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Na_2SO_4- and NaCl- Induced Hot Corrosion Behaviors of a Nickel-Base Superalloy with Aluminide Diffusion Coating

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Journal of Wuhan University of Technology(Materials Science) 2001年第1期16卷 59-62页

作者：安涛峰 State Key lab. fatigue/fracture Mat. Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Hot-corrosion behaviors of nickel-base superalloy and aluminide diffusion coating have been investigated in conditions of contents of Na2SO4 and NaCI molten salts at 900℃ by means of XRD and SEM. Hot-corrosion scale of the superalloy and aluminide diffusion coating were analyzed and their surface morphologies were observed. The results demonstrate that both coated and uncoated specimens are not susceptible to various contents of NaCI. That may be resulted from the AI2O3 scale formation. Growth stress was characterized by the formation of convoluted scales.

关键词： nickel-base superalloy aluminlde diffusion coating hot-corrosion

ANOMALOUS STRAIN RATE DEPENDENCE OF FLOW STRESS IN TiAl INTERMETALLIC COMPOUNDS

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Acta Metallurgica Sinica(English Letters) 1992年第5期5卷 390-394页

作者： WANG Liming ZHU Dong YAO Mei CAI Qigong ZOU Dunxu State Key lab.ratory for fatigue and fracture of Materials,Academia Sinica,Shenyang Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China State Key lab.for fatigue and Fracture of Materials Acad Sinica Shenyang China

Plastic deformation of TiAI and TiAI-V intermetallic compounds has been studied by com- pression experiment at various temperatures and strain *** show that the plastic deformation in distinct temperature range is principally controlled by the mechanisms of Peierls-Nabarro,cross slip and creep of *** TiAI-V alloy deformed at a range of 600—700 K,the negative strain rate dependence of flow stress was observed,i.e.,the more the plastic strain *** more the negative dependence will be.A possible mechanism of the anomaly could be interpreted by thermal activation of dislocation cross *** effects of temperature and strain rate on work-hardening exponent were also studied and discussed.

关键词： TiAl intermetallic compound strain rate cross-slip

Cyclic Deformation and fatigue Damage Behavior of Cu Monocrystals, Bicrystals and Tricrystals

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Journal of Materials Science & Technology 1999年第6期15卷 489-508页

作者： Wang, ZG Li, XW Zhang, ZF Jia, WP Li, SX Chinese Acad Sci Inst Met Res State Key Lab Fatigue & Fracture Mat Shenyang 110015 Peoples R China

In the present work, the cyclic deformation behavior of Cu single crystals oriented for double- and multiple slip as well as Cu bicrystals and tricrystals was investigated under constant plastic strain control at room temperature in air. The main objectives of the study are: (1) to find out the effects of crystallographic orientation and grain boundary (GB) on the cyclic stress-strain (CSS) curves; (2) to compare the cyclic deformation behavior of the double-, multiple-slip crystals, bicrystals and tricrystals with that of single-slip oriented crystals and to correlate the results with those of polycrystals; (3) to examine the corresponding dislocation structures; (4) to investigate the interactions of persistent slip bands (PSBs) with GBs and triple joint (TJ) as well as intergranular fatigue cracking in Cu bicrystals and tricrystals.

关键词： Crystals

Cyclic Saturation Dislocation Pattern Observation in the Vicinity of Grain Boundaries by Electron Channeling Contrast Technique

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Journal of Materials Science & Technology 1998年第3期14卷 211-214页

作者： Zhang, ZF Li, XW Su, HH Wang, ZG Acad Sinica Inst Met Res State Key Lab Fatigue & Fracture Mat Shenyang 110015 Peoples R China

The cyclic saturation dislocation patterns within grains and in the vicinity of low-angle grain boundaries in fatigued copper crystal were successfully observed by electron channeling contrast technique in SEM. The results show that the dislocation patterns within grains consisted of typical two-phase structure, i.e. persistent slip bands (PSB) and veins. With increasing plastic strain amplitude (gamma(pl) greater than or equal to 1.7 x 10(-3)), large amount of PSBs and regular dislocation walls were observed. The dislocation walls and PSBs could cross through the low-angle grain boundaries continuously except that the dislocation-free zone (DFZs) appeared at some local regions. Combining with the cyclic stress-strain response and dislocation patterns, the effect of low-angle grain boundaries on cyclic deformation behavior was discussed.

