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首页> 外文期刊>ISIJ international >Solidification Structures of Fe-Cr-Ni-Mo-N Super-austenitic Stainless Steel Processed by Twin-roll Strip Casting and Ingot Casting and Their Segregation Evolution Behaviors
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Solidification Structures of Fe-Cr-Ni-Mo-N Super-austenitic Stainless Steel Processed by Twin-roll Strip Casting and Ingot Casting and Their Segregation Evolution Behaviors

机译：双辊薄带连铸和铸锭加工的Fe-Cr-Ni-Mo-N超奥氏体不锈钢的凝固组织及其偏析行为

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摘要

Fe-Cr-Ni-Mo-N super-austenitic stainless steels were processed by using twin-roll strip casting and ingot casting, and their solidification structures and segregation behaviors were comparatively studied. The results show that serious center macro-segregation and massive eutectics were detected in ingot, with the amount of eutectics being increased from surface to center. By contrast, macro-segregation and eutectics were inhibited in cast strip (CS) due to its rapid cooling rate during the solidification process. In order to obtain optimum hot workability, homogenization treatments were carried out in the temperature range from 1 050 to 1 200℃ for different time from 30 to 480 min in CS and ingot. The results show that the homogenized temperature of CS should be higher than 1 100℃ to avoid the formation of precipitates, and the optimum homogenization process was 1 150-1 200℃ for 30 min. For the ingot homogenized at 1 200℃, eutectics gradually dissolved into the matrix with increasing the homogenization time, and after 4 hours, they completely dissolved. Ingot could be homogenized after more than 8 hours of homogenization, indicating that CS has intrinsic advantages in homogenization. Finally, mechanical property and pitting corrosion resistance of 1 mm-thick cold-rolled bands, fabricated from CS and ingot, were tested and compared. The results show that the overall performance of cold-rolled bands of CS was superior to that of ingot.
机译：Fe-Cr-Ni-Mo-N超级奥氏体不锈钢分别采用双辊薄带连铸和铸锭工艺进行了加工，并对其凝固组织和偏析行为进行了比较研究。结果表明，在铸锭中检测到严重的中心宏观偏析和块状共晶，共晶量从表面到中心增加。相比之下，铸造带材（CS）的宏观偏析和共晶由于凝固过程中的快速冷却速度而受到抑制。为了获得最佳的热加工性能，在CS和铸锭中在1050至1200℃的温度范围内进行了30至480分钟的不同时间的均质处理。结果表明，CS的均质温度应高于1100℃，以防止沉淀的形成，最佳均质工艺为1 150-1 200℃，保持30min。对于在1200℃下均质化的铸锭，随着均质化时间的增加，共晶物逐渐溶解于基体中，并在4小时后完全溶解。均质超过8小时后，锭料可以均质化，这表明CS在均质化方面具有固有优势。最后，测试和比较了由CS和铸锭制成的厚度为1 mm的冷轧带材的机械性能和耐点蚀性。结果表明，冷轧带钢的整体性能优于铸锭。

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  • 来源
    《ISIJ international》 |2018年第10期|1801-1810|共10页
  • 作者

  • 作者单位

    State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 PR China;

    State Key Lab for Rolling Technologies and Automation Northeastern University Shenyang Liaoning Province 110819 PR China;

    School of Materials Science and Engineering Northeastern University Shenyang 110004 PR 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solidification behavior; segregation behavior; homogenization treatment; twin-roll strip cast-ing; super austenitic stainless steel;

    机译：凝固行为隔离行为;均质化处理;双辊带钢连铸;超级奥氏体不锈钢;

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