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首页> 外文期刊>ISIJ international >Effect of Secondary Nitride Particles on Grain Growth in a Fe-20 mass% Cr Alloy Deoxidised with Ti and Zr
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Effect of Secondary Nitride Particles on Grain Growth in a Fe-20 mass% Cr Alloy Deoxidised with Ti and Zr

机译：二次氮化物对Ti和Zr脱氧的Fe-20质量％Cr合金晶粒生长的影响

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摘要

The pinning effects of different particles on grain growth were investigated in Fe-20 mass% Cr alloys deoxidised with Ti and Zr. More specifically, in-situ observations of the specimen surface were made during heat treatment at 1 200 and 1 400℃ in a High Temperature - Confocal Scanning Laser Microscope (HT-CSLM). Initially, primary and secondary particles were investigated using thermodynamic equilibrium calculations and the SEM/EDX observations. Thereafter, the pinning effect of secondary nitride particles on grain boundary migration and the kinetics of the grain growth process were investigated. It was found that secondary nitride particles generally have a considerable effect on the pinning of grain boundary migration during heating treatment. This is especially true for heat treatment at 1 400℃. Despite that the pinning effect of TiN particles decreases due to dissolution of these particles, the implicit pinning effects of ZrO_2, ZrO_2-ZrN and ZrO_2-ZrN-TiN particles appear. Thus, despite that TiN individually is ineffective in causing grain-boundary pinning at high-temperature, TiN is effective as a compound with ZrO_2 and ZrN in pinning grain-boundaries at high temperatures. The changing of the uniformity of grain size distributions during grain growth at different N contents and temperatures was discussed based on the consideration of the geometric standard deviation of the grain size distribution (σ_g).
机译：研究了Ti和Zr脱氧的Fe-20质量％Cr合金中不同颗粒对晶粒生长的钉扎效应。更具体地，在高温-共聚焦扫描激光显微镜（HT-CSLM）中在1200℃和1400℃的热处理期间对样品表面进行原位观察。最初，使用热力学平衡计算和SEM / EDX观察来研究初级和次级粒子。此后，研究了次生氮化物颗粒对晶界迁移的钉扎效应和晶粒生长过程的动力学。已经发现，二次氮化物颗粒通常对热处理期间的晶界迁移的钉扎有相当大的影响。在1400℃的热处理中尤其如此。尽管TiN颗粒的钉扎效应由于这些颗粒的溶解而降低，但ZrO_2，ZrO_2-ZrN和ZrO_2-ZrN-TiN颗粒的隐式钉扎效果仍然出现。因此，尽管TiN单独地不能有效地引起高温下的晶界钉扎，但是TiN作为与ZrO_2和ZrN的化合物在高温下钉合晶界时是有效的。基于晶粒度分布的几何标准偏差（σ_g），讨论了在不同氮含量和温度下晶粒生长过程中晶粒度分布均匀性的变化。

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