Fig. 108 Effects of annealing a molybdenum-implanted aluminum sample at 550 °C (1020 °F) for 100 min. (a) Bright-field micrograph showing pseudolamellar Al 12 Mo precipitates (dark areas). (b) ⟨001⟩ CBEDP from the precipitates showing two mirror symmetry planes (m). Source: Ref 114 More

Fig. 119 Brittle fracture of AISI 1020 hydraulic jack shaft. Failure originated at root of machined thread. Corrosion (evident on part) and fatigue (due to repeated loading of shaft) may also have played roles in the failure. Photomicrograph of fracture surface shows transgranular cleavage More

Fig. 122 A further enlargement of a centerline crack in the AISI 1020 steel tensile-test specimen shown in Fig. 120 and 121 . Note that the crack crosses alternate plates of ferrite and pearlite; note also the longitudinal deformation of the original equiaxed structure. Nital etch, 312.5× More

Fig. 25 End-quench hardenability curve for 1020 steel carbonitrided at 900 °C (1650 °F) compared with curve for the same steel carburized at 925 °C (1700 °F). Hardness was measured along the surface of the as-quenched hardenability specimen. Ammonia and methane contents of the inlet More

Fig. 3 Microstructure of the cross section of SAE 1020 shim stock carburized at 925 °C (1700 °F) in 1.4 wt% C (supersaturated) atmosphere carbon potential for different exposure times. (a) 30 min. (b) 2 h. (c) 4 h More

Fig. 14 End-quench hardenability curve for 1020 steel carbonitrided at three different temperatures compared with curve for the same steel carburized at 925 °C (1700 °F). Hardness was measured along the surface of the as-quenched hardenability specimen. Ammonia and methane contents More

Fig. 34 Schematic of changes in creep strengthening contributions at 550 °C (1020 °F) in (a) normalized molybdenum steel and (b) normalized and tempered molybdenum steel. Source: Ref 57 More

Fig. 5 Optical micrographs of 0.70% C steel wire patented at 550 °C (1020 °F) in (a) lead bath and (b) 0.25% carboxymethyl cellulose aqueous solution More

Fig. 40 Tensile ductility of AISI/SAE 1020 carbon steel as a function of strain rate and test temperature for (a) spheroidize-annealed specimens and (b) cathodically charged specimens. Curve i bounds the range of strain rates and temperatures where embrittlement was observed. Source: Ref More

Fig. 41 Fracture strain and hydrogen content of AISI/SAE 1020 steel as a function of charging time for tensile tests conducted at room temperature, with a strain rate of 0.05 min −1 . Source: Ref 255 More

Fig. 19 Comparison of short-time tempering data for 1020, 1042, and 1095 carbon steels with base hardness curves for 1020, 1050, and 1080 steels from Grange and Baughman. Source: Ref 3 , 8 More

Fig. 20 Comparison of short-time tempering data for 1020 steel (0.22C-0.81Mn-0.18Si-0.014P-0.036S-0.13Ni-0.18Cr-0.046Mo) with predictions based on Grange-Baughman base data for 1020 steel and hardness increment factors. Source: Ref 6 , 8 More

Fig. 23 Comparison of tempering data for 1020 steel given salt-pot and induction treatments with a prediction based on Grange and Baughman's 1020 results and hardness increment factors (alloying factors). Source: Ref 8 More

Fig. 52 Ultrahigh-carbon (UHC) steel/1020 steel laminated composite to improve impact resistance of fine-grain UHC steels. (a) Orientation of mechanical test samples taken from a laminated composite of UHC steel and 1020 steel. (b) Optical micrograph of interface in laminated composite of UHC More

Fig. 37 Tensile fracture of a 1020 steel showing slanted fracture intersecting the outside surface at an angle More

Fig. 38 Fractured 1020 steel showing an angled connection between a cup portion on one half of the fractured bar and a cup portion on the other half More

Fig. 9 Brittle fracture of AISI 1020 hydraulic jack shaft. Failure originated at root of machined thread. Corrosion (evident on part) and fatigue (due to repeated loading of shaft) also may have played roles in the failure. Micrograph of fracture surface shows transgranular cleavage More

Fig. 23 Microstructures at the surface and core of carburized AISI 1020 carbon steel slowly cooled from the carburizing temperature. 2% nital; 200× More

Fig. 10 Spall data for low-carbon 1020 steel More

Fig. 5 Surface of 1020 steel eroded by SiC at 80 m/s (260 ft/s) and 30° impact angle More