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Journal of Materiomics 2021年第1期7卷 185-194页

作者： Hao Chen Hui Gu Juanjuan Xing Zhengjuan Wang Guohong Zhou Shiwei Wang School of Materials Science and Engineering Materials Genome InstituteShanghai UniversityShanghai200444China State Key Laboratory of High Performance Ceramics and Superfine microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China

The A2B2O7 series of ternary oxides are derivatives of fluorite structure over a wide range of rA/*** by two rare-earths the A-site,La2-xLuxZr2O7 ceramics were found transparent only in pore-free microstructures with similar grain sizes of pyrochlore(PY)and defective fluorite(DF)*** solubilities of Lu and La in both phases were found by imaging and energy-dispersive spectroscopy analysis in scanning electron *** dual-phase microstructures were developed with liquid-phase resulted from the exothermal reactions,creating a miscibility gap between two structures to moderate their competing grain *** in grain growth behaviors in liquid-phase is described by a nucleation line in La2Zr2O7-Lu2Zr2O7 phase *** of solution levels in DF grains and co-existing of dual-phase grain clusters in common orientation were revealed in transparent ceramics by electron backscattered diffraction,resulted by epitaxial relation of two phases promoted by the *** vacancies and various hole states common in both phases were revealed by characteristic cathodoluminescence *** collective effects of pores,phase and grain boundaries,oxygen vacancies on scattering or absorption of visible light enables to establish a hierarchical microstructure-transparency relationship in such complex oxide ceramics,which could be tailored or further optimized by controllable sintering.

关键词： Fluorite derivatives Transparency dual-phase microstructure Mutual solubility Defects

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Strength, strain capacity and toughness of five dual-phase pipeline steels

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Journal of Iron and Steel Research International 2021年第6期28卷 752-761页

作者： Yi Ren Xian-bo Shi Zhen-guo Yang Yi-yin Shan Wei Ye Gui-xi Cai Ke Yang State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The effect of microstructures on strength,strain capacity and low temperature toughness of a micro-alloyed pipeline steel was *** various dual-phase microstructures,namely,acicular ferrite and a small amount of(around 2 vol.%)polygonal ferrite(AF+PF),polygonal ferrite and bainite(PF+B),polygonal ferrite and martensite/austenite islands(PF+M/A),polygonal ferrite and martensite(PF+M)and elongated polygonal ferrite and martensite(ePF+M),have been *** results show that AF+PF microstructure has high yield strength and excellent low temperature toughness,whereas its yield ratio is the *** ferrite-based dual-phase steels,PF+B,PF+M/A and PF+M microstructures show better strain capacity and low temperature *** strain capacity and low temperature toughness of ePF+M microstructure are the worst due to its high *** relationship between microstructure,strength,strain capacity and toughness has been *** on the results,the optimum microstructure for a better combination of strength,strain capacity and toughness is suggested to be the one having appropriate polygonal ferrite as second phase in an acicular ferrite matrix.

关键词： Pipeline steel dual-phase microstructure Strength Strain capacity Toughness

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Enhancement of Strength–Ductility Balance of the Laser Melting Deposited 12CrNi2 Alloy Steel Via Multi-step Quenching Treatment

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1234-1244页

作者： Wei Zhang Zhi-Hong Dong Hong-Wei Kang Chen Yang Yu-Jiang Xie Mohamad Ebrahimnia Xiao Peng School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230000China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Zhejiang Handsome Intelligent Remanufacturing Technology Co.Ltd jiaxing 314000China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

A ferrite–austenite 12CrNi2 alloy steel additively manufactured by laser melting deposition(LMD) was heat treated by direct quenching(DQ) and tempering inter-critical quenching(TIQ) at 800 ℃ for enhancing its strength–ductility balance. Both heat-treated alloy steels have the martensite–ferrite dual-phase(DP) microstructures. The volume fractions of martensite in the two treated alloy steels are nearly similar(~ 85 vol%), while the sizes of the prior austenitic grain for martensite are different. The martensite-dominated DP microstructure resulted in an obvious improvement in strength–ductility balance of the alloy steel. Compared with the DQ treatment, the multi-step TIQ treatment caused the strength–ductility balance of the alloy steel to be enhanced due to its higher total elongation. The better ductility of the TIQ-treated alloy steel can be attributed to the optimization of the microstructure. The preferred orientation of ferritic grain in the as-deposited alloy steel which was adverse to plastic deformation through dislocation slip was eliminated via the multi-step TIQ treatment. Moreover, the TIQ treatment promoted the formation of finer-grained martensite with larger areas of grain boundaries and twinning boundaries which resulted in the enhancement of the coordinated deformability of the martensite with the ferrite.

关键词： Laser melting deposition Alloy steel dual-phase microstructure Mechanical property Work-hardening rate

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Effect of microstructure on Hydrogen Induced Cracking Behavior of a High Deformability Pipeline Steel

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Journal of Iron and Steel Research International 2015年第10期22卷 937-942页

作者： Xian-bo SHI Wei YAN Wei WANG Lian-yu ZHAO Yi-yin SHAN Ke YANG Institute of Metal Research Chinese Academy of Sciences University of Chinese Academy of Sciences Petro China Pipeline Company

The hydrogen induced cracking （HIC） behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures, ferrite and bainite （F＋B）, ferrite and martensite/austenite islands （F＋M/A） and ferrite and martensite （F＋M）, respectively. The HIC test was conducted in hydrogen sulfide （H2S）-saturated solution. The results showed that the steels with F＋B and F＋M/A dual-phase microstructures had both higher deformability and better HIC resistance, whereas the harder martensite phase in F＋M microstructure was responsible for the worst HIC resistance. The band-like hard phase in dual-phase mi- crostructure was believed to lead to increasing susceptibility to HIC.

关键词： pipeline steel high deformability dual-phase microstructure mechanical property hydrogen induced cracking

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