Fig. 16 Isothermal diagrams of low-alloy chromium-molybdenum steels (a) 4130, (b) 4140, and (c) high-chromium (5.5 wt% Cr) steels. Source: Ref 6 More

Fig. 17 End-quench hardenability of (a) 4130, (b) 4140, and (c) high-chromium steels. Source: Ref 6 More

Fig. 12 The effect of heating rate on the Ac 3 critical temperature for 4130 steel. Q&T, quenched and tempered. Source: Ref 14 More

Fig. 50 Time to fracture as a function of applied load for AISI 4130 alloy steel specimens (at 44 HRC) wetted with molten lithium at 200 °C (390 °F). Source: Ref 291 More

Fig. 51 Plot of hardness versus tensile strength for AISI 4130 alloy steel with and without wetting by molten lithium at 205 °C (400 °F). Source: Ref 291 More

Fig. 6 Transformation of retained austenite in 4130 and 4340 steel More

Fig. 20 Transmission electron micrograph showing the microstructure of 4130 steel water quenched from 900 °C (1650 °F) and tempered at 650 °C (1200 °F) Courtesy of F. Woldow More

Fig. 6 In this investment cast gimbal ring, of 4130 steel, a finger of mold material surrounded by molten metal became excessively hot and retarded the freezing of the web section where shown. The resulting hot tearing condition was corrected by redesigning the web so that it extended More

Fig. 11 S-N curve for notched ( K t = 2.0) 4130 alloy steel sheet. Stresses are based on net section. Source: Ref 31 More

Fig. 26 Seam in rolled 4130 steel bar (a) Closeup of seam. Note the linear characteristics of this flaw. (b) Micrograph showing cross section of the bar. Seam is normal to the surface and filled with oxide. 30× More

Fig. 30 Permanent mold of 4130 steel for centrifugal casting of gray- and ductile-iron pipe that failed because of localized overheating. The failure was caused by splashing of molten metal at the spigot end. Subsequent overheating resulted in mold-wall spalling and scoring, details of which More

Fig. 20 Turning data for 4130 steel tubing using four tool bits having different rake angles at V C of 0.45 m/s (90 sfm). (a) Metal removal rate plotted against normal force yields MRP slope (mm 3 /s, kgf): A, 36.3; B, 22.0; C, 13.7; D, 5.73. (b) Power plotted against metal removal rate More

Fig. 1 (a) Comparison of fatigue life for 4130 steel under fretting and nonfretting conditions. Specimens were water quenched from 900 °C (1650 °F), tempered 1 h at 450 °C (840 °F), and tested in tension-tension fatigue. Normal stress was 48.3 MPa (7 ksi); slip amplitude was 30 to 40 μm. (b More

Fig. 73 Stress-corrosion resistance and fracture toughness of AISI 4130 and 4140 steels More

Fig. 1 Effects of fretting. (a) Comparison of fatigue life for 4130 steel under fretting and nonfretting conditions. Specimens were water quenched from 900 °C (1650 °F), tempered 1 h at 450 °C (840 °F), and tested in tension-tension fatigue. Normal stress was 48.3 MPa (7 ksi); slip amplitude More

Fig. 15 Isothermal transformation (IT) diagram for AISI 4130 steel austenitized at 843 °C (1550 °F) and austenite grain size 9–10 ASTM. Source: Ref 54 More

Fig. 14 Scanning electron micrographs of AISI 4130 steel. (a) and (b) Fractures of resulfurized steel that had been quenched and tempered to 1400 MPa. (c) Low-sulfur AISI 4130 steel that had been spheroidized to 600 MPa. In all three photographs, particles can be found in the dimples. Source More

Fig. 8 Isothermal transformation (upper) and CCT (lower) diagrams for AISI 4130 steel containing 0.30% C, 0.64% Mn, 1.0% Cr, and 0.24% Mo. The IT diagram illustrates the input data representation for calculations described in the text. The CCT diagrams are computed (dashed lines More

Fig. 11 CCT diagrams for AISI 4130 steel. (a) Water quench, 0.8 R specimen. (b) Water quench, center of specimen. (c) Oil quench, 0.8 R specimen. (d) Oil quench, center of specimen. Source: Ref 16 More

Fig. 14 Comparison of fatigue life for 4130 steel under fretting and nonfretting conditions. Specimens were water quenched from 900 °C (1650 °F), tempered 1 h at 450 °C (840 °F), and tested in tension-tension fatigue. Normal stress was 48.3 MPa (7 ksi); slip amplitude was 30 to 40 μm. More