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Flow Behavior and Evolution of Microstructure during Hot Deformation for a High Mo Stainless Steel

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Journal of Materials Science & Technology 2000年第3期16卷 341-344页

作者： yourong xu, Liangsheng CHEN, Deying WANG and Lei JIN (School of Materials Science and Engineering, Shanghai University, Shanghai 201800, China) School of Materials Science and Engineering Shanghai University Shanghai 201800 China

The mechanical behaviors of high Mo austenitic stainless steel OOCr20Nil8Mo6Cu[N] have been investigated using the methods of hot compression simulation test on the Thermecmaster-Z simulator. The dynamic recrystallization kinetic equation was established, Avrami coefficient n lies in between 0.9～2 depending on deformation parameters. A perfect flow stress model considering dynamic recrystallization was also established. Dynamic recrystallization tends to complete at 1050℃ and high strain rate, but at temperature below 950℃, it is hard to occur. Double-stage interrupt compression tests were carried out. Activation energy for static and metadynamic re-crystallization have been obtained respectively (QSRX=483.7, QMDEX=253.5 kJ/mol). Avrami coefficient of MDRX is about 0.5, and t.0.5-kinetics equations of SRX and MDRX have also been constructed. The evolution of microstructures during interrupt compression deformation was investigated. Static and metadynamic recrystaltlzation is essential to improve plasticity, at temperature above 1000℃ increasing interpass time has advantage for static and metadynamic recrystallization.

关键词： Stainless steel

DYNAMIC MECHANICAL BEHAVIOURS OF HIGH Mo AUSTENITIC STAINLESS STEEL DURING HOT DEFORMATION

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Acta Metallurgica Sinica(English Letters) 1992年第7期5卷 60-64页

作者： xu yourong GU Qing WANG Deying, Shanghai University of Science and Technology, Shanghai, ChinaGU Jufang Q U Tiancai, Shanghai Iron and Steel Research Institute, Shanghai, China xu yourong, Professor, Department of Materials Science, Shanghai University of Science and Technology, Shanghai 201800, China

The dynamic mechanical behaviours of super low carbon high Mo austenitic stainless steel (00Cr20Nil8Mo6CuN)during hot deformation have been studied by using Formaster-Press hot working simulator. The hot deformation equation, as well as the relationship between peak strain, peak stress and Zener-Hollman parameter, together with the deformation activation energy have been resulted through the experiments.

关键词： hot deformation austenitic stainless steel peak strain peak stress dynamic behaviour

EFFECT OF LASER SCANNING SPEED ON PHASE CONSTITUTION AND WEAR RESISTANCE OF LASER CLADDING HARD FACING ALLOY STELLITE 12

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Acta Metallurgica Sinica(English Letters) 1993年第5期6卷 300-303页

作者： xu yourong ZHANG Henghua CHEN Darning XIE Fuchun xu Mingyu Shanghai University of Science and Technology,Shanghai,ChinaCHEN Lanying SU Baorong QIAN Hongbin Shanghai Optics and Fine Mechinery Research Institute,Academia Sinica,Shanghai,China xu yourong,professor,Department of Materials Science and Engineering,Shanghai University of Science and Technology,Shanghai 201800,China

Effect of laser scanning speed on phase constitution,microstructure,microhardness and wear resistance of laser-cladding hard facing alloy Stellite 12 has been investigated by means of a cross-flow-type CO_2 laser of 1.5 *** laser-cladding layer on the alloy consists of ma- trix phase of suppersaturated solid solution γ(Co,Cr)and complex hexagonal carbide M_7C_*** certain condition,at higher laser scanning speed,the suppersaturated solubility of elements increases in γ(Co,Cr),and the precipitation of the complex carbtde M_7C_3 de- creases,so the microhardness increases and the wear resistance *** at slower laser scanning speed,more complex carbide M_7C_3 may precipitate,and the wear resistance may be ***,it is believed that the principal factor in improving wear resistance is the precipitation of carbide M_7C_3,while increment of microhardness is the suppersaturated solu- bility of elements in matrix phase γ(Co,Cr).

关键词： laser-cladding Stellite 12 phase constitution wear resistance

Mitochondria-targeted nanoparticles overcome chemoresistance via downregulating BACH1/CD47 axis in ovarian carcinoma

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Chinese Chemical Letters 2024年第5期35卷 344-350页

作者： Ke Gong Jinghan Liao Jiangtao Lin Quan Wang Zhihua Wu Liting Wang Jiali Zhang Yi Dong yourong Duan Jianhua Chen State Key Laboratory of Systems Medicine for Cancer Shanghai Cancer InstituteRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200032China Department of Ultrasound Xinhua HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200092China Department of Oncology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China

