科研之友
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摘要
Early studies have been conducted on the friction stir welding of steel, tungsten (W), molybdenum (Mo), tungsten carbide, and the like for the production of tools, but the tool materials were significantly worn out and deformed while they were being joined. So far, the polycrystalline cubic boron nitride (PCBN) tool, which is very strong at high temperatures and is wear-resistant, has performed relatively well, but the improvement of its productivity is limited by its high manufacturing cost. In this study, 1.4 mm-thick DP590 steel was subjected to FSW using the ceramic material of a Si3N4 tool. The main process parameters of the butt joint at rotation speeds of 600-1,000 rpm and traveling speeds of 180-300 mm/min were determined through the bead-on-plate experiment. Also, the tensile strength, hardness, and Charpy impact properties of each FSW joint were evaluated, the full extent of the wear was measured and the tool life of the PCBN tool that was about four times as costly to produce was compared with the maximum joint length to determine the durability of the tool.
- 出版日期2014-10
