ANALYSIS OF SOLIDIFICATION MICROSTRUCTURES IN FE-NI-CR SINGLE-CRYSTAL WELDS

被引:241
作者
RAPPAZ, M
DAVID, SA
VITEK, JM
BOATNER, LA
机构
[1] OAK RIDGE NATL LAB,DIV MET & CERAM,MAT JOINING GRP,OAK RIDGE,TN 37831
[2] OAK RIDGE NATL LAB,DIV MET & CERAM,MICROSCOPY & MICROANALYT SCI GRP,OAK RIDGE,TN 37831
[3] OAK RIDGE NATL LAB,DIV SOLID STATE,CERAM & INTERFACES SECT,OAK RIDGE,TN 37831
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1990年 / 21卷 / 06期
关键词
D O I
10.1007/BF02672593
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A geometric analysis technique for the evaluation of the microstructures in autogenous single-crystal electron beam welds has been previously developed. In the present work, these analytical methods are further extended, and a general procedure for predicting the solidification microstructure of single-crystal welds with any arbitrary orientation is established. Examples of this general analysis are given for several welding orientations. It is shown that a nonsymmetric cell structure is expected in transverse micrographs for most welding geometries. The development of steady-state conditions in the weld pool is also examined in terms of the weld pool size, its shape (as revealed by the dendritic growth pattern), and the size of the dendritic cells. It is found that steady state is established within a few millimeters of the beginning of the weld. Furthermore, steady state is achieved faster in welds made at higher welding speeds. A general analysis of the three-dimensional (3-D) weld pool shape based on the dendritic structure as revealed in the two-dimensional (2-D) transverse micrographs is also developed. It is shown that in combination with information on the preferred growth direction as a function of the solidification front orientation, the entire dendritic growth pattern in single-crystal welds can be predicted. A comparison with the actual weld micrographs shows a reasonable agreement between the theory and experiment. Finally, the theoretical analysis of the dendrite tip radius is extended from binary systems to include the case of ternary systems. The theoretical dendrite trunk spacing in a ternary Fe-Ni-Cr alloy is calculated from the dendrite tip radius and is compared with the experimental values for several weld conditions. Good agreement between experiment and theory is found. © 1990 The Metallurgical of Society of AIME.
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收藏
页码:1767 / 1782
页数:16
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