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HYDROGEN DAMAGE IN HIGH PURITY IRON

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 305-308页

作者： WU Yichu CHANG Xiangrong TIAN Zhongzhuo xiao jimei University of Science and Technology Beijing,Beijing,China Beijing Univ of Science and Technology Beijing China

Hydrogen damage in iron or 99.99% purity has been investigated by Doppler broadening *** results show that when the iron is charged with hydrogen in 0.5mol/L H_2SO_4 solution,the critical current density to cause hydrogen damage is 20mA/cm^*** a little As_2O_3,saying 250mg/L,added to H_2SO_4 solution,even rather small current density.≤0.2mA/cm^2,would cause hydrogen *** the help ofi slow tensile test,it revealed that the hydrogen damage occurred in the specimen may be influential to the subsequent process of deformation and fracture.

关键词： hydrogen damage critical current density positron annihilation technique hydrogen-induced defect

CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

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Acta Metallurgica Sinica(English Letters) 1992年第9期5卷 178-182页

作者： QIAO Lijie LIU Rui xiao jimei University of Science and Technology Beijing,Beijing,China

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词： stress corrosion cracking stress compoonent brass ammonia solution

DYNAMIC RECRYSTALLIZATION OF INTERMETALLIC COMPOUND Fe_3AI

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 603-608页

作者： LIN Junpin WANG Jingyun CHU Wuyang xiao jimei (University of Science and Technology Beijing, Beijing 100083), China

Dynamic restoration mechanism of Fe3Al during hot compression at 900-1300℃and strain rates of 1-10￣(-3)s￣(-1)was studied. For values of the parameter Z larger or lower than the critical value, the dynamic recrystallization or recovery only may take place respectively. Dynamic recrystallization occurs through subgrain nucleation. The true stress increases with the increase of true strain during hot compression. The jerky flow appears in all true stress-true strain curves and more obvious with the decrease of the strain rate.

关键词： dynamic recrtstallization Fe_3Al hot compression

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铁路车轴钢50与40的对比

材料导报 2000年第6期14卷 7-8页

作者：肖纪美北京科技大学材料物理系北京100083

从五个命题对比了铁路车轴用50及40钢;强度和韧性适中考虑的设计思想;加速试验;腐蚀介质的富集;取消冲击试验;碳含量。

关键词：碳含量腐蚀介质铁路车轴钢 50钢 40钢设计

EFFECT OF COMPOSITION ON HYDROGEN EMBRITTLEMENT IN Ni-Fe FCC ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 443-448页

作者： HU Wei WANG Yanbin CHU WuYang xiao jimei University of Science and Technology Beijing,China Associate Professor,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China Beijing Univ of Science and Technology Beijing China

The ductility loss and threshold stress intensity,K_(IH)during hydrogen charging were measured for pure Ni and four Ni-Fe fcc *** results show that ductility loss in 40Ni60Fe alloy and K_(IH)a 50Ni50Fe alloy have a minimum *** variations of the amounts of hydride, hydrogen evolution and dislocation structure with composition have been *** va- riation of hydrogen embrittlement susceptibility with composition measured by ductility loss and by K_(IH)or K_(IH)/K_C can be explained by means of the synthetical effects of amount of hydride,solutionized hydrogen and the extent of dislocation planarity on hydrogen embrittlement susceptibility.

关键词： Ni-Fe alloys hydrogen embrittlement

X-RAY TOPOGRAPHIC STUDY OF HYDROGEN DAMAGE IN Fe-3 wt-% Si ALLOY

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Acta Metallurgica Sinica(English Letters) 1993年第8期6卷 87-91页

作者： WANG Yanbin WANG Anrong CHU Wuyang xiao jimei University of Science and Technology Beijing,Beijing,China associate professor,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China Beijing Univ of Science and Technology Beijing China

The formation and aggravation of hydrogen damage in Fe-3 wt-％ Si alloy during cathodic charging Were studied by means of Lange transmission X-ray *** showed that hydrogen damage did not form in the specimens charged in 0.5 mol/L H_2S0_4 so- lution without poison,and occurred with addition of 250 mg/L As_2O_3 even at very low charge current *** charging at a certain current density,the size of the damage may enlarge up to a limit yet no more by prolonged *** damage size increased with increase of charging current density,but not so apparent at high current density. An external tensile stress could promote the formation of hydrogen damage obviously. It seems that for charging in H_2SO_4 solution containing poison,the drop of hydrogen permeation curve against time prolongation is due to the formation of hydrogen damages.

