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Effect of Ce on Inclusions and impact property of 2Cr13 Stainless Steel

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Journal of Iron and Steel Research(International) 2010年第12期17卷 59-64页

作者： LIU Xiao YANG Ji-chun YANG Lin GAO Xue-zhong Metallurgy Department Central Iron and Steel Research Institute Beijing 100081 China Materials and Metallurgy School Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China Engineering and Technology Division Advanced Technology and Materials Limited Company Beijing 100081 China The First Steelmaking Plant Angang Steel Company Limited Anshan 114021 Liaoning China

The effect of Ce on inclusions and impact toughness of 2Cr13 stainless steel were studied by SEM and electron spectroscopy. Thermodynamic calculation was used to analyze the formation of RE inclusions in 2Cr13 stainless steel. The result shows that Al2 O3 and MnS can be entirely replaced by Ce2 O2 S and CeS. Fracture is changed from cleavage to ductile fracture by adding Ce to the 2Cr13 stainless steel, and the spherical rare earth oxysulfide inclusions （Ce2 O2 S） in the dimple are the main factors. The transverse impact value of 2Cr13 stainless steel has been improved obviously by Ce. The transverse impact value of RE-2Cr13 is increased by 54.55% at the temperature of --40℃, comparing with 0RE-2Cr13.

关键词： rare earth 2Cr13 stainless steel inclusion thermodynamic calculation impact property

Effects of Nb Addition on Charpy impact Properties of TiVTa Refractory High‑Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 405-416页

作者： Xue Yin Yan‑Kun Dou Xin‑Fu He Ke Jin Cheng‑Long Wang Ya‑Guang Dong Cun‑Yong Wang Yun‑Fei Xue Wen Yang Department of Reactor Engineering Technology Research China Institute of Atomic EnergyBeijing 102413China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advance Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

In the present study,the effects of Nb addition on Charpy impact properties of TiVTa refractory high-entropy alloy with high strength-ductility trade-off were systematically studied by using the instrumented Charpy impact testing machine.The experimental results showed that the impact toughness was remarkably improved by Nb addition in TiVTa to form TiVTaNb alloy.The crack initiation energy and propagation energy of TiVTaNb were 67.3%and 24.9%higher than that of TiVTa,indicating that Nb addition simultaneously reinforced the resistance to crack initiation and propagation.The impact fracture of TiVTaNb exhibited larger bending degree of shear lips,deeper dimples and more secondary cracks which effectively dissipated more impact energy.The deformation mechanism of TiVTa alloy was dominated by dislocation activities.While in TiVTaNb,the deformation mechanism was synergized by dislocation activities and deformation twinning,which were the main contributors for the improved impact properties and the stronger crack resistance of TiVTaNb alloy under impact loading.

关键词： Refractory high-entropy alloys Nb addition impact property Crack resistance Deformation mechanism

Effect of multiple heat treatments on fracture property of centrifugal casting stainless steels Z3CN20.09M with long-term thermal aging degradation

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Journal of Iron and Steel Research(International) 2021年第2期28卷 223-231页

作者： Min-yu Fan Wen-qing Jia Wei-wei Yu Dong-ying Wang Meng Guan Yu Cao Fei Xue Yin-li Liu Jing-wen Yao Bin Lin Ting Yu Suzhou Nuclear Power Research Institute Suzhou 215004JiangsuChina Shenyang Blower Works Group Nuclear Pump Co. Ltd.Shenyang 110869LiaoningChina

It is of great significance to investigate effect of multiple heat treatments on fracture property of centrifugal casting stainless steels Z3CN20.09M cut from pump casing with long-term thermal aging degradation for nuclear power plants to consider actual operation of nuclear power plants.Both multiple heat treatments and accelerated thermal aging experiment at the same temperature of 400℃ for different time were successively carried out on centrifugal casting stainless steels Z3CN20.09M in order to examine the metallographic modification and impact properties.Finally,an additional investigation on the related fracture properties was carried out,in which the critical initial fracture toughness Ji was determined by stretch zone width and 0.2 mm offset line methods.These results indicated that the multiple heat treatments led to the dispersed distribution of ferrite phases in austenite matrix and thus microhardness increased,but impact energy exhibited a decreasing tendency significantly.After long-term aging,the metallographic structure remained almost unchanged,but the size of ferrite phases showed a slight increasing trend because of spinodal decomposition in ferrite phases and G-phase precipitation.In addition,centrifugal casting stainless steels Z3CN20.09M with multiple heat treatments exhibited the higher microhardness,Charpy impact toughness,critical initial fracture toughness J_(IC)(J-integral determined by 0.2 mm offset line method),and J_(SZW)(J-integral determined by stretch zone width method)than those with primary heat treatment,while the specific number of the heat treatment had a low influence on fracture toughness.

