AISI 4130 Steel

Steel name: AISI 4130
Diagram No.: 5135
Type of diagram: CCT, TTT
AISI/SAE designation: 4130
Chemical composition in weight %: 0.30% C, 0.64% Mn, 1.00% Cr, 0.24% Mo
Steel group: Structural steels
Note: Figure shows the TTT and CCT diagrams of AISI 4130 steel, along with lines of different rates of cooling. Dashed lines represent the TTT diagram that measures the transformation rate at a constant temperature, while solid lines represent the CCT diagram that measures the extent of transformation as a function of time for a continuous decreasing temperature. The CCT diagram can be slightly shifted to lower temperatures and longer times compared to the TTT diagram. For engineering applications, the CCT diagram is more useful than the TTT diagram. However, the number and accuracy of the CCT diagrams currently available are limited compared to the TTT diagrams because the construction of a single CCT diagram is very time consuming. Therefore, in this study, a series of experimental TTT diagrams are used for comparison with predicted TTT diagrams to evaluate the prediction capability of the microstructure model
Cooling rate affects the decomposition products of austenite. Figure describes the relation between the cooling rate and the resulting transformation products. The highest cooling rate, shown by curve A, leads to formation of bainite and martensite. As the cooling rate reduces, shown by curve B, other transformation products are formed; these include ferrite, bainite and martensite. The slowest cooling rate, shown by curve C, produces ferrite and pearlite. Bainite and martensite are hard and brittle. A coarse-grained prior austenite structure with hard and brittle decomposition products reduces fracture toughness and fatigue resistance.
Reference: Not shown in this demo version.

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