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首页> 外文期刊>Journal of Materials Research >Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas
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Dramatically enhanced impact toughness in welded ultra-ferritic stainless steel by additional nitrogen gas in Ar-based shielding gas

机译：通过在Ar基保护气体中添加氮气显着提高焊接超铁素体不锈钢的冲击韧性

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摘要

The effect of nitrogen gas addition in Ar-based double-layer shielding gas on the impact toughness of welded ultra-ferritic stainless steel during an autogenous gas tungsten arc welding (GTAW) process was investigated. The nitrogen behavior was proposed. The microstructure, mechanical properties, and fracture surface morphology of the weld metals have been evaluated. More equiaxed crystals, refined grain, narrow HAZ width, and increased microhardness were produced with nitrogen addition. Experimental findings indicated that nitrogen diffused into HAZ and dissolved into weld pool. The solute distribution was changed thus bringing significant constitutional supercooling and decreased temperature gradient of weld pool, which contributed to fine microstructure. Impact toughness at room temperature was enhanced from 2J to 9J (welds), 5J-13J (HAZ). Ductile fracture zone was produced about 0.3-0.5 mm thickness distance from the weld surface. A significant increased impact toughness of weld metal was due to the refinement of microstructure and element addition.
机译：研究了氩气氩弧焊（GTAW）过程中在氩基双层保护气体中添加氮气对焊接超铁素体不锈钢冲击韧性的影响。提出了氮行为。已经评估了焊接金属的微观结构，力学性能和断裂表面形态。加入氮后，会产生更多等轴晶体，细化晶粒，窄的热影响区宽度和更高的显微硬度。实验结果表明，氮扩散到热影响区并溶解到焊缝中。溶质分布发生了变化，从而带来了显着的组织过冷并降低了熔池的温度梯度，这有助于形成精细的组织。室温下的冲击韧性从2J提高到9J（焊缝），从5J-13J（HAZ）提高。距焊接表面约0.3-0.5 mm的厚度产生延性断裂区。焊缝金属冲击韧性的显着提高是由于微结构和元素添加的改进。

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  • 来源
    《Journal of Materials Research》 |2016年第22期|3610-3618|共9页
  • 作者

    Heng Li; Wenqing Xing; Xinye Yu; Wei Zuo; Le Ma; Peng Dong; Wenxian Wang; Guangwei Fan; Jie Lian; Min Ding;

  • 作者单位

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China;

    Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China;

    Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China Technology Center, Taiyuan Iron and Steel (Group) Company Limited, 030003 Taiyuan, China;

    College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, Shanxi Province, China Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, Shanxi Province, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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