具有良好综合性能的DD2单晶高温合金

DD2单晶高温合金是具有良好综合性能的第一代单晶高温合金。该合金具有高的抗氧化性能、瞬时拉伸及持久性能 ,尤其是在 85 0℃和 90 0℃下经过 10 0 0～ 30 0 0 h长期时效后 ,无任何 TCP相产生 ,仍能保持良好的高温持久性能。     

高温合金细晶铸造技术研究

研制成功了国内第一台细晶铸造真空炉。在该炉上，用控制碜数法获得的Ｋ４１８的合金细晶叶片的晶粒度可 ，在普通铸造温度下用铸型搅动法获得的整体涡轮，其幅板毂部位的晶粒度可达ＡＳＴＭＭ１１．５－ＡＳＴＭ３级。     

DD3单晶合金的评估

叙述了北京航空材料研究院和美国普拉特惠特尼公司对ＤＤ３单晶合金的成本，主要力学性能指标和单晶铸性能进行的评估。评估认为：ＤＤ３合金有优良的力学性能和良好的铸造性能性能，     

Effect of gamma prime depletion on creep behaviour of a nickel base superalloy (Inconel alloy X-750)

Specimens of a nickel base superalloy were exposed to air at 1423 K to study the effect of gamma prime depletion in the near-surface region on the creep behaviour of the alloy. The results showed that the gamma prime depletion in the air-exposed specimens caused a weakening effect, leading to enhanced creep rate. Kachanov’s damage parameterf was determined and was found to be 0·5 indicating that the near-surface region, comprising of surface oxide, grain boundary oxide and gamma prime depleted region, carried a small fraction of the applied stress. It is further shown that the damaging effect is more pronounced in thinner specimens.     

镍基高温合金的真空感应熔炼脱氧

研究了在真空感应炉中使用CaO坩埚熔炼镍基高温合金的脱氧效果，分析了加入0.02%C和0.5%Al对脱氧的影响，初步进行了在CaO坩埚中脱氧反应的热力学计算。研究表明：熔化期可以脱除大部分的氧；采用CaO坩埚，选择合适的熔炼工艺及C和Al加入量，可使氧的含量降低到小于0.0006%。     

高温合金粉末内部孔洞的研究概况

阐述了等离子旋转电极工艺（PREP）制取的镍基高温合金粉末内部孔洞的形成机理，分析了导致孔洞形成的因素，提出了降低粉末内部孔洞应采取的措施，研究结果表明：孔洞的尺寸随着粉末粒度的下降而减小，在相同雾化制粉工艺参数条件下，粗粉中孔洞的数量多于细粉。随着棒料转速的提高，空心粉数量增加，此外，雾化室内混合惰性气体压力降低或混合惰性气体中氩气含量提高，均能使空心粉数量降低。     

电渣母材用GH1040合金的VOD精炼

设计的初炼炉出钢成分及其出钢温度，为GH1040母材在VOD精炼过程中提供了所需要的热能。采取电渣重熔工艺，能大幅度降低冶炼成本并提高生产率，为大批量GH1040以及铁基高温合金开辟了一条新的冶炼途径。     

Influence of aluminide diffusion coating on the tensile properties of the Ni-base superalloy René 80

Ni-base superalloy René 80 is widely used in manufacturing aircraft turbine blades. The service temperature of this alloy is in the range of 760-982 °C. Although this alloy possesses suitable mechanical, oxidation and hot corrosion properties, it is coated in order to increase its wear, oxidation, erosion and hot corrosion properties against harmful environmental service conditions.In this paper the influence of applying diffusion coating (CODEP-B) on the tensile properties of René 80 has been studied in the temperature range of 22-982 °C. Experimental results show that the tensile properties of the coated specimens are relatively lower than that of uncoated ones in the same conditions. But in the service conditions, coating could have some useful and positive effects practically.In aircraft turbines in service conditions, the maximum strain the blades experience is always bellow 1% and in this range of strain no crack initiates and generates on the applied coating surface. Thus in this situation, the coating would certainly have protective properties preventing from oxidation, hot corrosion and erosion of the base metal.     

定向凝固高温合金DZ125的修复热处理

对实际生产中叶片在真空热处理工序可能出现的问题，如设备故障造成的欠温、保温不足、冷却速度偏低等进行了模拟，研究了修复热处理对DZ125合金组织和性能的影响。结果表明，出现上述情况时，可以对DZ125合金叶片进行修复热处理。