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首页> 外文会议>Symposium on Characterization of Minerals, Metals, and Materials >Effect of Thermal Aging on Impact Toughness of Electron Beam-Welded AISI 316 Stainless Steel
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Effect of Thermal Aging on Impact Toughness of Electron Beam-Welded AISI 316 Stainless Steel

机译：热时效对电子束焊接AISI 316不锈钢冲击韧性的影响

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摘要

Thick section of cold-rolled austenite stainless steel AISI 316 is widely used in heat exchangers, jet engines, furnace parts, exhaust manifolds, fast breeder test rector, etc., because of its high strength, corrosion, and pitting resistance properties at high working temperature 400-550 °C approximately. Electron beam welding is considered as highly efficient welding process in order to achieve high-quality welds with low heat-affected zone. In this paper, single-pass narrow gap square butt welding of 18-mm-thick plates using electron beam welding at constant accelerating voltage 150 kV, beam current 90 mA, welding travel speed 600 mm/min, and beam oscillation in circular pattern was investigated. The impact toughness and metallurgical properties in as-welded condition and after imparting post-weld thermal aging (PWTA) at 750 °C for 24 h were also investigated in this piece of work. The full penetration had been achieved in single pass by optimizing the relationship between welding parameters (beam accelerating voltage, beam current, welding travel speed, and beam oscillation). The results showed that welding of plates without filler metal leads to defect-free welds. The average impact toughness conducted by Charpy impact test at cryogenic temperature (-40 °C) in as-welded samples was recorded as 284 J, and after aged at 750 °C for 24 h it reduced to 180 J.
机译：厚截面冷轧奥氏体不锈钢AISI 316广泛用于热交换器、喷气发动机、熔炉零件、排气歧管、快速增殖试验容器等，因为其在大约400-550°C的高温工作温度下具有高强度、耐腐蚀和抗点蚀性能。电子束焊接被认为是一种高效的焊接工艺，其目的是获得低热影响区的高质量焊缝。本文研究了在恒定加速电压150kv，束流90ma，焊接速度600mm/min，束流振荡的条件下，18mm厚板材的单道窄间隙方对接电子束焊接。在这项工作中，还研究了焊接状态下以及在750°C下进行焊后热时效（PWTA）24小时后的冲击韧性和冶金性能。通过优化焊接参数（束流加速电压、束流、焊接速度和束流振荡）之间的关系，实现了单道次全熔透。结果表明，无填充金属的板材焊接可获得无缺陷焊缝。通过低温（-40°C）下夏比冲击试验对焊接试样进行的平均冲击韧性记录为284 J，在750°C下时效24小时后，其降低至180 J。

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