarsening. The volume fraction of M_23C_6 and MC carbides in the steel increases with the increase of the Ni/Mn ratio. Both Nb added and Ni/Mn ratio increased raise thegrain coarsening temperature. The modification of the Gladman's model may then be proposed by the comparison of different models of grain coarsening with assumption of uneven in convexo-concave interface along grains. The modified Gladman's expression is given as: R_o =πr/3f_v(3/-2/Z) that may fairly predict the actual grain size observed.
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Received: 18 June 1986
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1 Smith, C.S., Trans. Metall. Soc. AIME, 175(1948) , 15．
2 Koul, A. K.; Pickering, F, B., Acta Metall., 30(1982) , 1303．
3 Gladman, T., Proc. R. Soc. London, A294(1966) , 298． |
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