Type IV Cracking Susceptibility in Weld Joints of Different Grades of Cr-Mo Ferritic Steel

被引：64
|
作者：
Laha, K. [1 ]
Chandravathi, K. S. [1 ]
Parameswaran, P. [1 ]
Rao, K. Bhanu Sankara [1 ]
机构：
[1] Indira Gandhi Ctr Atom Res, Met & Mat Grp, Kalpakkam 603102, Tamil Nadu, India
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 02期
关键词：
CREEP-RUPTURE STRENGTH; PREDICTION; FRACTURE;
D O I：
10.1007/s11661-008-9724-x
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Relative type-IV cracking susceptibility in 2.25Cr-1Mo, 9Cr-1Mo, and 9Cr-1MoVNb ferritic steel weld joint has been assessed. The type-IV cracking was manifested as preferential accumulation of creep deformation and cavitation in the relatively soft intercritical region of heat affected zone of the weld joint. The type-IV cracking susceptibility has been defined as the reduction in creep-rupture strength of weld joint compared to its base metal. The 2.25Cr-1Mo steel exhibited more susceptibility to type-IV cracking at relatively lower temperatures; whereas, at higher temperatures, 9Cr-1MoVNb steel was more susceptible. The relative susceptibility to type-IV cracking in the weld joint of the Cr-Mo steels has been rationalized on the basis of creep-strengthening mechanisms operating in the steels and their venerability to change on intercritical heating during weld thermal cycle, subsequent postweld heat treatment, and creep exposure.
引用
收藏
页码：386 / 397
页数：12
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