W.H. Jiang
,
X.D. Yao
,
H.R. Guan and Z.Q. Hu(1) Department of Superalloys
,
Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China2) Department of Metal Materials Engineering
,
Shenyang Polytechnic University) Shenyang 110023
,
China )Manuscript received in revised form 11 September 1998
金属学报(英文版)
Secondary M23C6 precipitation around primary MC carbide in a directionally solidified cobalt-base saperalloy was investigated duriny aging at 850℃. The results show that it was closely related to the decomposition of the MC. Two mechanisms were suggested,i.e. the in situ reaction, MC+γ→M23C6+C, and the direct reaction, M+C→M23C6,in which MC acted as a carbon source.
关键词:
cobalt-base superalloy
,
null
,
null
,
null
袁福河
,
孙晓峰
,
管恒荣
中国腐蚀与防护学报
研究了钴基高温合金K40S在950℃和1000℃的循环氧化行 为.发现合金在950℃ 400 h以内的抗循环氧化性能较好.合金在1000℃氧化50 h以后因为 表面氧化膜剥落开始出现失重现象.在1000℃循环氧化初期的产物主要为Cr2O3，其次 为CoCr2O4和少量的CoO，400 h以后，Cr2O3基本剥落，合金表面由于Cr的损耗又生 成Cr2WO6、NiCr2O4以及挥发性的WO3氧化产物.添加Si和Mn元素使K40S合金抗循 环氧化性能明显地比不含Si和Mn元素的DZ40M钴基高温合金优越.
关键词:
钴基高温合金
,
cyclic oxidation
