scholarly journals Effect of austempering conditions on the microstructure and mechanical properties of AISI 4340 and AISI 4140 steels

2019 ◽  
Vol 8 (6) ◽  
pp. 5194-5200 ◽  
Author(s):  
Mian Muhammad Bilal ◽  
Khurram Yaqoob ◽  
Mohammad Hammad Zahid ◽  
Ehsan ul haq ◽  
Waqas Hassan Tanveer ◽  
...  
2011 ◽  
pp. 745-753
Author(s):  
A.H. Meysami ◽  
R. Ghasemzadeh ◽  
H. Seyedyn ◽  
M.R. Aboutalebi ◽  
R. Rezaei

2011 ◽  
pp. 245-253
Author(s):  
A.H. Meysami ◽  
R. Ghasemzadeh ◽  
H. Seyedyn ◽  
M.R. Aboutalebi ◽  
R. Rezaei

2019 ◽  
Vol 3 (12) ◽  
pp. 675
Author(s):  
I Basori ◽  
A Surocaena ◽  
S Titik Dwiyati ◽  
Y Sari ◽  
B Singh

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2013 ◽  
Vol 774-776 ◽  
pp. 1059-1067 ◽  
Author(s):  
Wichan Chuaiphan ◽  
Loeshpahn Srijaroenpramong ◽  
Dumrongrit Pinpradub

The effects of heat treatment on microstructure and mechanical properties of AISI 4140 for base cutter cane harvester were studied. The effect of heat treatment - i.e. the different quenching medium (water, oil and air mediums) and the different heat treatment condition (quenching, quenching+tempering, cover scrap cast iron+ quenching and cover scrap cast iron+ quenching+tempering) on the on microstructure and mechanical properties (hardness, impact toughness and bend test). The material AISI 4140 was purchased from local market in Thailand and an emission spectroscopy was applied to quantify the amount of elements in steel. The specimens were heat treated in an induction furnace. The resultant microstructure of materials AISI 4140 consists of martensite and retained austenite after quenching all mediums, which quenching in water it have more than in oil and air medium respectively. The microstructure of materials AISI 4140 after tempering process consists of bainitic structure (ferrite and epsilon carbide) and retained austenite, which tempering in water quenching condition it have more than in oil and air quenching condition respectively. The hardness, impact toughness and bended test are according to behavior heat transfer of quenching mediums. The material alloy steel grade AISI 4140 is the good candidates to promote the quenching in water ,oil and air medium and must be continuous to tempering process. The technique heating by cover scrape cast iron it was good for protected surface and decreased decarburization on surface of steels. But it is not necessary for control microstructure and mechanical properties.


Author(s):  
Abdul Rauf Rauf Jamali ◽  
Waseem Khan ◽  
Ali Dad Chandio ◽  
Zubai Anwer ◽  
Muhammad Hayat Jokhio

From last epoch till to date, AISI 4340 and AISI 4140 have been widely used in different engineering applications. These applications include bolt, screws, gears, drive shafts, crane shaft and piston rods for engines due to its upright mechanical properties, cost-effective and easily available in market. In present work, deep cryogenic treatment effect on the mechanical properties of AISI 4340 and AISI 4140 have been studied. Present work was carried out at laboratory scale and can be extended for mass production. Our work is simple, straight forward safe and economical. In our work, samples were heat treated in simple muffle furnace and followed by cryogenic treatment in liquid nitrogen. Before cryogenic treatment, all samples were normalized at 860°C to obtain homogenized micro structure. Samples were also compared conventionally heat treatment with quenched in oil quenchant. Experimental results showed that after cryogenic treatment with tempering treatment, one could easily increase the tensile strength, impact toughness and hardness. Advanced optical microscopy (IMM 901) and SEM (Scanning Electron Microscopy), FIT Quanta 200 methods have also been deployed to reveal and interpret the internal structure of samples. It was found from micro structure that cryogenic treated sample increases the impact strength, hardness and tensile strength as compared conventional heat treated quenching approaches.


2011 ◽  
pp. 509-517
Author(s):  
A.H. Meysami ◽  
R. Ghasemzadeh ◽  
H. Seyedyn ◽  
M.R. Aboutalebi ◽  
R. Rezaei

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