• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Variation in Morphology and Kinetics of Granular Bainite with Welding Thermal Cycles in High-Nb Fire-Resistant Steel: Experiments and Theoretical Calculations
【24h】

Variation in Morphology and Kinetics of Granular Bainite with Welding Thermal Cycles in High-Nb Fire-Resistant Steel: Experiments and Theoretical Calculations

机译：高NB耐火钢焊接热循环的粒状贝氏体形态和动力学的变化：实验与理论计算

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The microstructure and kinetics of granular bainite (GB) were investigated in novel fire-resistant steel containing high niobium and subjected to simulated welding thermal cycles. The dilatometric data were analyzed to determine the activation energy and Avrami exponents. It was observed that austenite transformed to GB over a wide range cooling rates of 0.5-100K/s. Theoretical calculations indicated that Avrami exponent (n) decreased with increased transformed volume fraction (fb) and cooling rate. At a moderate cooling rate of 20-6K/s, bainitic ferrite as sheaves formed from austenite and the corresponding Avrami exponent was 2n3. Martensite in martensite/austenite constituent formed with Avrami exponent n similar to 1. At the fastest cooling rate of 50K/s, lath bainitic ferrite and film-like retained austenite (RA) were obtained with the corresponding Avrami exponent n similar to 1. At lower cooling of 1 and 0.5K/s, plate-like bainitic ferrite and block-like microphase composed of lamellar RA and ferrite were obtained with Avrami exponent n3. The local activation energy for austenite transformation to bainitic ferrite decreased from similar to 198 to similar to 182kJ/mol with increasing fb from 0.05 to 0.95, while the local activation energy for austenite transformation to martensite decreased from similar to 80 to similar to 71kJ/mol with increasing fb from 0.05 to 0.95.
机译：粒状贝氏体（GB）的微观结构和动力学在含有高铌的新型抗火钢中进行研究，并进行模拟焊接热循环。分析稀释数据以确定激活能量和AVRAMI指数。观察到奥氏体在0.5-100K / s的宽范围冷却速率下转化为GB。理论计算表明，AVRAMI指数（N）随着变化的体积分数（FB）和冷却速率而降低。以20-6k / s的中等冷却速率，贝氏体铁氧体作为由奥氏体形成的叶片，相应的Avrami指数为2＆ n 3。与Avrami指数n形成的马氏体/奥氏体成分中的马氏体类似于50k / s的最快冷却速率，使用相应的AVRAMI指数N获得Lath Bainition铁氧体和薄膜状保留的奥氏体（Ra）。通过Avrami指数N＆GT; 3获得较低冷却1和0.5k / s，板状贝氏体铁氧体和由层状Ra和铁素体组成的嵌段噬粒组成。奥氏体转化对贝氏体铁氧体的局部激活能量从198类似的相似，与0.05至0.95的增加，奥氏体转化的局部活化能从类似于71kJ / mol的局部激活能量降低。随着0.05至0.95的增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号