Acta Metall Sin  1998, Vol. 34 Issue (12): 1289-1294    DOI:

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MICROSTRUCTURES AND PROPERTIES OF DZ40M Co-BASE SUPERALLOY AFTER LONG-TERM AGEING AT 950℃

JIANG Wenhuil; YAO Xiangdong; GUAN Hengrong;HU Zhuangqi(Institute of Metal research; The Chinese Academy of Sciences; Shenyang 11O015)(Shenyang Polytechnic University; Shenyang 110023)Correspondent:JIANG Wenhui; Tel: (0U)2384353l-556o8; Fax: (024)23891320Manuscript received 1997-12-16; in revised form 1998-03-10

JIANG Wenhuil; YAO Xiangdong; GUAN Hengrong;HU Zhuangqi(Institute of Metal research; The Chinese Academy of Sciences; Shenyang 11O015)(Shenyang Polytechnic University; Shenyang 110023)Correspondent:JIANG Wenhui; Tel: (0U)2384353l-556o8; Fax: (024)23891320Manuscript received 1997-12-16; in revised form 1998-03-10. MICROSTRUCTURES AND PROPERTIES OF DZ40M Co-BASE SUPERALLOY AFTER LONG-TERM AGEING AT 950℃. Acta Metall Sin, 1998, 34(12): 1289-1294.

Abstract References Related Articles Recommended Metrics Download:  PDF(2768KB)  Export:  BibTeX | EndNote (RIS)       Abstract  DZ40M, a newly developed directionally solidified Co-base superalloy was agedat 950℃ for long term. Its microstructural charateristics and mechanical properties at roomand elevated temperatures were studied. Long-term ageing results in substantial increase intensile strength and sharp reduction in ductility at room temperature. Its effect oil mechanicalprOPerties at elevated temperatures is dependent on eXperimental parameters. At 980℃ , 83 MPa,stress-rupture life is prolonged and at 816 ℃, 215 MPa, it is shortened. However, in all of thecases, the alloy possesses a high stress-rupture ductility. During ageing, primary carbide M7C3and MC decomposed sluggishly, fine M23C6 precipitated copiously around them and M6C formedon the surfaCe of some M7C3. Decomposition of the primary carbides promoted the precipitationof M23C6 by supplying carbon atoms and segregation of tungsten caused the precipitation ofM6C. It is thought that the change of mechanical properties of the alloy is attributed to theM23C6 precipitation. Key words:  directional solidification      Co-base superalloy      ageing      carbide transformation      mechanical property      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I12/1289 1管恒荣,姚向东,张静华,张志亚,李英敖,胡壮麒.金属学报,1995;31(Suppl).):308(Guan H G, YaO X D, Zhang J H, Zhang Z Y, Li Y G, Hu Z Q. Acta Metall sin ,1995; 31(Suppl.): 308 2姚向东,张静华,张志亚,李英敖,赵乃仁,管恒荣,胡壮麒.金属学报,1995;31:A32. 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