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Al含量对Inconel 718合金中δ相组织演变的影响
引用本文:周喜顺,何亚斌,刘建辉,辛士进,王东,崔艳芳,李鹏,董莹.Al含量对Inconel 718合金中δ相组织演变的影响[J].兵器材料科学与工程,2012,35(6):74-77.
作者姓名:周喜顺  何亚斌  刘建辉  辛士进  王东  崔艳芳  李鹏  董莹
作者单位:中国兵器科学研究院宁波分院,内蒙古包头,014030;中核北方核燃料元件有限公司,内蒙古包头,014035;包头三德电池材料有限公司,内蒙古包头,014030
摘    要:采用扫描电子显微镜和Thermo-Calc热力学计算等方法,研究3种不同Al含量的Inconel 718合金在标准热处理和不同保温时间下δ相的形貌特征、溶解行为及3种合金中δ相含量的变化。结果表明:Al含量低的合金中δ相溶解特征主要表现为沿针状δ相的长度方向断开,在短时间内溶解为短棒状及颗粒状;Al含量高的合金中δ相溶解优先从晶内开始,其晶界上的δ相溶解缓慢,对抑制晶界迁移,控制奥氏体晶粒长大有重要作用;Inconel 718合金中δ相含量随溶解温度的提高而降低,Al含量提高使合金中δ相的溶解速度减慢,溶解温度提高。

关 键 词:Inconel  718合金  δ相  溶解行为

Effect of Al content on delta phase microstructure evolution in Inconel 718 alloys
ZHOU Xishun , HE Yabin , LIU Jianhui , XIN Shijin , WANG Dong , CUI Yanfang , LI Peng , DONG Ying.Effect of Al content on delta phase microstructure evolution in Inconel 718 alloys[J].Ordnance Material Science and Engineering,2012,35(6):74-77.
Authors:ZHOU Xishun  HE Yabin  LIU Jianhui  XIN Shijin  WANG Dong  CUI Yanfang  LI Peng  DONG Ying
Affiliation:1(1.Ningbo Branch of China Academy of Ordnance Science,Baotou 014030,China; 2.China North Nuclear Fuel Limited Company,Baotou 014035,China; 3.Baotou Santoku Battery Materials Limited Company,Baotou 014030,China)
Abstract:The dissolution mechanism and morphology feature of δ phase in standard as-heated 718 alloys with three different Al contents for different holding times were investigated by scanning electron microscopy(SEM) and Thermo-Calc software.The fraction of δ phase was counted using the Photoshop software.The results indicate that the dissolution of δ phase in 718 alloy with lower Al content is mainly characterized as the dissolution from long needle shape to short rod or granule,and the δ phase in the grains of 718 alloys with higher Al content dissolves firstly while the dissolution of δ phase at grain boundaries is slower.So the migration of grain boundary is inhibited,the grain size of 718 alloys can be controlled effectively to some extent.The fraction of δ phase decreases gradually with the increase of temperature.The dissolution temperature of δ phase can be increased with the increase of Al content in 718 alloys but the dissolution velocity decreases with it.
Keywords:Inconel 718 alloy  delta phase  dissolution behavior
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