Magneto-absorption studies of n-lnSb using a CO laser and sensitive photoconductive techniques provide evidence for the presence of excitons bound to neutral acceptors. Additional structure observed arises from free-exciton and neutral impurity-to-band transitions....
The corresponding values for the directionally cast 22 kg heat of AISI 4340 steel (which were all transverse specimens) are included in the lower part of the table, as well as the ingot compositions. The results shown in Table 1 indicate that the ultimate tensile stress and the yield stress...
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During bake hardening (BH) flat tensile AISI 4340 steel specimens were pre-strained to 2% and baked at 170°C for 20 minutes a headed with uniaxial tensile testing in which there was no improvement in yield strength after bake hardening observed. This might be because of the low amount of ...
Studies demonstrated that the film-like RA on the martensite lath grain boundaries was the primary contributor to the enhanced toughness of the steel [11]. Euser et al. [12] noted that the improvement in the impact toughness of 4340 steel by fast tempering inhibited the RA decomposition. ...
[11,12,13] This article extends the rangeof tempering conditions to evaluate specimens of 4330, 4340,and 4350 steel tempered at 150 7C, 175 7C, and 200 7C andfor times of 10 minutes, 1 hour, and 10 hours, respectively.Thus, the mechanical properties, deformation behavior, andfracture ...
Dependency of the mechanical properties of step quenched dual phase steels on the volume fraction of martensite Dependency of the mechanical properties of low carbon dual phase steel on the volume fraction of martensite was evaluated for dual-phase (DP) steels proces... M Soleimani 被引量: 0发...
Armor grade Q&T steels very similar to AISI 4340 are used for construction of combat vehicles due to its high hardness, high strength to weight ratio and excellent toughness. The influence of friction welding parameters on microstructure and mechanical properties of such armor steel friction weld ...
In the present study, high-chromium ferrochromium carbon hypereutectic alloy powder was coated on AISI 4340 steel by the gas tungsten arc welding (GTAW) process. The coating layers were analyzed by optical microscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM),...
The effect of step quenching on the microstructure and fracture toughness of aisi 4340 steel The microstructure and fracture toughness of AISI 4340 steel in the direct and in the step quenched and tempered condition has been studied. Austenitizing ... KH Khan,WE Wood - 《Metallurgical ...