The platinum-based chemotherapy is a routine strategy for the treatment of ovarian cancer,while it is prone to chemoresistance in clinical,which hinders the ***,it is urgently needed to elucidate the underlying mechanism of drug resistance and form the appropriate *** sequencing results showed that cisplatin(DDP)resistant ovarian cancer overexpressed BTB and CNC homology 1(BACH1),and up-regulated the“don’t eat me”signal *** identified that hemin,a BACH1 inhibitor,could effectively down-regulate BACH1 and simultaneously inhibit ***,hemin has a synergistic effect with *** designed a pH-responsive nanoparticle(H/D@FA-CaP-NPs)in which folic acid(FA)ensured targeting of ovarian cancer cells,while hemin inhibited BACH1 as well as down-regulated CD47,achieving the promotion of apoptosis of tumor cells and inducing phagocytosis of tumors by ***,hemin has a synergistic effect with DDP to promote apoptosis of tumor ***,hemin and DDP was encapsulated within hydrophobic 1,2-distearoyl-sn-glycero-3-phosphoethanolamine(DSPE)to form a tight core,and hydrophilic polyethylene glycol 2000(PEG2000)and calcium phosphate(CaP)formed the outside shell,and FA was modified on the surface of *** terms of function,(a)FA enhanced the active targeting of nanoparticles to tumors;(b)NPs targeted mitochondria to induce reactive oxygen species(ROS)production;(c)hemin encapsulated in nanoparticles could specifically target BACH1,thereby down regulating CD47;(d)hemin had a synergistic effect with DDP,thus augmenting the ***,mitochondria-targeted nanoparticles H/D@FA-CaP-NPs promoted tumor apoptosis and mobilized phagocytosis to treat tumor,providing a novel scheme for clinical treatment of cisplatin-resistant ovarian carcinoma.

关键词： Cisplatin-resistant Hemin BACH1 CD47 Phagocytosis ROS Synergistic effect

Diffusion Behaviour of Fe-Cu Interface of Copper Brazed Double-wall Steel Tubes

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Journal of Materials Science & Technology 1993年第4期9卷 279-282页

作者： yourong xu Deying WANG Qi JIN Yijian ZHOU Shanghai University of Science and Technology,Shanghai,201800,ChinaFan HU Chao LIU Iron and Steel Research Institute of Baoshan Iron and Steel Complex,Shanghai,201900,China

By means of electron probe(EPMA),scanning electron microscope(SEM),and optical microscope (QM),the diffusion behaviour on the Fe-Cu interface of copper brazed double-wall steel tubes and the microstructure of the diffusion layer have been *** are three kinds of metallurgical bonds between copper plating layer and steel substrate: (1)the Cu diffusing into steel substrate along grain boundary of ferrite;(2)the Cu diffusion into grain bulk of ferrite: (3)the Fe diffusing into Cu *** copper brazed double-wall steel tubes are formed by the combination of the diffusions mentioned above and this is the reason for excellent mechanical and technological properties of the copper brazed double-wall steel tubes.

关键词： metallurgical bond Bundyweld tube diffusion behaviour interface

“正常”冠状动脉慢血流现象与血浆同型半胱氨酸水平的相关分析

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临床心血管病杂志 2009年第6期25卷 436-439页

作者：许朝祥王耀国杜心清许有容福建医科大学附属第二医院心内科福建泉州362000

目的:探讨冠状动脉慢血流现象(SCF)与血浆同型半胱氨酸(Hcy)水平的相关关系。方法:选择我院行冠状动脉造影(CAG)显示心外膜主要冠状动脉无明显病变的患者64例。通过校正TIMI血流计帧法(cT-FC)计算各支冠状动脉的TIMI帧数。冠状动脉平均... 详细信息

目的:探讨冠状动脉慢血流现象(SCF)与血浆同型半胱氨酸(Hcy)水平的相关关系。方法:选择我院行冠状动脉造影(CAG)显示心外膜主要冠状动脉无明显病变的患者64例。通过校正TIMI血流计帧法(cT-FC)计算各支冠状动脉的TIMI帧数。冠状动脉平均帧数大于27帧定义为SCF,将患者分为SCF组(24例)和对照组(40例)。应用t检验和卡方检验比较2组各项临床资料的差异,并采用多元逐步回归和Logistic回归分析方法对相关因素进行分析。结果:2组患者性别、高血压、糖尿病、吸烟所占比例、血脂水平、血糖水平的差异无统计学意义,而SCF组的Hcy水平显著高于对照组[(12.55±2.65)μmol/L:(8.39±1.98)μmol/L,P<0.001],年龄小于对照组[(53.25±8.67)岁:(57.85±8.08)岁,P=0.036]。多元逐步回归方程:cTFC=9.979+2.256×Hcy-0.14×年龄(F=122.268,P<0.001)。Logistic回归分析表明Hcy是影响SCF的危险因素(OR2.214,P<0.001)。结论:Hcy与SCF有关,Hcy可能参与了SCF发生的病理生理过程。

