Effects of P and B addition on as-cast microstructure and homogenization parameter of Inconel 718 alloy  

磷硼复合添加对Inconel 718合金铸态组织及均匀化处理参数的影响(英文)

作　　者：缪竹骏[1] 单爱党[1] 吴元彪[1] 卢俊[2] 胡莹[1,2] 刘俊亮[2] 宋洪伟[2] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]宝山钢铁股份有限公司宝钢研究院,上海201900

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第2期318-323,共6页中国有色金属学报（英文版）

基　　金：Project (08dj1400402) supported by the Major Program for the Fundamental Research of Shanghai Committee of Science and Technology,China

摘　　要：The effects of phosphorus and boron addition on the as-cast microstructure and homogenization parameters of Inconel 718 were studied. The results indicate that the addition of phosphorus and boron promotes the formation of blocky Laves phase. Due to the strong segregation behavior of boron in the final residual liquid, a low melting B-bearing phase enriched in Nb, Mo and Cr is observed. According to the differential scanning calorimeter results and electron probe micro-analysis characterization, the solidification sequence of Inconel 718 with phosphorus and boron addition in best combination is determined as L→L＋γ→L＋γ＋MC→L＋γ＋MC＋Laves→γ＋MC＋Laves＋MC＋Laves＋B-bearing phase. Accordingly, the homogenization temperature is recommended to be adjusted at least 40°C lower than that of standard Inconel 718 due to the existence of low melting B-bearing phase.研究磷硼复合添加对Inconel 718高温合金铸态组织及均匀化处理参数的影响。结果表明:磷硼的加入促进块状Laves相的形成。由于硼在最后残余液相中大量富集,形成一种富含Nb、Mo和Cr的含硼相。根据DSC和电子探针分析结果,确定磷硼复合添加Inconel 718高温合金的凝固顺序为L→L+γ→L+γ+MC→L+γ+MC+Laves→γ+MC+Laves+含硼相。由于低熔点含硼相的存在,磷硼复合添加Inconel 718高温合金的均匀化处理温度应比标准Inconel 718合金低至少40°C。

关 键 词：P B Inconel 718 alloy SOLIDIFICATION microstructure HOMOGENIZATION 

分 类 号：TG132.32[一般工业技术—材料科学与工程]