DEVELOPMENT OF MACROSTRUCTURE AND MICROSTRUCTURE OF CARBON-MANGANESE LOW-ALLOY STEEL WELDS - INCLUSION FORMATION

被引:120
作者
BABU, SS [1 ]
DAVID, SA [1 ]
VITEK, JM [1 ]
MUNDRA, K [1 ]
DEBROY, T [1 ]
机构
[1] PENN STATE UNIV, DEPT MAT SCI & ENGN, UNIVERSITY PK, PA 16802 USA
关键词
D O I
10.1179/mst.1995.11.2.186
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ladle steel deoxidation reactions are reviewed and the principles are extended to inclusion formation in steel weld metal. The dissolution of oxygen, the stability of various oxides, and the nucleation and growth of inclusions are discussed. Theoretical time-temperature transformation (TTT) diagrams are calculated for various oxide inclusions based on an overall kinetics approach using nucleation and growth rare expressions. These concepts are then extended to understand the development of weld metal inclusion characteristics. A strong correlation between the published inclusion composition and the stability of the oxides was found. An analysis of the TTT diagrams indicates that, during weld cooling, sequential oxidation of dissolved deoxidising elements takes place, which agrees with the reported layered morphology of inclusions. The analysis indicates that the inclusion characteristics are quite sensitive to the oxygen content, the deoxidising element concent rations, the presence of performed inclusions, and the reaction temperature. Inclusion coarsening and elimination of inclusions from welds are discussed in relation to the final inclusion characteristics.
引用
收藏
页码:186 / 199
页数:14
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