Dendrite arm spacing

Chapter 6 contains some general conclusions regarding solidification phenomena which are common for the groups of steels. References to the relevant literature have been made throughout and are listed in full in chapter 7. Chapter 8 comprises master tables of chemical compositions and thermal analysis data for all the steels included in the study. In addition, this chapter includes tables of dendrite arm spacings and microsegregation. 

Figure 1.2 Dendrite arm spacings in commercial 0,14—0,88% C-steel ingots (After Suzuki A. et al, J. Japan Inst, of Metals, (1968) 1301-1305.) [28]...

Figure 1.3 Dendrite arm spacings in production scale ingots...

Figure 1.9 Primary and secondary dendrite arms in a typical field showing a traverse followed for the measurement of secondary dendrite arm spacings and electron microprobe analysis, (steel number 410).

Quenching temperature, °C Secondary dendrite arm spacing, pm Ferrite and austenite Quenched liquid... 

General investigations of the solidification of high speed steels dealing with development of the structure, constitution and reaction mechanisms have been reported, [87-95]. Quantitative data on microsegregation may be found in references [90, 91, 94, 98). Factors controlling dendrite arm spacings and carbide sizes are discussed in references [93, 96, 97]. 

Table 8.4 a Carbon and Low Alloy Steels, secondary dendrite arm spacings ()im). 

Kud] Kudoh, M., Wo, B., Effects of Solute Elements on Primary and Secondary Dendrite Arm Spacings in Fe-based Alloys , Steel Res., 74(3), 161-167 (2003) (Calculation, Experimental, Phase Relations, 14)... 

Where, Ds is the diffusion coefficient of solute in the solid phase in ernes, solidification time in seconds, and Ajis the secondary dendrite arm spacing in cm. Local solidification time (in seconds) is defined as follows ... 

Figure 15 shows the primary and secondary dendrite arm spacings in the specimens. Both primary and secondary arm spacings increase with an increase in the distance from the chilled surface. The secondary arm spacing differs little between the two steels, whereas the primary arm spacing, compared at the same location, is smaller in rare-earth-added steel than in rare-earth-ffee steel. This distinct tendency was observed in both ingots and continuously cast slabs. 

Fig. 6.13 (a) A magnesium-zinc dendritic aiioy specimen dendrite arm. spacing... 

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