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

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页码：386 / 397

页数：12

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