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首页> 外文期刊>ISIJ international >Two-phase Separation of Primary MX Carbonitride during Tempering in Creep Resistant 9Cr1MoVNb Steel
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Two-phase Separation of Primary MX Carbonitride during Tempering in Creep Resistant 9Cr1MoVNb Steel

机译：耐蠕变9Cr1MoVNb钢回火过程中主要MX碳氮化物的两相分离

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摘要

Precipitation behaviour during heat treatment has been investigated on 9Cr1 MoVNb steel. Coarse primary and fine secondary MX carbonitrides are observed in the as normalized condition. On the other hand, coarse primary MX is not detected after tempering at 1 038 K, and Nb-rich and V-rich fine secondary MX carbonitrides and M_(23)C_6 carbide are observed in the as tempered condition. Variations of metallic elements concentrations of Nb-rich MX and V-rich MX in the as tempered condition are within the relatively small ranges. Average diameter of 34 nm for V-rich MX is slightly larger than that of 24 nm for Nb-rich MX in the as tempered condition. Both size and metallic elements concentrations of the fine secondary MX observed in the as normalized condition are almost the same as those of Nb-rich MX observed in the as tempered condition. A composition of metallic elements of the coarse primary MX varies along the line between those of Nb-rich MX and V-rich MX in a Cr-Nb-V ternary phase diagram. It has been considered that, at normalizing temperature of 1 323 K, Nb-rich MX and V-rich MX forms solid solution and composition of the primary MX varies along the tie line between those two phases. Two-phase separation of primary MX into Nb-rich MX and V-rich MX may be caused by the miscibility gap in primary MX and another two phases at the tempering temperature of 1 038 K.
机译：已经研究了9Cr1 MoVNb钢在热处理过程中的沉淀行为。在正常条件下，可以观察到粗的一级和二级细MX碳氮化物。另一方面，在1 038 K进行回火后，未检测到粗大的主MX，在回火状态下观察到了富Nb和富V的细副MX碳氮化物和M_（23）C_6碳化物。在回火状态下，富Nb MX和富V MX的金属元素浓度变化在相对较小的范围内。富V的MX在回火条件下的平均直径为34 nm略大于富Nb的MX的24 nm的平均直径。在归一化条件下观察到的细次级MX的尺寸和金属元素浓度与在回火条件下观察到的富Nb MX几乎相同。在Cr-Nb-V三元相图中，粗初级MX的金属元素组成沿富Nb MX和富V MX金属元素之间的线变化。已经考虑到，在1323 K的归一化温度下，富Nb的MX和富V的MX形成固溶体，并且主MX的组成沿这两相之间的连接线变化。主MX两相分离成富Nb的MX和富V的MX可能是由于主MX和在1.038 K的回火温度下的另外两相的混溶性间隙引起的。

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