Failure analysis of cold forged 37Cr4 alloy M10x28 bolts

Kılıçaslan, Cenk; İnce, Umut

doi:10.1016/j.engfailanal.2016.08.006

Cited by 15 publications

(4 citation statements)

References 28 publications

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“…Both models are studied in this research. Due to the crankcase, oil temperature in diesel engines is seen in the range of 90-110 C; thus, according to [45][46], in this temperature range, about 10% of the yield and tensile strength is reduced. On the other hand, according to Farrahi et al [20] and Fonte et al [41], the maximum stresses of the torsional and bending forces are about 15% and 30% of yield strength occurring in the crankpin llet regions.…”

Section: Evaluation Of Fatigue Crack Growth 41 Stress Analysismentioning

confidence: 99%

Microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft

Alilakbari

Imanparast

Nejad³

2018

Scientia Iranica

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The main goal of this research is the experimental and numerical study of the fatigue function and failure of the crankshaft of the diesel engine of a heavy truck. To this end, a crankshaft of the diesel engine of a heavy truck that underwent failure after traveling 955000 km was used. The crack developed from the third crankpin, leading to nal failure in the llet of the 4th crankpin. To investigate the roots of this failure, several experimental studies were carried out. Besides, by using a three-dimensional nite element method, the location of the maximum stress in the crankshaft was determined using \complete crankshaft model" and \one-crank model". The application of the results of stress analysis was the basis for the crack growth model and fatigue life estimation to determine the stress intensity factor and fatigue life considering the related parameters and boundary conditions. At the nal stage, by using the results obtained from the given model for the fatigue crack growth, comparing them with experimental results, and examining the whole process, it was concluded that the scratches in crankpin region were the main reason for the fatigue failure obtained from the bending-torsional load-combination.

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Section: Evaluation Of Fatigue Crack Growth 41 Stress Analysismentioning

confidence: 99%

Microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft

Alilakbari

Imanparast

Nejad³

2018

Scientia Iranica

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“…1.7038, which has high rupture strength and creep strength at high temperatures, good impact toughness at low temperatures, good hardenability, no overheating tendency, small quenching deformation, general plasticity at cold deformation and good machinability. Poor weldability, preheating before welding, and heat treatment after welding to eliminate stress, generally used after quenching and tempering, can also be used after medium and highfrequency surface quenching or quenching and low and medium temperature tempering [1,2]. It is widely used for important structural parts under high load conditions, such as transmission parts of vehicles and engines, rotor, main shaft, transmission shaft under heavy load of the steam turbine generator, large section parts, forgings with higher strength and larger quenched and tempered section than 35CrMo steel, such as big gear for locomotive traction, transmission gear of supercharger, rack, rear axle, connecting rod and spring clamp under great load.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal deformation behavior and workability of 37CrS4 special steel

Yang¹,

Wang²,

Xue³

2023

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In order to optimize the thermal forging process of 37CrS4 special steel, single-pass thermal pressing tests are conducted, and a strain compensation Arrhenius constitutive equation is proposed based on the stress-strain curves of 37CrS4 at the temperature of 900-1100 • C and the strain rate of 0.1-10 s −1 . The stress values calculated from the equation are in good agreement with the counterparts in the thermal simulation compression test. The high correlation between the calculated and experimental data verifies the correctness of the strain compensation based on Arrhenius constitutive equation. According to the dynamic material model and instability criterion, the processing maps of 37CrS4 are established. It is concluded that 37CrS4 is more suitable for thermal working at a strain rate of 0.1-0.37 s −1 and temperature of 1000-1100 • C.

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“…Forming of hollow products is a frequently used manufacturing method due to its advantages such as material savings, improvement of mechanical properties and physical properties, low unit costs, the possibility of forming complicated shapes. Simultaneously the product obtained as a result of metal forming maintains the continuity of the fibres in the product [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

FEM analysis of manufacturing of a hollow product with an outer flange in a four-stage cold forming process

Wójcik

Bulzak

Winiarski

2021

J. Phys.: Conf. Ser.

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The paper presents the results of a FEM computer simulation of the cold forming process of a hollow sleeve forgings with an outer flange. Numerical simulations were carried out in DEFORM 2D / 3D. For the numerical calculations of the forming process the axisymmetric calculation module was used. As the test object, a tubular workpiece with an outer diameter of Ø50 mm and a wall thickness of 10 mm made of 42CrMo4 steel was used. The process of forming the rotary sleeve was conducted in four stages consisting of two technologies. The first stage of the research was the analysis and selection of parameters of the extrusion process, which was used for the first stage of forming. The processes of free extrusion and the use of a container were analysed. Furthermore different die angles and different wall thickness reductions were used. The products obtained in the extrusion process were upset in three conical blanks. The aim of the study was to analyse the numerical accuracy of the designed process of forming the hollow shaft with flange. The analysis of the results was based on the deformation intensity distribution maps, the Cockroft-Latham criterion distribution and the progress of the forming forces. On the basis of the conducted research, it was concluded that the presented process of forging a hollow product with a flange in four stages is possible to carry out correctly.

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Failure analysis of cold forged 37Cr4 alloy M10x28 bolts

Cited by 15 publications

References 28 publications

Microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft

Microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft

Analysis of thermal deformation behavior and workability of 37CrS4 special steel

FEM analysis of manufacturing of a hollow product with an outer flange in a four-stage cold forming process

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