Al含量对Inconel 718合金中δ相组织演变的影响  

Effect of Al content on delta phase microstructure evolution in Inconel 718 alloys

作　　者：周喜顺[1] 何亚斌[2] 刘建辉 辛士进[1] 王东[1] 崔艳芳[1] 李鹏[1] 董莹[1] 

机构地区：[1]中国兵器科学研究院宁波分院,内蒙古包头014030 [2]中核北方核燃料元件有限公司,内蒙古包头014035 [3]包头三德电池材料有限公司,内蒙古包头014030

出　　处：《兵器材料科学与工程》2012年第6期74-77,共4页Ordnance Material Science and Engineering

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。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 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.

关 键 词：INCONEL 718合金 Δ相 溶解行为 

分 类 号：TG135[一般工业技术—材料科学与工程]