固溶处理对Stellite 6B钴基高温合金中碳化物的影响
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摘要
研究了锻造后钴基高温合金Stellite 6B中碳化物的类型和组织形貌,以及高温固溶处理对合金中碳化物的影响。研究表明,Stellite 6B合金的显微组织由面心立方钴基固溶体与一次碳化物M_7C_3和二次碳化物M_(23)C_6组成。高温固溶处理下,碳化物M_(23)C_6先转变为M_7C_3,然后溶解到基体,当固溶时间短时,易形成分布在晶界处的连续的网状碳化物。固溶温度为1280℃,保温10 h时,网状碳化物溶解的更加充分,能够得到完全固溶的奥氏体基体。
The type and structure of the carbides in cobalt-base superalloy Stellite 6 B and the effect of high temperature solution treatment on the carbides were studied. The results show that the microstructure of the alloy is composed of a cobalt-base solid solution with a facecentered-cubic crystal structure,the primary carbide M_7C_3 and the secondary carbide M_(23)C_6. Though the high temperature solution treatment,the carbide M_(23)C_6 first transforms into M_7C_3,and then dissolves into the matrix. When the solution time is short,the network carbides are easy to form at the grain boundary. It is easy to obtain the completely solid-soluted austenite which the network carbides dissolves more fully after the solution treatment at 1280 ℃ for 10 h.
The type and structure of the carbides in cobalt-base superalloy Stellite 6 B and the effect of high temperature solution treatment on the carbides were studied. The results show that the microstructure of the alloy is composed of a cobalt-base solid solution with a facecentered-cubic crystal structure,the primary carbide M_7C_3 and the secondary carbide M_(23)C_6. Though the high temperature solution treatment,the carbide M_(23)C_6 first transforms into M_7C_3,and then dissolves into the matrix. When the solution time is short,the network carbides are easy to form at the grain boundary. It is easy to obtain the completely solid-soluted austenite which the network carbides dissolves more fully after the solution treatment at 1280 ℃ for 10 h.
引文
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[4]赵阳,王磊,于腾,等.定向凝固钴基高温合金DZ40M中碳化物析出与再结晶的交互作用[J].稀有金属材料与工程,2008,37(6):1032-1036.Zhao Yang,Wang Lei,Yu Teng,et al.The interaction between precipitation and recrystallization of direction solidified cobalt base superalloy DZ40M[J].Rare Metal Materials and Engineering,2008,37(6):1032-1036.
[5]Liu R,Yao J H,Zhang Q L,et al.Microstructures and hardness/wear performance of high-carbon Stellite alloys containing molybdenum[J].Metallurgical and Materials Transactions A,2015,46(12):5504-5513.
[6]Berthod P,Michon S,Aranda L,et al.Experimental and thermodynamic study of the microstructure evolution in cobalt-base superalloys at high temperature[J].Calphad-Computer Coupling of Phase Diagrams and Thermochemistry,2003,27(4):353-359.
[7]Lane J R,Grant N J.Carbide reactions in high temperature alloys[J].Transactions of the American Society for Metuls,1952,44:113-137.
[8]Liu R,Yao J H,Zhang Q L,et al.Relations of chemical composition to solidification behavior and associated microstructure of Stellite alloys[J].Metallography,Microstructure and Analysis,2015,4(3):146-157.
[9]Jiang Wenhui.Relationship between microstructures and mechanical properties of DZ40M directionalloy solidified cobalt-base superalloy DZ40M[D].Shenyang:the Institute of Metal Research the Chinese Academy of Sciences,1999:85.
[10]Jiang W,Yao X,Guan H,et al.Carbide behavior during high temperature creep in DZ40M Co-base superalloy[J].Journal of Materials Science and Technology,1999,15(6):515-518.
[11]张钱珍,程世长,刘正东,等.Inconel 690合金TT处理后的析出相[J].钢铁研究学报,2009,21(6):40-44.Zhang Qianzhen,Cheng Shichang,Liu Zhengdong,et al.Precipitated phase of alloy Inconel 690 after thermal treatment[J].Journal of Iron and Steel Research,2009,21(6):40-44.
[12]赵阳,王磊,于腾,等.DZ40M合金再结晶形核的唯象行为[J].东北大学学报(自然科学版),2009,30(2):208-212.Zhao Yang,Wang Lei,Yu Teng,et al,Phenomenological behavior of recrystallized nucleation in DZ40M alloy[J].Journal of Northeastern University(Natural Science),2009,30(2):208-212.
[13]Sima C T.A contemporary view of cobalt-base alloys[J].JOM,1969.21(12):27-42.