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贾坤宁, 赵洪运, 高彩茹, 王国栋. 微钙钢焊后显微组织中的粒状贝氏体对韧性的影响[J]. 焊接学报, 2007, (2): 95-98.
引用本文: 贾坤宁, 赵洪运, 高彩茹, 王国栋. 微钙钢焊后显微组织中的粒状贝氏体对韧性的影响[J]. 焊接学报, 2007, (2): 95-98.
JIA Kunning, ZHAO Hongyun, GAO Cairu, WANG Guodong. Effect of granular bainite in microstructure after welding on impact toughness for micro-calcium steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (2): 95-98.
Citation: JIA Kunning, ZHAO Hongyun, GAO Cairu, WANG Guodong. Effect of granular bainite in microstructure after welding on impact toughness for micro-calcium steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (2): 95-98.

微钙钢焊后显微组织中的粒状贝氏体对韧性的影响

Effect of granular bainite in microstructure after welding on impact toughness for micro-calcium steel

  • 摘要: 研究了焊接热模拟工艺参数t8/5对微钙钢焊接粗晶热影响区(CGHAZ)显微组织和冲击韧度的影响。利用Lepera试剂腐蚀法,采用光学金相显微镜、透射电子显微镜分析了不同t8/5条件下粒状贝氏体中M-A组元的形态及分布特征。研究结果表明当冷却速度较快时,M-A组元主要以长条状、呈方向性分布;当冷却速度降低时,M-A组元逐渐变成颗粒状,并失去方向性;当t8/5=40 s时,韧性较好。

     

    Abstract: The effects of technology parameters of simulated welding thermal cycle(cooling time t8/5)on microstructures and impact toughness of CGHAZ in micro-colcium steel were studied.The M-A constituents in granular bainite were etched by Lepera reagent.The pattern, quantity and distribution of M -A constituents with different t8/5 were studied in optical microscope and TEM.The research shows that when the cooling rate is lower the M-A constituents are bacillary and directional, when the cooling rate is higher the M-A constituents are granular and direction-free.When t8/5=40 s the impact toughness is better than other cooling time.

     

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