A Study of the Influence of WC-10Co-4Cr HVOF Coating on Mechanical Properties of AISI 4340 Steel

2001 ◽  
Author(s):  
Renato Chaves Souza ◽  
Marcelino Pereira Do Nascimento ◽  
Herman Jacobus Cornelis Voorwald ◽  
Walter Luís Pigatin
Keyword(s):  
Mechanical Properties ◽  
Aisi 4340 Steel ◽  
Hvof Coating ◽  
4340 Steel ◽  
Aisi 4340

scholarly journals Microstructure and Mechanical Properties Analysis of Quenched and Tempered AISI 4340 Steel

2019 ◽  
Vol 3 (12) ◽  
pp. 675
Author(s):  
I Basori ◽  
A Surocaena ◽  
S Titik Dwiyati ◽  
Y Sari ◽  
B Singh
Keyword(s):  
Mechanical Properties ◽  
Aisi 4340 Steel ◽  
Microstructure And Mechanical Properties ◽  
4340 Steel ◽  
Aisi 4340

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scholarly journals Mechanical characteristics evaluation of dual phase and related hardening techniques on AISI 4340 steel

2018 ◽  
Vol 12 (4) ◽  
pp. 4018-4029
Author(s):  
Sathyashankara Sharma ◽  
B. M Gurumurthy ◽  
U. Achutha Kini ◽  
Ananda Hegde ◽  
Ajinkya Patil
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Salt Bath ◽  
Air Cooling ◽  
Dual Phase ◽  
Aisi 4340 Steel ◽  
Treatment Processes ◽  
4340 Steel ◽  
Wide Range ◽  
Aisi 4340

Steel has wide range of applications and is used in various machinery and general metallic components. Depending on the particular application, steels with tailorable and appropriate properties are used. This requires various methods which can be used to alter the properties based on the requirements. Generally, mechanical properties of the steel are improved by conducting the heat treatment processes. The aim of the present work is to experimentally investigate the effects of conventional heat treatments and special hardening techniques for dual phase structure on mechanical properties of AISI 4340 steel. The test specimens are machined as per ASTM standards and hardness, tensile, impact and microstructure analysis were carried out after the heat treatment processes. Dual phase heat treatment to obtain ferrite-bainite structure is performed by heating the as-bought specimen to the intercritical temperature for two hours followed by isothermal holding in fusible salt bath containing sodium nitrate and sodium nitrite at subcritical temperature for 30 minutes and cooling in air to room temperature. Similarly, ferrite-martensite structure is obtained by air cooling after holding isothermally in the salt bath for 10 seconds.  Ferrite-bainite steel was observed to be soft, whereas ferrite-martensite steel was relatively harder. Austempered steel has high toughness with optimum hardness and conventionally hardened steel is the hardest among all. Microstructure shows colony of bainite and martensite in ferrite matrix of ferrite-bainite and ferrite-martensite dual phase structures respectively. An increase in brittleness was observed with the increase in hardness due to the conventional hardening to display lesser impact strength compared to austempered steel.

scholarly journals Tempering Influence on Residual Stresses and Mechanical Properties of AISI 4340 Steel

2021 ◽  
Author(s):  
Marcel Souza ◽  
Luana Ferreira Serrão ◽  
Juan Manuel Pardal ◽  
Sérgio Souto Maior Tavares ◽  
Maria Cindra Fonseca
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
X Ray Diffraction ◽  
Tempered Martensite ◽  
Tempering Temperature ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
4340 Steel ◽  
Compressive Residual Stresses ◽  
Aisi 4340

Abstract The present work evaluated the tempering temperature influence on microstructure, mechanical properties and residual stresses of AISI 4340 steel. The residual stresses were measured by X‑ray diffraction (XRD) by the sin²ψ method and compared to magnetic Barkhausen noise (MBN). The residual stresses exhibited high tensile values after quenching, but a small relief was observed in tempering treatments at 300°C and 400°C, which also presented a hardness decrease compared to the as‑quenched condition. XRD and MBN analyses indicated that residual stresses became compressive in tempering performed between 500°C and 650°C. Therefore, compressive residual stresses combined with appropriate hardness and toughness values (35 HRC and 33 J) obtained from 500°C tempering temperature can be used to improve the mechanical properties of AISI 4340 steel components. Additionally, a mathematical model was established to estimate the tempered martensite hardness for different tempering temperature conditions. This model showed high accuracy (R2=0.99) for a holding time of 90 minutes.

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