化学法细化高温合金K4169的低周疲劳性能研究  

Effect of Structure Refinement by Addition of Refiner on LCF Properties of Cast Superalloy K4169

作　　者：黄太文[1] 刘林[1] 杨爱民[2] 熊玉华[3] 赵志龙[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072 [2]西安石油学院机械系,西安710065 [3]清华大学机械工程系,北京100084

出　　处：《材料工程》2004年第11期22-27,共6页Journal of Materials Engineering

基　　金：国家重点基础研究计划资助项目(G2000067202)

摘　　要：采用一种新型中间合金复合细化剂,在常规生产工艺条件下对高温合金K4169铸件进行了晶粒细化。测试了常规工艺和细晶铸造工艺两种试样的常温和中温(700℃)条件下的低周疲劳性能。结果表明,这一新型工艺方法能有效细化高温合金K4169晶粒。细晶试样的室温低周疲劳性能有较大的提高,且数据的分散性有所改善;在中温时,疲劳寿命的优劣和疲劳应变幅有关:在小应变幅条件下,细晶仍然有较高的疲劳寿命,在大应变幅条件下,细晶疲劳寿命比粗晶有所降低,但数据的稳定性较好。The ingots of cast superalloy K4169 was refined with the addition of a trace of intermetallic compounds to the melt under conventional casting condition. The low cycle fatigue (LCF) properties were tested both for normal and refined test bars. The results show that the grains can be refined to ASTM 1.7. As a result, LCF life of refined test bars is 1.2-2 times compared to that of normal ones at room temperature. As a contrast, LCF properties at 700°C are different, depending on the total strain amplitude. LCF life for refined samples are superior than coarse ones at small total strain amplitude, and inferior at high total strain amplitude. Fatigue data fluctuation is improved of fined grains at all conditions.

关 键 词：细化剂 晶粒细化 高温合金 低周疲劳性能 

分 类 号：TG113.25[金属学及工艺—物理冶金] TG146.1[金属学及工艺—金属学]