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Quantitative analysis of homogenization treatment of INCONEL718 superalloy 被引量:14
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作者 缪竹骏 单爱党 +3 位作者 吴元彪 卢俊 徐文亮 宋洪伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第5期1009-1017,共9页
Quantitative analysis was employed to establish reasonable and practical homogenization model of INCONEL718 superalloy. Metallographic method was applied to determining the incipient melting temperature. The result sh... Quantitative analysis was employed to establish reasonable and practical homogenization model of INCONEL718 superalloy. Metallographic method was applied to determining the incipient melting temperature. The result shows that the incipient melting temperature of d406 mm INCONEL718 ingot is situated between 1 170 ℃ and 1 180 ℃. In order to predict the elimination process of Laves phase in quantity, a time and temperature dependent homogenization model was proposed. Among all the elements in the as-cast microstructure, Nb and Ti are the most positive segregated elements. The diffusion coefficients of alloying elements at 1 140 ℃ were obtained by fitting the linear relationship between In δ (δ residual segregation index) and time. The calculation results of diffusion coefficients were compared with other two commercial Nb-bearing superalloys. 展开更多
关键词 INCONEL718 SUPERALLOY HOMOGENIZATION Laves phase SEGREGATION
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Effects of P and B addition on as-cast microstructure and homogenization parameter of Inconel 718 alloy 被引量:4
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作者 缪竹骏 单爱党 +4 位作者 吴元彪 卢俊 胡莹 刘俊亮 宋洪伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期318-323,共6页
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 formati... 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. 展开更多
关键词 P B Inconel 718 alloy SOLIDIFICATION microstructure HOMOGENIZATION
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Solidification process of conventional superalloy by confocal scanning laser microscope 被引量:4
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作者 缪竹骏 单爱党 +3 位作者 王威 卢俊 徐文亮 宋洪伟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第2期236-242,共7页
The solidification process of a conventional superalloy, IN718, was investigated by confocal scanning laser microscope (CSLM). The liquid fraction during solidification was obtained as a function of real time and te... The solidification process of a conventional superalloy, IN718, was investigated by confocal scanning laser microscope (CSLM). The liquid fraction during solidification was obtained as a function of real time and temperature in reference with the in-situ observation. The characteristics of L→γ transformation were analyzed and the γ growing rate of each stage was also calculated. Scheil equation was employed to predict the segregation behavior, and the predict results are in consistence with the experimental results. As a result, the confocal scanning laser microscope shows a great potential for solidification process research. 展开更多
关键词 IN718 alloy SOLIDIFICATION IN-SITU confocal scanning laser microscope SEGREGATION
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磷硼复合添加对GH4169合金均匀化的影响 被引量:3
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作者 吴元彪 缪竹骏 +3 位作者 卢俊 张开国 单爱党 宋洪伟 《材料热处理学报》 EI CAS CSCD 北大核心 2011年第6期26-31,共6页
利用微观组织分析手段、差示扫描量热法和布氏硬度研究了复合添加适量磷、硼对GH4169合金铸态组织和均匀化的影响。结果表明:GH4169合金中磷、硼的复合添加促进Nb、Ti的偏析和块状Laves相的形成。适量的磷、硼导致GH4169合金的初熔温度... 利用微观组织分析手段、差示扫描量热法和布氏硬度研究了复合添加适量磷、硼对GH4169合金铸态组织和均匀化的影响。结果表明:GH4169合金中磷、硼的复合添加促进Nb、Ti的偏析和块状Laves相的形成。适量的磷、硼导致GH4169合金的初熔温度下降40℃,相应的均匀化温度选择在1120℃而不是通常的1160℃。均匀化处理可有效消除Laves相和显微偏析,硬度测试表明磷、硼有可能阻碍合金元素的扩散,均匀化时间有所延长。 展开更多
关键词 磷和硼 GH4169合金 均匀化 显微组织 硬度
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不同冷速下GH4169高温合金凝固过程的原位观察 被引量:14
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作者 王威 轩福贞 +3 位作者 缪竹骏 卢俊 徐文亮 宋洪伟 《机械工程材料》 CAS CSCD 北大核心 2011年第9期64-67,71,共5页
利用带有红外加热炉的共聚焦激光扫描显微镜对GH4169高温合金在冷速分别为5,50,200K·min^(-1)条件下的凝固过程进行了原位观察,并通过图形处理软件计算了自由表面固相含量随温度及时间的变化关系;用光学显微镜观察了各冷速下高温... 利用带有红外加热炉的共聚焦激光扫描显微镜对GH4169高温合金在冷速分别为5,50,200K·min^(-1)条件下的凝固过程进行了原位观察,并通过图形处理软件计算了自由表面固相含量随温度及时间的变化关系;用光学显微镜观察了各冷速下高温合金的凝固组织,计算了合金凝固后的二次枝晶间距。结果表明:GH4169高温合金在凝固过程中随着温度的降低,枝晶不断生长,新核不断形成;随着冷速的增加,枝晶组织明显细化;固液转变依次经历初始平缓增加段、稳定快速增长段、残液转变减慢段三个阶段,冷速的增加致使合金凝固后显微组织的二次枝晶间距减小,偏析相更为均匀细小。 展开更多
关键词 GH4169高温合金 共聚焦激光扫描显微镜 凝固 冷速
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Inconel 690合金的高温拉伸变形行为 被引量:6
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作者 张开国 卢俊 +3 位作者 缪竹骏 吴元彪 吕维洁 宋洪伟 《机械工程材料》 CAS CSCD 北大核心 2011年第11期16-19,23,共5页
采用Gleeble-3800型热模拟试验机研究了Inconel 690镍基合金在1000~1250℃、应变速率为0.1~10s^(-1)条件下的高温拉伸变形行为,获得了流变应力和断裂特征随变形温度和应变速率的变化规律。结果表明:该合金在高温拉伸变形中的流变应力... 采用Gleeble-3800型热模拟试验机研究了Inconel 690镍基合金在1000~1250℃、应变速率为0.1~10s^(-1)条件下的高温拉伸变形行为,获得了流变应力和断裂特征随变形温度和应变速率的变化规律。结果表明:该合金在高温拉伸变形中的流变应力随变形温度的升高而减小,随应变速率的增大而增大,1100~1250℃是其较佳的塑性变形区;合金的高温拉伸变形流变应力可用双曲正弦形式的本构方程来描述,其变形激活能为654.7kJ·mol^(-1);随着变形温度的升高和应变速率的增大,合金的断裂机制由微孔聚集型断裂向沿晶断裂转变。 展开更多
关键词 INCONEL 690合金 高温拉伸变形 流变应力 断裂
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