PRECIPITATION OF CARBIDES AT GAMMA-ALPHA BOUNDARIES IN ALLOY STEELS
PRECIPITATION OF CARBIDES AT GAMMA-ALPHA BOUNDARIES IN ALLOY STEELS
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DOI：
10.1098/rspa.1971.0063
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发表时间：
1971-01-01
影响因子：
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通讯作者：
HONEYCOMBE, RW
中科院分区：
文献类型：
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作者：
DAVENPORT, AT;HONEYCOMBE, RW
在600 ~ 850°C温度范围内，含有1 ~ 2 wt %钒和0.2 wt %碳的奥氏体转变为铁素体中极细的V4 C3分散体。碳化物颗粒在相变过程中在γ─α相界的连续位置上形核，形成间距为5 ~ 30 nm的片状沉淀物，而单个颗粒的直径为3 ~ 10 nm（相间沉淀）。高分辨率电子显微镜提供了碳化物颗粒和转变前沿的形态和晶体学的细节。在铁+6.3wt%钨+0.23wt%碳合金中已经研究了类似的反应，其中M6 C以更粗的尺度沉淀，使得能够对转变前沿进行精确观察。还在铁+3.45wt%钼+0.22wt%碳合金中检查了相间沉淀。提出了一个模型，考虑到观察到的形态和晶体学的碳化物相和铁素体的相间沉淀。
Austenite containing 1 to 2 wt % vanadium and 0.2 wt % carbon, held in the range 600 to 850°C transforms to an extremely fine dispersion of V4C3in ferrite. The carbide particles are nucleated on theγ─αphase boundary at successive positions during the transformation, forming sheets of precipitate which are 5 to 30 nm apart, while the individual particles are 3 to 10 nm diameter (interphase precipitation). High resolution electron microscopy has provided details of the morphology and crystallography of the carbide particles and the transformation front. A similar reaction has been studied in an iron +6.3 wt % tungsten + 0.23 wt % carbon alloy in which M6C precipitates on a much coarser scale enabling precise observations to be made on the transformation front. Interphase precipitation has also been examined in an iron + 3.45 wt % molybdenum + 0.22 wt % carbon alloy. A model is proposed for the interphase precipitation which takes into account the observed morphology and crystallography of the carbide phases and of the ferrite.