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对于航天推进和发电燃气轮机,为了实现更高的效率和性能并同时降低成本和排放,需要发展先进的镍基单晶高温合金。随着合金的发展,合金的铸造技术已经从定向凝固(DS)发展到单晶(SX)。单晶取向与择优取向的偏差已经成为单晶高温合金最重要的铸造缺陷之一。在自行设计的高温度梯度定向凝固装置中,采用改进的Bridgeman法,用螺旋选晶器拉制出DZ417G合金的单晶。使用XRD和EBSD对其取向进行分析研究。结果表明:较小角度的螺旋选晶器可以有效地减少单晶取向与择优取向的偏差。
For space propulsion and power generation gas turbines, advanced nickel base single crystal superalloys need to be developed to achieve higher efficiency and performance while reducing costs and emissions. As the alloys evolve, the alloy casting technology has evolved from directional solidification (DS) to single crystal (SX). Deviation of single crystal orientation and preferred orientation has become one of the most important casting defects in single crystal superalloy. In the self-designed high-temperature gradient directional solidification device, a modified Bridgeman method was used to fabricate a single crystal of DZ417G alloy with a spiral crystal selector. Their orientation was analyzed using XRD and EBSD. The results show that the smaller angle of the spiral crystal selector can effectively reduce the deviation between the single crystal orientation and the preferred orientation.