关键词： Copper

Characteristics of fatigue in a SiC Reinforced Aluminium Alloy

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Journal of Materials Science & Technology 1989年第4期5卷 279-283页

作者：于维成袁金才王中光隋全武 lab.ratory of fatigue and fracture of Materials IMRChina

*** matrix composite materials exhibitquite a good combination of strength andstiffness of the reinforcing phase withductility and toughness of the *** alloys reinforced with SiC parti-cles and whiskers are receiving ... 详细信息

关键词： reinforced Al alloy fatigue fracture SiC whisker

A practical model for efficient anti-fatigue design and selection of metallic materials:Ⅰ.Model building and fatigue strength prediction

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Journal of Materials Science & Technology 2021年第11期70卷 233-249页

作者： R.Liu P.Zhang Z.J.Zhang B.Wang Z.F.Zhang lab.ratory of fatigue and fracture for Materials Shi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

The high cost and low efficiency of fatigue tests are bottleneck problem for the anti-fatigue design of metallic *** this problem,a theoretical fatigue model is proposed in this study,the possible applications have also been *** results would be introduced in two serial papers,in which the first paper focuses on the model building and the applications on fatigue strength prediction;the second paper put emphasis on the influencing factors of the model parameters and the applications on fatigue strength *** this first paper,a theoretical model is proposed considering both the strength and plastic restrictions of fatigue *** the model builds up a brief relationship among yield strength(Y),tensile strength(T)and fatigue strength(F),it is named as the Y-T-F *** the verification with fatigue strength data covering various kinds of metallic materials and loading conditions,this Y-T-F model exhibits both generality and *** the Y-T-F model,the efficient fatigue strength prediction could be conducted by brief linear fitting and calculation,just through yield strength,tensile strength and several known fatigue strength ***,through its deduced Y-F model,the analytical formula of fatigue strength continuously changing with materials strengthening can be obtained,as well as the maximum value of fatigue strength and corresponding critical yield *** summary,the Y-T-F model would be useful for reducing the fatigue tests,thus providing new possibilities on the efficient anti-fatigue design and selection of metallic materials.

关键词： Yield strength Tensile strength Plasticity fatigue strength Anti-fatigue design

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Torsional fatigue Cracking and fracture Behaviors of Cold-Drawn Copper:Effects of Microstructure and Axial Stress

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Acta Metallurgica Sinica(English Letters) 2019年第12期32卷 1521-1529页

作者： Rong-Hua Li Peng Zhang Zhe-Feng Zhang School of Mechanical Engineering Liaoning Shihua UniversityFushun 113001China lab.ratory of fatigue and fracture for Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The fatigue cracking and fracture behavior of cold-drawn copper subjected to cyclic torsional loading were investigated in this *** was found that with increasing stress amplitude,the fracture mode of cold-drawn copper gradually changes from a shear fracture on transverse maximum shear stress plane to a mixed shear mode on both transverse and longitudinal shear planes and finally turns to the shear fracture on multiple longitudinal shear *** the cracking morphology and the relationship between torsional fatigue cracking and the grain boundaries,the fracture mechanism of cold-drawn copper under cyclic torsional loading was analyzed and proposed by considering the effects of the microstructure and axial stress caused by *** of the promotion of the grain boundary distribution on longitudinal crack propagation and the inhibition of axial stress on transverse crack grown,the tendency of crack propagation along the longitudinal direction increases with increasing stress levels.

关键词： Torsion fatigue behavior Crack propagation fracture mechanisms Axial stress Copper

fatigue crack growth behavior of a 170 mm diameter stainless steel straight pipe subjected to combined torsion and bending load

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Frontiers of Structural and Civil Engineering 2021年第4期15卷 905-913页

作者： Selvakumar VEERARAJAN Dakshinamurthy PUKAZHENDHI Palla GANDHI Department of Civil Engineering Taipei University of TechnologyTaipei106-08China fatigue&fracture lab.ratory CSIR-Structural Engineering Research CentreChennai600113India

In a nuclear powerplant,the rotary equipment,such as a pump directly fitted with hanger in the piping system,experiences torsional and bending *** crack growth rate occurs because of this torsional load in addition to the bending ***,it is necessary to study the fatigue behavior of piping components under the influence of combined torsional and bending *** this study,experimental fatigue life evaluation was conducted on a notched stainless steel SA312 Type 304LN straight pipe having an outer diameter of 170 *** experimental crack depth was measured using alternating current potential drop *** fatigue life of the stainless steel straight pipe was predicted using experiments,Delale and Erdogan method,and area-averaged root mean square-stress intensity factor approach at the deepest and surface points of the ***,the fatigue crack growth and crack pattern were *** a result,fatigue crack growth predicted using analytical methods are in good agreement with experimental results.

关键词： fatigue life Delale and Erdogan method RMS-SIF approach stainless steel torsion and bending load fatigue crack growth

Thermal Stress Behavior of Diffusion-bonded SiC/6061Al Laminates during Thermal Cycling

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Journal of Materials Science & Technology 1999年第2期15卷 117-120页

作者： Li, Huan Li, Jiabao Wang, Zhongguang Jiang, Chuanhai Wang, Dezun Acad Sinica Inst Met Res State Key Lab Fatigue & Fracture Mat Shenyang 110015 Peoples R China Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

In addition to the study of thermal stress behavior, the stress relaxation at elevated temperature (205 degree C) was also investigated by means of X-ray diffraction. It was found that the elastic and elastoplastic deformation in the 6061 Al layer takes place during thermal cycling, and the same closed stress temperature loop is formed in the second cycling for the aged and low temperature treated specimen. Meanwhile, it was demonstrated that the compressive stress relaxed in 6061 Al layer at 205 degree C within the range of 0.5-16 h, and which is nearly unchanged with further prolongation of time. (Edited author abstract) 19 Refs.

关键词： Laminates