EQUILIBRIUM SOLUBILITY AND COMPOSITION OF MIXED CARBONITRIDES IN MICROALLOYED AUSTENITE

被引：29
作者：
HOUGHTON, DC [1 ]
机构：
[1] NATL RES COUNCIL CANADA, INST MICROSTRUCT SCI, OTTAWA K1A 0R6, ONTARIO, CANADA
来源：
ACTA METALLURGICA ET MATERIALIA | 1993年 / 41卷 / 10期
关键词：
D O I：
10.1016/0956-7151(93)90114-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A thermodynamic framework is presented which treats the mixing of refractory metal carbides and nitrides, e.g. Ti, Nb and V which appear in microalloyed steels. The intermixing of metal solutes, carbon and nitrogen on a single precipitate crystal lattice is considered, using a quasi-regular solution model. Two extreme cases are considered; complete intermixing of all binary compounds to provide an upper limit for precipitate stability, and mutual immiscibility of binary compounds allowing only the simultaneous coprecipitation of carbides and nitrides. These extreme cases provide an upper and lower bound for carbonitride solubility. Specific examples are used to illustrate precipitation from austenite of a ternary carbonitride, NbCyN1-y, the quaternary mixed carbonitrides TixNb1-xCyN1-y, TixV1-xCN1-y, and VxNb1-xCyN1-y and the quinery nitride, TixTayNbzV1-x-y-zN. The determination of solution parameters allow the computation of the multi-component phase diagram Fe-SIGMA(i)Mi SIGMA(j)X(j). Finally, the time-temperature constraints or processing are briefly addressed by allowing limited precipitate intermixing, whilst maintaining equilibrium between solutes in austenite.
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页码：2993 / 3006
页数：14
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