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metallographic structure analysis of DC pulsed SAW joint

China Welding 2007年第4期16卷 47-50页

作者：杜乃成胡绳荪李桓隋永莉陈宇 School of Materials Science and Engineering Tianjin University Pipeline Research Institute of CNPC

Submerged arc welding （SAW） has shortcoming of over heat input, which increases grain size in heat-affected zone （ HAZ） and decreases welding quality and mechanical properties of the joints serioasly. With improvements of welding equipment, direct current （ DC） pulsed SAW （ PSAW） was utilized successfully in the research. Comparing DC PSAW with DC common SAW （ CSAW） , the metallographic structure was analyzed with optical and electron microscope, the width of HAZ was measured as well as the width and hardness of the coarse grained HAZ （CGHAZ）. The research shows that DC PSAW joint had higher welding penetration, narrower HAZ and CGHAZ, which benefited HAZ performance and welding quality.

关键词： pulse submerged arc welding metallographic structure

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Fracture behavior and mechanism of highly fragmented steel cylindrical shell under explosive loading

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Defence Technology（防务技术） 2024年第6期36卷 122-132页

作者： Kang Wang Peng Chen Xingyun Sun Yufeng Liu Jiayu Meng Xiaoyuan Li Xiongwei Zheng Chuan Xiao Xi'an Modern Chemistry Research Institute Xi'an 710065China Shanxi Jiangyang Chemical Company Limited Taiyuan 030051China Central Iron&Steel Research Institute Company Limited Beijing 100081China China Research and Development Academy of Machinery Equipment Beijing 100089China

An in-depth understanding of the fracture behavior and mechanism of metallic shells under internal explosive loading can help develop material designs for warheads and regulate the quantity and mass distribution of the fragments *** study investigated the fragmentation performance of a new high-carbon silicon-manganese(HCSiMn)steel cylindrical shell through fragment recovery *** with the conventional 45Cr steel shell,the number of small mass fragments produced by the HCSi Mn steel shell was significantly increased with a scale parameter of 0.57 g fitted by the Weibull distribution *** fragmentation process of the HCSi Mn shell exhibited more brittle tensile fracture characteristics,with the microcrack damage zone on the outer surface being the direct cause of its high *** the one hand,the doping of alloy elements resulted in grain refinement by forming metallographic structure of tempered sorbite,so that microscopic intergranular fracture reduces the characteristic mass of the fragments;on the other hand,the distribution of alloy carbides can exert a"pinning"effect on the substrate grains,causing more initial cracks to form and propagate along the brittle carbides,further improving the shell *** the killing power radius for light armored vehicles was slightly reduced by about 6%,the dense killing radius of HCSiMn steel projectile against personnel can be significantly increased by about 26%based on theoretical *** results provided an experimental basis for high fragmentation warhead design,and to some extent,revealed the correlation mechanism between metallographic structure and shell fragmentation.

关键词： Projectile fragmentation Fragment mass distribution Fracture mode metallographic structure Damage power

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