关键词：冠状动脉血流速度同型半胱氨酸

Effects of higher femoral tunnels on clinical outcomes,MRI,and second-look findings in double-bundle anterior cruciate ligament reconstruction with a minimal 5-year follow-up

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Chinese Medical Journal 2024年第4期137卷 465-472页

作者： Lin Lin Haijun Wang Jian Wang Yongjian Wang yourong Chen Jiakuo Yu Sports Medicine Department Beijing Key Laboratory of Sports InjuriesPeking University Third HospitalBeijing 100191China Peking University Institute of Sports Medicine Beijing 100191China

Background:To perform anatomical anterior cruciate ligament reconstruction(ACLR),tunnels should be placed relatively higher in the femoral anterior cruciate ligament(ACL)footprint based on the findings of direct and indirect femoral *** the clinical results of higher femoral tunnels(HFT)in double-bundle ACLR(DB-ACLR)remain *** purpose was to investigate the clinical results of HFT and lower femoral tunnels(LFT)in ***:From September 2014 to February 2016,83 patients who underwent DB-ACLR and met the inclusion and exclusion criteria were divided into HFT-ACLR(group 1,n=37)and LFT-ACLR(group 2,n=46)according to the position of femoral *** and at the final follow-up,clinical scores were evaluated with International Knee Documentation Committee(IKDC),Tegner activity,and Lysholm *** stability of the knee was evaluated with KT-2000,Lachman test,and pivot-shift *** degeneration grades of the International Cartilage Repair Society(ICRS)were evaluated on magnetic resonance imaging(MRI).Graft tension,continuity,and synovialization were evaluated by second-look ***-to-sports was assessed at the final ***:Significantly better improvement were found for KT-2000,Lachman test,and pivot-shift test postoperatively in group 1(P>0.05).Posterolateral bundles(PL)showed significantly better results in second-look arthroscopy regarding graft tension,continuity,and synovialization(P0.05).No statistically significant differences were found in IKDC subjective score,Tegner activity,and Lysholm score between the two *** return-to-sports rate was found in group 1 with 86.8%(32/37)vs.65.2%(30/46)in group 2(P=0.027).Conclusion:The HFT-ACLR group showed better stability results,better PL,and higher return-to-spo

关键词： Anterior cruciate ligament reconstruction Direct insertion Double bundle Second-look arthroscopy Femoral tunnel Anterior cruciate ligament rupture

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热加工时动态及静态回复中亚结构的变化

钢铁 1988年第11期23卷 25-29页

作者：徐有容高飞田云川上海科技大学大连铁道学院中国科学院金属研究所

采用formastor-press研究了Cr25Ti铁素体钢热变形中及热变形后的动态及静态回复过程。研究表明,在1200℃变形中,多边形化过程有明显的亚晶界迁移发生,动态回复作用使晶内形成完整亚晶;在900℃变形中,亚晶等轴细小,有原位再结晶现象;静... 详细信息

采用formastor-press研究了Cr25Ti铁素体钢热变形中及热变形后的动态及静态回复过程。研究表明,在1200℃变形中,多边形化过程有明显的亚晶界迁移发生,动态回复作用使晶内形成完整亚晶;在900℃变形中,亚晶等轴细小,有原位再结晶现象;静态回复时,平均亚晶尺寸的变化出现略有降低而后增加的现象,这是由于变形刚终止时的静态回复速率大于变形中的动态回复速率所致。

关键词：亚晶界蚀坑晶粒面缺陷颗粒动态回复静态回复塑性变形热变形晶界迁移位错墙原位再结晶位错密度晶体不完整性亚结构变形组织中亚

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高钼不锈钢热加工特性与综合流变应力模型

钢铁 2000年第5期35卷 55-59页

作者：陈良生徐有容王德英张晓燕金蕾上海大学材料科学与工程学院上海201800

利用 THERMECMASTER-Z热 /力模拟机对 0 0 Cr2 0 Ni18Mo6Cu[N]高钼氮奥氏体不锈钢进行单道次热压缩试验 ,研究其动态力学行为和热加工特性 ,建立了其动态再结晶动力学方程 ,并从位错理论出发 ,建立了一个考虑了动态再结晶的完整的流变... 详细信息

利用 THERMECMASTER-Z热 /力模拟机对 0 0 Cr2 0 Ni18Mo6Cu[N]高钼氮奥氏体不锈钢进行单道次热压缩试验 ,研究其动态力学行为和热加工特性 ,建立了其动态再结晶动力学方程 ,并从位错理论出发 ,建立了一个考虑了动态再结晶的完整的流变应力模型 ,并将模型预报值与实验值进行比较和验证 ,表明其具有很高的精确度 ,还对变形后压缩模拟试样进行了动态组织结构的研究。

关键词：热变形奥氏体不锈钢动态再结晶流变应力