2023年1月18日 · The microstructural evolution during high-energy ball milling, spark plasma sintering (SPS), and heat treatment (i.e., quenching at 800–900 °C and tempering at 400–600 °C) of AISI 4340 steel, and its impact on mechanical properties were investigated using XRD, SEM, EBSD, TEM, and hardness measurements.

Abstract —Present investigation deals with the mechanical properties and microstructure of dual phase (DP) steel. Normalizing and intercritical annealing heat treatments were carried out at 900, 750, 770, and 790 ̊C and DP ferrite–martensite steel was obtained.

2011年3月15日 · AISI 4340 steel were successfully deposited using a DMD system with diode laser on a mild steel substrate. The samples consisted of an alloy layer and 7 more layers on top. The microstructural phases identified in the clad using SEM, XRD and TEM were ferrite, martensite and cementite.

This experimental research presents a concise comparative investigation on machinability characteristics of high-strength grade hardened steel (AISI 4340) through dry and MQL environments for...

AISI 4340 steels are used in applications where high strength and toughness are required, for example, in power transmission gears and shafts, aircraft landing gear and other structural...

2020年8月13日 · The dual-phase microstructure of AISI 4340 steel, ob- tained by IQ treatment has the highest toughness, the highest elongation and the highest impact energy ever

2022年12月1日 · A novel low-alloy ultrahigh-strength steel featuring excellent mechanical properties and comprising a nanolath structure was fabricated in this work using a quenching–partitioning–tempering (Q-P-T) …

2023年2月18日 · The current research is based on an attempt to achieve ultra-high strengths in AISI 4340 steel, by the quench and partitioning (QP) heat treatment processes. In this study, the microstructure and mechanical properties of the advanced QP process are compared with the quenching and tempering (QT) and the austempering processes.

2023年6月19日 · In the present study, a heterostructure microstructure consisting of micro-sized residual ferrite zones and pearlitic zones was introduced by an optimized process of intercritical quenching and tempering, resulting in a steel with higher strength and better toughness.

1999年3月15日 · In this work, the mechanical properties and microstructures of AISI 4340 high strength alloy steel under different tempering conditions are investigated. The specimens are quenched and tempered to a martensite structure and loaded to fracture at a constant strain-rate of 3.3×10 −4 s −1 by means of a dynamic material testing machine (MTS 810).