NDLI: Mechanism of microstructural deterioration preceding type IV failure in weldment of Mod.9Cr-1Mo steel

Content Provider	Springer Nature Link
Author	Lee, J. S. Maruyama, K.
Copyright Year	2015
Abstract	The objective of the present study was to elucidate the cavity formation mechanism of Type IV failure in weldment of advanced high-Cr ferritic steels. A welded joint of Mod.9Cr-1Mo steel was creep tested at 650 °C under 83 MPa. The creep fracture mode was Type IV failure in the heat affect zone (HAZ). Microstructural characterization of the HAZ and the fracture location, were performed before and after the creep test. The Type IV cracking started in the inter-critical HAZ at a location having fine grain size and coarse M$_{23}$C$_{6}$ precipitates. Moreover, the grain structure of the inter-critical HAZ, which is a mixture of soft α and hard α’ grains, plays an important role in the stage of cavity evolution into a crack along the grain boundary. This is due to the heterogeneity of local strain between the two kinds of grains. By a synergistic effect of the strain concentration, the coarse precipitates and heterogeneous strain distribution among grains in the inter critical HAZ, facilitates the nucleation and growth of creep cavities, resulting in premature failure of welded joints.
Starting Page	639
Ending Page	645
Page Count	7
File Format	PDF
ISSN	15989623
Journal	Metals and Materials
Volume Number	21
Issue Number	4
e-ISSN	20054149
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2015-06-18
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	alloy creep embrittlement fracture microstructure Metallic Materials Operating Procedures, Materials Treatment Magnetism, Magnetic Materials Engineering Thermodynamics, Heat and Mass Transfer Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Mechanics of Materials Metals and Alloys Condensed Matter Physics

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