【作者】 吴凯； 刘国权； 胡本芙； 吴昊； 张义文； 陶宇； 刘建涛；

【Author】 WU Kai~1,LIU Guo-quan~(1,2),HU Ben-fu~1,WU Hao~1,ZHANG Yi-wen~3,TAO Yu~4,LIU Jian-tao~4 (1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China.2. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083, China.3.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China.4.High Temperature Materials Research Institution,CISRI,Beijing 100081,China.)

【机构】 北京科技大学材料科学与工程学院； 北京科技大学新金属材料国家重点实验室； 北京科技大学冶金与生态工程学院； 钢铁研究总院高温材料研究所；

【摘要】 对新型镍基高温合金FGH98Ⅰ等离子旋转电极雾化粉末颗粒的凝固组织特征进行了研究,并计算了合金粉末凝固过程的热学参数。结果表明:粉末颗粒表面凝固组织主要是树枝晶和胞状长大晶,随着粉末颗粒直径减小,冷却速度、凝固长大速度和固液界面前沿温度梯度均增大,粉末内部凝固组织由树枝晶为主逐渐转变为以胞状晶及微晶组织为主。另外,还建立了FGH98Ⅰ合金粉末粒度与二次枝晶臂距和冷却速度之间的函数关系式。更多还原

【Abstract】 The solidification microstructure characteristics of a new type nickel-based superalloy FGH98Ⅰpowders prepared by plasma rotating electrode processing(PREP) were studied and thermal parameters of the alloy powders during solidification process were calculated.The results show that the solidification microstructure of powders particle surface are dendrite and cellular structures.The cooling rates,solidification growth rates and thermal gradient increase with the decreasing particle size,the microstructure of particle interior changes from dendrite in major to cellular and microcrystal structure. In addition,the secondary dendritic arm and the cooling rate as a function of FGH98Ⅰpowders size are established.更多还原