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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