Fig.2 Effects of Ni content on microstructure, strength, and toughness of weld metal of high-strength steel[30,31,33] (Samples with Ni mass fractions of 0%, 2%, 4%, and 6% were designated as Ni0, Ni2, Ni4, and Ni6, respectively)
(a1-a8) in situ laser confocal observation results of bainite nucleation sites in samples Ni6[33] (1, 2, 3, 4—the first, second, third, and fourth growing bainitic laths)
(a9) Euler figure (EF) color map of the investigated grain for identifying various variants—the symbols and numbers indicate the variant numbers[33] (V1, V4, V6, V10, V11, V12, V14, V16, V20, V22, and V23—different variant types) (a10) plot of growing length against time (t) for three typical growth modes at various average rates[33] (b1-b5) microstructures (b1-b4) and fractions (b5) of weld metals in samples Ni0 (b1), Ni2 (b2), Ni4 (b3), and Ni6 (b4)[30] (DUB—degenerate upper bainite, PF—pro-eutectoid ferrite) (b6) prior austenite grain size distributions of weld metals with different Ni contents[30] (c1-c5) effects of Ni content on tensile strength[30] (c1), hardness[30] (c2-c4), and impact energy[31] (DBTT—ductile-brittle transition temperature) (c5) of weld metal
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