关键词： Multiple heat treatment Z3CN20.09M cast stainless steel impact property Fracture toughness Long-term thermal aging

Effect of Welding Processes on Tensile and impact Properties,Hardness and Microstructure of AISI 409M Ferritic Stainless Joints Fabricated by Duplex Stainless Steel Filler Metal

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Journal of Iron and Steel Research(International) 2009年第5期16卷 66-72页

作者： A K Lakshminarayanan K Shanmugam V Balasubramanian Centre for Materials Joining and Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai University

The effect of welding processes such as shielded metal arc welding, gas metal arc welding and gas tungsten arc welding on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade is studied. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the welded joints have been evaluated and the results are compared. From this investigatio.n, it is found that gas tungsten arc welded joints of ferritic stainless steel have superior tensile and impact properties compared with shielded metal arc and gas metal arc welded joints and this is mainly due to the presence of finer grains in fusion zone and heat affected zone.

关键词： ferritic stainless steel shielded metal arc welding gas metal arc welding gas tungsten arc welding tensile impact property

Effect of Autogenous Arc Welding Processes on Tensile and impact Properties of Ferritic Stainless Steel Joints

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Journal of Iron and Steel Research(International) 2009年第1期16卷 62-68,16页

作者： A K Lakshminarayanan K Shanmugam V Balasubramanian Centre of Materials Joining and Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608002Tamil NaduIndia

The effect of autogeneous arc welding processes on tensile and impact properties of ferritic stainless steel conformed to AISI 409M grade is studied. Rolled plates of 4 mm thickness have been used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure, and fracture surface morphology of continuous current gas tungsten arc welding （CCGTAW）, pulsed current gas tungsten arc welding （PCGTAW）, and plasma arc welding （PAW） joints are evaluated and the results are compared. It is found that the PAW joints of ferritic stainless steel show superior tensile and impact properties when compared with CCG-TAW and PCGTAW joints, and this is mainly due to lower heat input, finer fusion zone grain diameter, and higher fusion zone hardness.

关键词： ferritic stainless steel plasma arc welding continuous current gas tungsten arc welding pulsed currentgas tungsten arc welding tensile property impact property

Evaluation of Microstructure and Mechanical Properties of Laser Beam Welded AISI 409M Grade Ferritic Stainless Steel

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Journal of Iron and Steel Research(International) 2012年第1期19卷 72-78页

作者： A K Lakshminarayanan V Balasubramanian Department of Manufacturing Engineering Annamalai University

The microstructure analysis and mechanical properties evaluation of laser beam welded AISI 409M ferritic stainless steel joints are investigated. Single pass autogeneous welds free of volumetric defects were produced at a welding speed of 3 000 mm/min. The joints were subjected to optical microscope, scanning electron fractographe, microhardness, transverse and longitudinal tensile, bend and charpy impact toughness testing. The coarse ferrite grains in the base metal were changed into dendritic grains as a result of rapid solidification of laser beam welds. Tensile testing indicates overmatching of the weld metal is relative to the base metal. The joints also exhibited acceptable impact toughness and bend strength properties.

关键词： laser beam welding ferritic stainless steel tensile property impact property

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硬质聚氨酯泡沫塑料增强技术研究

硬质聚氨酯泡沫塑料增强技术研究

2006年全国高分子材料科学与工程研讨会

作者：周秋明王建华田春蓉芦艾中国工程物理研究院化工材料研究所中国工程物理研究院化工材料研究所中国工程物理研究院化工材料研究所中国工程物理研究院化工材料研究所

＜正＞硬质聚氨酯泡沫塑料（RPUF）具有比强度、比模量高、易成型的优点,作为结构材料在许多领域得到了广泛应用。为了进一步提高RPUF的力学性能,开展了增强硬质聚氨酯泡沫塑料的增强技术研究。分别采用短切玻璃纤维、空心玻璃微珠和长... 详细信息

＜正＞硬质聚氨酯泡沫塑料（RPUF）具有比强度、比模量高、易成型的优点,作为结构材料在许多领域得到了广泛应用。为了进一步提高RPUF的力学性能,开展了增强硬质聚氨酯泡沫塑料的增强技术研究。分别采用短切玻璃纤维、空心玻璃微珠和长玻璃纤维对RPUF进行了增强研究。另外, 通过控制异相成核技术,研究了RPUF泡孔向微细化方向发展的技术途径及性能变化规律, 即在实验过程中,分别在RPUF基体中引入少量不同尺寸、不同结构的异相成核剂,并选择

关键词： polyurethane foam plastic glass fiber hollow glass bead compression property impact property

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微纤改性硬质聚氨酯泡沫塑料的研究

微纤改性硬质聚氨酯泡沫塑料的研究