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MIL A46100 Steel
Steel name: MIL A46100
Diagram No.: 7285
Type of diagram: TTT
Chemical composition in weight %:
MIL A46100: 0.28% C, 0.53% Si, 0.90% Mn, 0.002% S, 0.30% Cr, 0.24% Mo, 0.19% Ni, 0.007% V, 0.03% Ti, 0.18% Cu, 0.02% Al
E11018M: 0.05% C, 0.46% Si, 1.64% Mn, 0.36% Cr, 0.37% Mo, 2.23% Ni, 0.02% V
Steel group: Alloy steels
Note: Calculated diagrams. TTT cooling diagrams for austenite decomposition as a function of peak temperature (Tp) in the HAZ. The distance
from the fusion line (X), the fraction of austenite (f.) formed at peak temperature, and the final fraction of martensite (f(alpha)),
bainite (fB), and ferrite (f.) present at room temperature (Tend) are given.
Figure shows an arrangement of TTT diagrams describing
austenite decomposition kinetics in the HAZ during welding
cooling. These TTT diagrams were obtained using the AC3
software. Additionally, the figure also shows the relationship
between distance from the fusion line and final fraction of microstructure components, which is the product of austenite
decomposition.
In the fully austenitized HAZ, i.e. GG-HAZ (from 0 to 1mm)
and FG-HAZ (from 1 to 2.5 mm), bainite fractions increasing
from 15 to 50 vol.% are predicted. On the other hand, in the ICHAZ
(from 2.5 to 5mm) the predicted fraction of bainite and
martensite suddenly decreases when distance fromthe fusion
line is increased.
Although TTT diagrams predict high hardenability of
austenite (equilibrium austenite reached at peak temperature)
in the intercritical region, the sudden droop in austenite fraction
with distance from the fusion line is a serious drawback
for hardness of the steel.
Reference: Not shown in this demo version.
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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.