单晶高温合金再结晶的影响因素  

Influencing factors of recrystallization in single crystal superalloys

作　　者：刘丽荣[1] 祖国庆[1] 黄景胜[1] 金涛[2] 胡壮麒[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]中国科学院金属研究所高温合金研究室,辽宁沈阳110016

出　　处：《材料热处理学报》2013年第3期55-59,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50901046)

摘　　要：研究变形量、退火温度及稀土Re元素对单晶高温合金再结晶行为的影响。结果表明:随变形量的增加,再结晶区域的面积和深度增加;低变形量下再结晶晶粒数量较少,高变形量下再结晶晶粒数量较多。退火温度影响γ'相溶解率,进而影响再结晶晶粒和晶界形貌,1270℃退火,再结晶晶粒呈枝晶状,晶界有少量M6C碳化物析出;1305℃退火,再结晶晶粒为等轴状,晶界上析出的碳化物尺寸较大、数量较多。随着Re含量的增加,合金的再结晶面积明显减小,Re元素具有抑制再结晶行为的作用。Effect of deformation, annealing temperature and Re content on recrystallization behavior in single crystal superalloys was investigated. The results show that with increasing of deformation, the recrystallization area and depth increase; low-deformation promotes recrystallization grain growth, while high-deformation is in favor of recrystallization nucleation. The T＇ phase dissolution rate is influenced by annealing temperature, as a result, the recrystallized grain and grain boundary morphology are affected by annealing temperature. After annealing treatment at 1270℃ , dendritic reerystallized grains are observed and some small M6 C carbides are precipitated from grain boundaries; while after annealing treatment at 1305℃ , the reerystallized grains become equiaxial shape and a lot of bigger granular M6 C carbides are precipitated from grain boundaries. With the increasing of Re content, the reerystallized area decreases markedly, which indicates Re element can restrain the recrystallization of superallys.

关 键 词：再结晶 变形量 退火温度 RE 单晶高温合金 

分 类 号：TG132.3[一般工业技术—材料科学与工程]