ITT Diagram 4130 Steel 800 400 4130 Composition (%wt 700 0.33% C F C 200 A F 24

Question

ITT Diagram 4130 Steel 800 400 4130 Composition (%wt 700 0.33% C F C 200 A F 24 0.90% Cr 600 24 000 A F C 0.18% Mo 500 28 0.53% Mn eool A 37 W 400 44 H 300 T DIAGRAM 200 400 C-Carbide Estimated 00 200 Temper 56 MIN 0.5 I 2 5 KO TIME SECONDS THE UNIVERSITY of VERMONT 4130 Steel Hardenability (Jominy Test) 41 30 60 E- Q HARDENABILITY o 59 Mn o 32 C C-0.33 Mn-0.53 50 o 95% C 20% Mo 80 Cr-0.90 Mo-0.18 Austen ed at 550 F Grain Size 7 40 Austenitized at 1550°F 40 un 30 HARDNESS Grain Size: 9-10 I 20 20 MARTENSITE LEGEND A- Austenite M Martensite F Ferrite B Bainite C Carbide P Pearlite 24 32 40 DISTANCE FROM QUENCHED ENO -M6 INCH UNITs

Explanation / Answer

Annealing- enhance machinability, relieve the internal stresses, refine grain size and induces fracture toughness.

Induction hardening- heats the component to the austenitizing temperature. It is held at this temperature long enough so that the formation of austenite is complete. Austenite structure is strong and tough.

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