关键词： hydrogen embrittlement X-ray topography Fe-3 wt-%Si alloy

MECHANISM OF HYDROGEN FACILICATED CLEAVAGE IN TITANUM ALUMINIDE

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 286-291页

作者： CHU Wuyang xiao jimei University of Science and Technology Beijing,Beijing,ChinaTHOMPSON AW Carnegie Mellon University,U.S.A

Both hydrogen induced cracking and overload crack initiated at same characteristic distance, r~*,within the plastic zone along the slip line when the plastic zone developed to a critical ex- *** the overload crack. K_(IC)=αr~*^(1/2)[σ_F^((n+1)/2n)/σ_(ys)^((1-n)/2n)],σ_F=σ_0+g[2μbσ_(th)/π~2L(1-v)]^(1/2) For the hydrogen induced cracking: K_(IH)=αr~*^(1/2)[σ_F(H)^((n+1)/2n)/σ_(ys)(H)^((1-n)/2n)], σ_F(H)={σ_0(H)+g[2μbσ_(th)(H)/π~2L(1-v)]^(1/2)}/k Hydrogen pomoting the dislocation multiplication and motion would result in σ_0(H)1,Therefore,hydrogen promoting the cleavage fracture in titanum aluminide can be due to that hydrogen facilitates the local plastic deformation,which results in σ_F(H)<σ_F and then K_(IH)

关键词： Ti_3Al intermetallic compound hydrogen induced crack

INTERPHASE　STRESS　CORROSION　CRACKING　OF　ALLOY　Ti－24Al－11Nb　IN　METHANOL　SOLUTION

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Acta Metallurgica Sinica(English Letters) 1996年第2期9卷 121-128页

作者： ZHANG Yue CHU Wuyang xiao jimei(Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China) OUYANG Shixi YUAN Runzhang(State Key Laboratory for Synthesis and Processing of Advanced Materials.Wuhan University of Techn Univ of Science and Technology Beijing Beijing China

For alloy Ti-24Al-11Nb,stress corrosion cracking(SCC) in methanol solution and hydrogen induced cracking(HIC) during dynamic charging at room temperature have been *** has shown that the normalised threshold stress intensities of SCC failure for various microstructures are KISCC/KC =0.53 0.69 and the threshold value for SCC arresting KISCC/ KIC=*** threshold values of HIC during dynamic charging are close to that of SCC,but da/dt or fracture time of HIC is one to three orders of magnitude smaller or longer than that of SCC,*** surface for HIC is also different from that for *** the Ti-24Al-Nb alloy-methanol systein,a kind of inierphase SCC has been found For the microstructures resulting from furnace cooling,SCC initiated and propagated preferentially along theα2/βinterphase boundaries,displaying the microstructure on the fracture surface of ***,there is no interphase SCC for the microstructure resulting from air cooling.

关键词： Ti-24Al-11Nb,hydrogen induced cracking,interphase stress corrosion cracking methanol

xiaoyi Yusi decoction(消异育嗣汤)improves in vitro fertilization and embryo transfer outcomes in patients with endometriosis

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Journal of Traditional Chinese Medicine 2023年第5期43卷 1026-1033页

作者： JIANG Wenjing JIANG Huaying YUAN Lihua SA Yuanhong xiao jimei SUN Hongqi SONG Jingyan SUN Zhengao First Clinical College Shandong University of Traditional Chinese MedicineJinan 250014China Emergency Department Laizhou Maternal and Child Health Hospital of ShandongLaizhou 261400China College of Traditional Chinese Medicine Shandong University of Traditional Chinese MedicineJinan 250014China Reproductive and Genetic Center of Integrated Traditional and Western Medicine the Affiliated Hospital of Shandong University of Traditional Chinese MedicineJinan 250011China Department of Traditional Chinese Medicine Qingyun County Maternity and Child Health Care Hospital of DezhouQingyun 253799China Reproductive Center of Heze Hospital of Traditional Chinese Medicine Heze 274000China Zhengzhou Key Laboratory of Children's Infection and Immunity Children's Hospital Affiliated to Zhengzhou UniversityZhengzhou 450000China

OBJECTIVE:To investigate the effect of—xiaoyi Yusi decoction(XYYSD,消异育嗣汤),a Traditional Chinese Medicine(TCM),on in vitro fertilization and embryo transfer(IVF-ET)in patients with endometriosis,and to study the mechanism underpinning the ***:Women who underwent IVF-ET were divided into three groups by simple randomization:the treatment(n=32;with TCM treatment),patient(n=28;with endometriosis alone),and control(n=33;with male factor alone)*** luteal phase short-acting gonadotropin-releasing hormone agonist prolonged protocol was used in all three *** compare the changes in TCM scores and reproductive outcomes before and after TCM intervention in patients with endometriosis,partial least-squares discriminant analysis was used to analyze the follicular fluid samples of each group and screen and compare metabolites using the MetaboA nalyst ***:The clinical data indicated that following TCM intervention,kidney deficiency and blood stasis symptom patterns improved dramatically in patients with endometriosis and that their clinical pregnancy rate increased significantly(71.9%vs 57.1%,P<0.05).Metabolomics showed that the two groups of samples were separated before and after TCM *** TCM intervention,the intervention group was close to the control group,indicating that the TCM had a certain *** analysis revealed that after TCM intervention,the metabolism of glycerin phospholipid,pyruvate,and citric acid was ***:Through the pyruvate and glycerophospholipid metabolism pathways and tricarboxylic acid cycle,the TCM XYYSD successfully improved kidney deficiency and blood stasis symptom pattern,as well as the clinical reproductive outcomes of patients with endometriosis-related infertility.

关键词： endometriosis infertility metabolomics kidney deficiency blood stasis fertilization in vitro embryo transfer xiaoyi Yusi decoction