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Investigation on high temperature strengthening and toughening of iron-base superalloy

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Journal of University of Science and Technology Beijing 2003年第1期10卷 44-48页

作者： Xishan Xie Zhengdong Mao 等 HighTemperatureMaterialsResearchLaboratories UniversityofScienceandTechnologyBeijingBeijing100083China DayeSpecialtyStell(Group)Co.Ltd Huangshi435001China

A new modified A-286 (15Cr-28Ni-1.5Mo-lW-2Ti-Nb-Al) (mass fraction) designated as GH871 is characterized by high strengths but low ductility at 650℃ stress rupture and also high crack propagation rates at 650℃ creep and creep/fatigue interaction conditions. For improvement of ductility and crack propagation behaviour, a primary vacuum induction melting and followed electro-slag refining process (VIM+ESR) has been adopted instead of air melting and electro-slag refining process (AIM+ESR). Vacuum melted GH871 (VIM+ESR) can keep the high strength level of this alloy and improve the ductility and also decrease crack propagation rates by this alloy purification. It is a good combination of strengthening and toughening for the alloy improvement and development.

关键词： superalloy modified A-286 stress rupture low cycle fatigue(LCF) crack propagation

Effect of Solidification Condition on Microstructure and Mechanical Properties of Single Crystal Superalloy

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Journal of Materials Science & Technology 2001年第1期17卷 89-90页

作者： Wanming ZHANG Wei DU and Hengzhi FU State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China State Key Lab. of Solid. Proc. Northwestern Polytechnol. Univ. Xi'an 710072 China

CMSX-2 single crystals with different primary dendrite arm spacing were obtained on directional solidification apparatus with high temperature gradient (250 K/cm). The microstructure and elevated temperature stress r... 详细信息

关键词： Single Crystal Superalloy single crystals directional solidification temperature gradient elevated temperature dendrite arm spacing stress rupture

Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy

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Journal of Iron and Steel Research International 2023年第3期30卷 601-609页

作者： Rui Wang Dao-hong Wang Peng Zhang Zhi-qing Yang Jing-jing Liang Jin-guo Li Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Jiang Su Feiyue Machine and Pump Group Co. Ltd.Jingjiang 225300JiangsuChina

The effect of boron addition(0.010,0.015,and 0.020 wt.%)on the microstructure and mechanical properties of an additively manufactured superalloy was *** as-built microstructure was investigated by scanning electron microscopy and transmission electron *** results demonstrate that boron precipitates as M_(3)B_(2)boride at the grain *** increase in boron content increases the amount ofγ/γ′eutectic and the size and fraction of M_(3)B_(2)*** creates nanoscale fine borides at grain boundaries,which significantly reinforces grain *** mechanical property analysis indicated that the addition of boron improved the tensile ductility at 760℃and stress rupture properties at 760℃/780 ***,with the excessive addition of boron,the mechanical property was reduced.

关键词： Additive manufacturing Superalloy Boron Grain boundary stress rupture Tension

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVEL 718 SUPERALLOY

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Acta Metallurgica Sinica(English Letters) 2006年第6期19卷 418-424页

作者： J.H.Du X.D.Lü J.L.Qu Q.Deng J.Y.Zhuang Z.Y.Zhong Department of Superalloy Central Iron and Steel Research InstituteBeijing 100081China

Recently,a novel 718 superalloy with remarkable structural stability at 680℃has been designed and fabricated by CISRI(Central Iron and Steel Research Institute)*** identification of novel 718 alloy under the above-mentioned heat-treatment condition was performed using optical microscopy(OM),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Results show that the novel 718 alloy has outstanding structural stability at 680℃.The novel 718alloy possess excellent structural stability and good mechanical properties,which is attributed to y-phase strengthening and also to the specific sandwich structure of theγ′+γ'strengthening phase.

关键词： novel 718 superalloy microstructure mechanical property stress rupture creep

Effects of Ru on microstructure stability and mechanical properties of Ni3Al single crystal alloy

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Progress in Natural Science:Materials International 2011年第4期21卷 286-292页

作者： Shu-suo LI,Xiao-ying XIE,Li-wu JIANG,Ya-fang HAN School of Materials Science and Engineering,Beihang University,Beijing 100191,China School of Materials Science and Engineering Beihang University Beijing 100191 China

The effect of Ru on microstructure stability and stress rupture properties of a Ni3Al single-crystal alloy was investigated. The experimental results showed that the addition of 2%Ru(mass fraction) improved the microstructure stability due to the restraint of harmful Y-NiMo phase formation during the thermal exposure at the high temperature above 1 000℃.And the reason may be that the addition of Ru increased the degree of Mo supersaturation in bothγandγ’ phases,and hence suppressed the precipitation of Y-NiMo *** results of stress rupture tests under the testing condition of 1100℃,120 MPa showed that the addition of 2% Ru in the alloy improved the stress rupture lives significantly for thermal exposed *** improvement of the stress rupture properties may be attributed to the restraint of Y-NiMo phase precipitation and growth by the addition of the proper amount Ru.

关键词： Ni3Al microstructure stability Ru Y-NiMo phase stress rupture

Metallurgical Forensics: Investigating a Superheater Tube Failure in Industrial Process Plants

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World Journal of Engineering and Technology 2024年第3期12卷 742-758页

作者： Kok Toong Leong Engineering Department QSM Associates Singapore

A metallurgical forensic investigation was conducted to determine the cause of a failed superheater tube. Analysis techniques by Visual Examination, Energy Dispersive X-ray Analysis, Mechanical Testing and Metallographic Investigation were conducted, together with a comparative study from an inlet elbow section that did not fail. The superheater tube suffered premature failure after being in service for about two years. It was concluded that the failed tube underwent overheating, corrosion-erosion, embrittlement, and eventual failure under its internal pressure by stress rupture. The analysis revealed intergranular cracks, window fracture features and spheroidization of pearlite with grain growth. A possible contribution to embrittlement was from copper. Follow-ups and recommendations were provided, as well as covering materials, inspection, and operational considerations.

关键词： Superheater Tubes Thermal Degradation Corrosion-Erosion Embrittlement stress rupture