scholarly journals An analysis of plastic instability in pure shear in high strength AISI 4340 steel

1973 ◽  
Vol 4 (4) ◽  
pp. 1190-1190 ◽  
Author(s):  
Kohichi Tanaka ◽  
Joseph Spretnak
Keyword(s):  
Pure Shear ◽  
High Strength ◽  
Plastic Instability ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Micromanufacturing Technology and its Practice

2020 ◽  
Vol 311 ◽  
pp. 12-20
Author(s):  
Zheng Yi Jiang ◽  
Mahadi Hasam ◽  
Hamidreza Kamali ◽  
Fang Hui Jia ◽  
Hai Bo Xie
Keyword(s):  
Time Pressure ◽  
High Strength ◽  
Fe Modelling ◽  
Aisi 4340 Steel ◽  
Bonding Parameters ◽  
Micro Deep Drawing ◽  
4340 Steel ◽  
New Material ◽  
Steel Joints ◽  
Aisi 4340

In order to make micro composite drills (Fig. 1), cemented tungsten carbide (WC-10Co) and high strength (AISI 4340) steel were successfully bonded by hot compaction diffusion bonding at a low temperature. The effects of holding time, pressure and temperature on microstructure and mechanical properties of the sintered carbides and bonding strengths of the bimetallic composites were examined, and a transitional layer was found at the interface as a result of elemental inter-diffusion. The optimal bonding parameters were determined to achieve the maximum bonding strength of 226 MPa of the WC-10Co/AISI 4340 steel joints, which is helpful in producing micro composite drills. Microforming is introduced to produce lighter and more energy effective products. In this study, Magnesium-Lithium (Mg-Li) alloy, new material in microscale, was chosen to superior formed micro-cup due to its ultralight weight with outstanding ductility. The dry and oil lubrication conditions were chosen as benchmarks to investigate effects of a novel oil-based nanoparticle lubricant in micro deep drawing (MDD) process of Mg-Li alloy. Finite Element (FE) modelling was conducted and the simulation results of the drawing force were in a good agreement with the experimental results. The formed cup quality with consideration on the surface roughness has been extensively evaluated and the results illustrated the quality improvement was substantial.

Effect of Hydrogen and Magnetic Field on the Mechanical Behavior of High Strength AISI 4340 Steel

2012 ◽  
Vol 22 (4) ◽  
pp. 1028-1034
Author(s):  
Meenakshisundaram Ramanathan ◽  
Biswadeep Saha ◽  
Chai Ren ◽  
Sivaraman Guruswamy ◽  
Michael McCarter
Keyword(s):  
Magnetic Field ◽  
Mechanical Behavior ◽  
High Strength ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI 4340 steel

2014 ◽  
Vol 606 ◽  
pp. 46-57 ◽  
Author(s):  
Shi Da Sun ◽  
Qianchu Liu ◽  
Milan Brandt ◽  
Vladimir Luzin ◽  
Ryan Cottam ◽  
...  
Keyword(s):  
High Strength ◽  
Fatigue Behaviour ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

scholarly journals Effect of Selected Cooling and Deformation Parameters on the Structure and Properties of AISI 4340 Steel

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5585
Author(s):  
Maros Eckert ◽  
Michal Krbata ◽  
Igor Barenyi ◽  
Jozef Majerik ◽  
Andrej Dubec ◽  
...  
Keyword(s):  
High Strength Steel ◽  
True Strain ◽  
Peak Stress ◽  
High Strength ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Cooling Rates ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Aisi 4340

The paper is focused on investigation of the high-strength AISI 4340 steel at various temperature and deformation conditions. The article is divided into two specific analyses. The first is to examine the dilatation behavior of the steel at eight different cooling rates, namely, 100, 10, 5, 1, 0.5, 0.1, 0.05 and 0.01 °C·s−1. The mapping of the phase transformations due to varying cooling rates from the austenitizing temperature of 850 °C allows the construction of the CCT diagram for a given high-strength steel. These dilatation curves were also compared with the metallography of the selected samples for the proper construction of the CCT diagram. A further analysis of the high temperature deformation of high strength steel AISI 4340 was performed in the range of temperature 900–1200 °C, and the strain rate was in the range from 0.001 to 10 s−1 with maximum value of the true strain 0.9. Changes in the microstructure were observed using light optical microscopy (LOM). The effect of hot deformation temperature on true stress, peak stress and true strain was investigated. The hardness of all deformed samples, depending on the temperature, the deformation rate and the peak stress σp overall together related with hardness, has also been evaluated.

Embrittlement of High Strength AISI 4340 Steel in Boiling NaCl Solution

CORROSION ◽  
1966 ◽  
Vol 22 (9) ◽  
pp. 265-269 ◽  
Author(s):  
HUGH L. LOGAN ◽  
JOHN M. WEHRUNG
Keyword(s):  
High Strength ◽  
Nacl Solution ◽  
Corrosive Media ◽  
Exterior Surface ◽  
Aisi 4340 Steel ◽  
4340 Steel ◽  
Steel Tubing ◽  
Initial Fracture ◽  
Mode Of Development ◽  
Aisi 4340

Abstract The resistance of high strength AISI 4340 steel tubing, quenched in oil and tempered at 425 F (218 C), to corrosive media has been investigated. The exterior surface of the specimen was exposed to boiling NaCl, the interior cavity was evacuated and the specimen was subjected to a tensile stress. Specimens failed, with little evidence that cracking was developing, after several hours' exposure and after hydrogen had penetrated through the specimen wall. Appearance of the initial fracture and its mode of development indicate it originated within the specimen wall. The data indicate that failure resulted from hydrogen embrittlement.

Influence of Minimum Quantity Lubrication on Grinding Performance of Annealed AISI 4340 Steel

2017 ◽  
Vol 31 (2) ◽  
pp. 17 ◽  
Author(s):  
Sirsendu Mahata ◽  
Ankesh Samanta ◽  
Joydip Roy ◽  
Bijoy Mandal ◽  
Santanu Das
Keyword(s):  
Minimum Quantity Lubrication ◽  
Aisi 4340 Steel ◽  
Minimum Quantity ◽  
Grinding Performance ◽  
4340 Steel ◽  
Aisi 4340
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