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A multi-scale grained microstructure of the surface nanocrystallized 304 stainless steel sheets after warm-rolling

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Baosteel Technical Research 2010年第4期4卷 13-16页

作者： CHEN Aiying1)and ZHANG Junbao2)1)Shanghai Institute of Technology,Shanghai 200235,China2)Advanced Technology Division,Research Institute,Baoshan Iron & steel Co.,Ltd.,Shanghai 201900,China Shanghai Institute of Technology Shanghai 200235 China Advanced Technology Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

An ultrafine grained microstructure was obtained for 304 stainless steel(304SS)sheets by using surface nanocrystallization and *** microstructure and mechanical properties were determined by X-ray diffraction(XRD),transmission electron microscope(TEM)and a test on *** results were shown that the microstructure was featured by a continuous distribution from the nanocrystalline on the surface to micro-grains in the center,in which the volume fraction of the micro-sized grains is about 40% in the surface *** multi-scale grained microstructure was composed of austenite and martensite phases with a gradient increasing volume fraction of austenite from the surface to the *** microhardness of the resultant steel was higher than 150% of that as received,due to the refined grains and strain-induced martensitic *** hardness distribution was consistent with the microstructural variation,suggesting a good combination of high strength and improved ductility.

关键词： multi-scale grained microstructure surface mechanical attrition treatment warm-rolling 304 stainless steel mechanical property

An Approach for Full-Range True Stress-Strain Curves of 304 stainless steel Using Funnel-Type Specimens

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An Approach for Full-Range True Stress-Strain Curves of 304 ...

Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic stainless steel

2012年海峡两岸破坏科学/材料试验学术会议

作者： Di Yao Lixun Cai School of Mechanics and Engineering Southwest Jiaotong University

The description of constitutive relationship of materials up to failure is very significant for structure damage and large displacement *** paper presents a new method to determine the full-range uniaxial constitutive relationship of 304 stainless steel by the tensile tests of the funnel specimens with small curvature *** command stream program of ANSYS is developed to achieve the conduction of true constitutive relationship based on digital image *** finite element simulation(FES) results for the funnel specimens show that,the simulative load versus displacement curve,diameter at the funnel root versus displacement curve and funnel deformation contours are closed to the testing *** addition,the stress and strain for 304 stainless steel when the specimens failed are given.

关键词： Funnel Specimen Uniaxial Tension Finite Element Simulation Constitutive Relationship 304 stainless steel

来源： cnki会议评论

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cnki会议

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Chinese Journal of Chemical Engineering 2008年第2期16卷 314-319页

作者：吕国诚程海东许淳淳何宗虎 College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Chemical Biomedical and Materials Engineering Stevens Institute of Technology Hoboken NewJersey 07030 USA

The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain. The impact factor fc was brought forward to value the effect of strain on pitting. The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%, 10%, and 30% were investigated. Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density. The results indicated that fc increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg.L . Under the three levels of strain mentioned above, when chloride concentration was below 463 mg.L^-1,121 mg.L^-1, and 98 mg.L^-1 respectively, the pitting potential shifted towards positivity and, the passive film became more stable. When the strain was below 10%, the pitting susceptibility of type 304 stainless steel varied greatly as strain increased, whereas the susceptibility only changed a little when the strain was over 10%.

关键词： 304 stainless steel strain pitting corrosion chloride concentration

Microstructure and mechanical properties of laser welded joints of pure copper and 304 stainless steels

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China Welding 2014年第3期23卷 69-72页

作者：王刚吴林志黄建茌冯吉才 State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001. Center for Composite Materials Harbin Institute of Technology Harbin Institute of Technology Harbin150001.

A continuous wave diode laser with an output power of 2.8 kW was used to join pure copper and 304 stainless steel with a thickness of 1 mm. The focused laser beam with a diameter of O. 8 mm was irradiated on the copper side of the butt joints. In process of laser welding, effects of processing primary parameters on tensile strength of the joints were investigated. The interfacial characterizations of the joints were investigated by metallographic microscope, scanning electron microscope （SEM） and energy dispersive X-ray spectroscope （EDS）. The results showed that the element diffusion and solution occur and metallurgical bonding was achieved between pure copper and 304 stainless steel. The maximum tensile strength of the joints was 209 MPa when the laser power of welding was 2. 4 kW and welding speed was 12 mm/s.

关键词： laser welding microstructure properties pure copper 304 stainless steel

Wear and corrosion resistance of CoCrNi composite coatings by laser cladding

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China Foundry 2022年第6期19卷 535-543页

作者： Di Jiang Hong-zhi Cui Xiao-jie Song Xiao-juan Lian Xiao-feng Zhao Hao Chen Guo-liang Ma School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Two kinds of CoCrNi composite coatings,CoCrNiMo and CoCrNiMoBC,were prepared by laser cladding on the base metal of 304 stainless *** wear and corrosion properties of the coatings were studied by wear tests and electrochemical *** show that the addition of B_(4)C promotes the generation of the ceramic phase,and therefore improving the microhardness of the coating and enhancing its wear resistance,while simutaneously keeps its excellent corrosion *** dispersive X-ray spectrometry analysis shows that the chromium distribution in the two coatings is relatively uniform,which is beneficial for corrosion *** Kelvin probe microscopy results reveal that the potential difference between dendrites and interdendrites is only 20 mV,which leads to a relatively low driving force for galvanic *** through the atomic-scale high-resolution transmission electron microscopy shows that the fundamental reason for the high wear and corrosion resistance of the coating is the excellent coherent interface between the two phases,which reduces the interface energy and potential difference and thus improving its corrosion resistance.

关键词： wear corrosion laser cladding coherent boundary 304 stainless steel

Preparation and Properties of Triazine DithiolSilane Composite Self-assembled hydrophobility Films on stainless steel surfaces

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Preparation and Properties of Triazine DithiolSilane Composi...