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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of Nb on hot tensile deformation behavior of cast Haynes 25 Co-Cr-W-Ni alloy
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Effects of Nb on hot tensile deformation behavior of cast Haynes 25 Co-Cr-W-Ni alloy

机译：Nb对铸造海恩斯25 CO-CR-W-Ni合金热拉伸变形行为的影响

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摘要

Effect of Nb on the hot tensile deformation behavior of cast Haynes 25 Co-Cr-W-Ni alloy was investigated in temperature range of 950-1200 degrees C. In the base alloy, thermodynamic calculations showed that M23C6 and M6C are the stable forms of carbides at temperatures below 1000 degrees C and over 1050 degrees C, respectively. For Nb-containing alloy, however, WC and NbC are observed below 1050 degrees C. At higher temperatures, W carbides dissolve and tungsten diffuses into NbC particles to form complex carbides. The yield point phenomena (YPP) were observed in both alloys at temperatures over 1050 degrees C due to the immobilization of matrix dislocations by W, Cr and C. Addition of Nb increased the strength and elongation due to the precipitation of NbC carbides. Absorbing the solute atoms and favoring dynamic recrystallization (DRX) seems to be the possible mechanisms. Loss of hot ductility occurred in both alloys at 1050 degrees C. It was attributed to the dissolution of carbides into matrix and their negative effects on dynamic recovery (DRV) and recrystallization. DRX was the major microstructural mechanism at high temperature, e.g. 1150 degrees C. At low temperatures, e.g. 950 degrees C, only DRV occurred. (C) 2018 Elsevier B.V. All rights reserved.
机译：在温度范围内的950-1200℃。在基体合金Nb对铸造的海恩斯25的Co-Cr-W-Ni合金的热拉伸变形行为的影响进行了研究，热力学计算表明，M23C6和M6C是的稳定形式在温度低于1000度C碳化物和超过1050℃，分别。对于含Nb合金，然而，WC和NbC的观察下面1050摄氏度在较高温度下，W的碳化物溶解和钨扩散形成的NbC粒子以形成复合碳化物。屈服点现象（YPP）在两种合金中观察到在温度超过1050摄氏度由于W，Cr和Nb的C.的添加基质位错的固定化增加了强度和伸长率由于NbC的碳化物的析出。吸收溶质原子和有利于动态再结晶（DRX）似乎是可能的机制。热延展性的损失发生在两种合金在1050℃下将其归因于碳化物的溶解到基质和动态恢复（DRV）和重结晶的负面影响。 DRX是在高温下的主要显微结构机构，例如1150摄氏度在低温下，例如950℃，只发生DRV。 （c）2018年elestvier b.v.保留所有权利。

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