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.
To increase efficiency and improve performance,reducing cost and emissions,advanced single crystal Ni-based superalloys are required in aerospace propulsion and power generating gas turbines.With the development of alloy,significant improvements in casting techniques have been achieved by introducing the directionally solidified (DS) casting process followed by single crystal (SX) technique.The deviation of preferred orientation of single crystal superalloys is one of the most important defects in casting.In directional solidification equipment with high temperature gradient,single crystal specimens of DZ417G alloy were prepared successfully by the modified Bridgeman method with spiral grain selector.The orientation was investigated by means of X-ray diffraction (XRD) and electron backscattered diffraction (EBSD).The results show that the crystal selector with a smaller angle can effectively reduce the deviation of preferred orientation.
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