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李亚江, 王娟, 周冰. P91耐热钢焊接区的微观组织结构分析[J]. 焊接学报, 2003, (2): 39-43.
引用本文: 李亚江, 王娟, 周冰. P91耐热钢焊接区的微观组织结构分析[J]. 焊接学报, 2003, (2): 39-43.
LI Ya jiang, WANG Juan, ZHOU Bing. TEM analysis of microstructure in welding zone of P91 heat-resis-tant steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2003, (2): 39-43.
Citation: LI Ya jiang, WANG Juan, ZHOU Bing. TEM analysis of microstructure in welding zone of P91 heat-resis-tant steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2003, (2): 39-43.

P91耐热钢焊接区的微观组织结构分析

TEM analysis of microstructure in welding zone of P91 heat-resis-tant steel

  • 摘要: 采用扫描电镜(SEM)、X射线衍射(XRD)和透射电镜(TEM)等,对钨极氩弧焊(TIGW)打底+手工电弧焊(SMAW)盖面焊接工艺条件下规格为φ234mm×26mm的P91耐热钢焊接区的显微组织结构进行了研究。试验结果表明,TIG焊线能量为8.5~11.7kJ/cm、SMAW线能量为13.3~21.0kJ/cm时,焊缝金属的显微组织由奥氏体+少量铁素体组成,奥氏体中的亚结构为成一定夹角的隐晶板条马氏体,在马氏体基体上存在有弥散分布的点状析出物,并经透射电镜分析的结果所证实。在板条马氏体的晶界和晶内有弥散分布的M23C6碳化物(晶格常数1.064nm),这些碳化物大多为Cr23C6

     

    Abstract: Uner the condition of tungsten-inert-gas (TIG) welding+shielded metal arc welding (SMAW) technology,the microstructure in the welding zone of P91 heat-resisant steel is researched by means of SEM,X-ray diffractometry (XRD) and TEM.The size of the test piece is φ234 mm×26 mm.The test results indicate that when the heat input (E) of TIG welding is 8.5~11.7 kJ/cm and the heat input of SMAW is 13.3~21.0 kJ/cm,the microstructure in the weld metal is composed of austenite and a little amount of ferrite.The sub-structure of austenite is crypto-crystal lath martensite,which has included regular angle.There were some spot precipitates in the martensite base which was confirmed by TEM analysis.There are some carbide (lattice constant is 1.064 nm) at the boundary of grain and inside the grain,most of which is Cr23C6.

     

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