Effect of Charpy Impact Test on Microstructure Properties of AISI4140 Steel

2020 ◽  
Vol 22 (4) ◽  
pp. 1463-1470
Author(s):  
Djamel Chaouch ◽  
Ahmed Sadok ◽  
Seif-Eddine Bendaoudi ◽  
Abdallah Chaouch
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Impact Test ◽  
Temper Embrittlement ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Standard Test ◽  
Low Alloy Steel ◽  
Tempering Temperature ◽  
Martensite Structure

AbstractIn this paper, the mechanical properties and microstructures of AISI4140 low alloy steel under different tempering conditions are investigated. The samples are quenched, tempered to a martensite structure and loaded to fracture by means of Charpy machine according to standard test. Fractography analysis showed that the morphology fracture surface was changed by increasing tempering temperature. The variation of energy of Charpy impact fracture as a function of tempering temperature exhibits minimum values at 300 °C, which suggests the occurrence of temper embrittlement.

scholarly journals Basic mechanical properties of layered steels

2013 ◽  
Vol 61 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Michal Černý ◽  
Josef Filípek ◽  
Pavel Mazal ◽  
Petr Dostál
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Mechanical Tests ◽  
Tempering Temperature ◽  
Technical Practice ◽  
Steel Bars ◽  
Multilayer Steel ◽  
Quenching And Tempering

This article deals with identifying attributes of layered steel materials (damask steel) with the help of mechanical tests. Experimentally verify basic mechanical properties of layered steel and subsequently assessed it in comparison with the values obtained for the classic steel materials. In conclusion, there are listed the possibilities of using multilayer steel materials in technical practice, depending on the economics of production.The damask steel was prepared by forge welding from a packet consisting of 17 layers (9 layers of tool steel 19 133 (ČSN) with the thickness of 6 mm and 8 layers 80NiCr11 steel in the form of saw bands with the thickness of 1.2 mm. The packet was cut into 8 parts, folded 3 times and forged together, which provided damask steel with 136 layers. The resulting steel bars were used to make semi-finished products with the approximate dimensions of the test specimens. For evaluation of mechanical properties were applied the following tests: tensile test, Charpy impact test, hardness and microhardness measurementsThe results of tests proved that the properties of damask steel are dependent not only on the direction led impact quality forge weld layers and content iof nhomogeneities in the place of discord, but also on the quenching and tempering temperature, resp. on the choice of quenching bath, which determine the final structure of steel and the resulting hardness, respectively microhardness.

Influence of Honeycomb Core Compression on the Mechanical Properties of the Sandwich Structure

2013 ◽  
Vol 486 ◽  
pp. 283-288
Author(s):  
Ladislav Fojtl ◽  
Soňa Rusnáková ◽  
Milan Žaludek
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Low Velocity Impact ◽  
Bending Test ◽  
Honeycomb Core ◽  
Low Velocity ◽  
Three Point Bending ◽  
Core Technology

This research paper deals with an investigation of the influence of honeycomb core compression on the mechanical properties of sandwich structures. These structures consist of prepreg facing layers and two different material types of honeycomb and are produced by modified compression molding called Crush-Core technology. Produced structures are mechanically tested in three-point bending test and subjected to low-velocity impact and Charpy impact test.

Evaluation of Shear Area of DWTT Fracture Surface With Instrumented System

2009 ◽  
Author(s):  
Seong Soo Ahn ◽  
You Sun Ham
Keyword(s):  
Fracture Toughness ◽  
Fracture Surface ◽  
Dynamic Loading ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Displacement Curve ◽  
Absorbed Energy ◽  
Long Time ◽  
Shear Area

The test method to evaluate fracture toughness can be divided by the loading type to specimen. A static load is given to specimen for testing KIC, JIC, CTOD, etc. while a dynamic load is given to those for testing Charpy impact test, DWTT, etc. In case of fracture toughness tests with static loading, the data of load and displacement should be gathered during test because they were driven from fracture mechanics. In case of fracture toughness tests with dynamic loading, however, we don’t gather any data during specimen broken. We measure an absorbed energy for fracture and shear area from fracture surface after Charpy impact test and a shear area from fracture surface after DWTT. To analyze the results from these toughness tests of dynamic loading type with using fracture mechanics, recently, an instrumented system is installed to these dynamic loading test machines. An instrumented system can measure load and displacement during specimen broken. On the displacement-load curve made with data from an instrumented system, in general, the area in the region before peak-force is the energy for crack initiation while area in the region after peak-force is that for crack propagation. Meanwhile, it takes a long time and effort to evaluate the shear area from both fracture surfaces after Charpy impact test and DWTT test. For Charpy impact test, the method how to calculate the shear area with the information from a load-displacement curve has been studied for a long time. So the method for it is well established and known. For DWTT, however, the method how to calculate the shear area from a load-displacement curve was not known well. In this paper, a shear area could be calculated from an instrumented data without any more time or effort in addition to test. A shear area could be expressed as a function of total absorbed energy, fractured area, maximum force, time at 50kN and time at maximum force. Especially, the material with shear area more than 85% could be distinguished from that with shear area less than 85% because the transition curve of DWTT changes dramatically around 85% shear area.

scholarly journals Change of mechanical properties in substrate during rewelding deposit

2011 ◽  
Vol 57 (No. 3) ◽  
pp. 105-109 ◽  
Author(s):  
R. Chotěborský ◽  
P. Hrabě ◽  
A. Kabutey
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Impact Test ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Optical Metallography ◽  
Coarse Grain ◽  
Low Carbon

A study was carried out to examine the influence of rewelding deposit of structural low carbon steel and also the changes which occur in heat-affected zone and subcritical zone during rewelding. Optical metallography, microhardness Vickers method and Charpy impact test were employed to analyze these differences. The results show that rewelding deposit increased the heat-affected zone and fine coarse grain heat-affected zone and also has influence on impact toughness of substrate and their microhardness. Again, it was found that rewelding increased the fine coarse grain heat-affected zone. This effect resulted in increasing impact toughness in the heat-affected zone. However, submicroscopic change in substrate ferrite showed decreasing impact toughness.

scholarly journals KARAKTERISTIK ENGINE MOUNTING PADA TEMPERATUR AUSTENISASI TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO

POROS ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 35
Author(s):  
Garth Raditya ◽  
Erwin Siahaan ◽  
Abrar Riza
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Impact Test ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Test Results ◽  
Low Carbon ◽  
Hardness Testing ◽  
Microstructure Observation

Engine mounting is one of the car component which is has optimize function to obtain thesystem in the car is extremely perfect. The engine mounting has to be have behavior ductile by strongestenough to support the car engine whether in rest and moving position. To obtain car engine mountingwhich has these function it has to be treated by treatment. The method was used by using Heat TreatmentSystem which we were Hardening and Tempering. Heat treatment of engine mounting is needed toanalyze the microstructure and mechanical properties of low carbon steel used. Tests carried out attemperatures of 800oC, 850oC, 900oC and normal conditions without heat treatment. Then continued withimpact charpy testing, vickers hardness testing, microstructure observation using microscope and SEM.The tests are carried out in accordance with ASTM E23, ASTM E92, ASTM A370 standards. The Vickerstest results provide the lowest HV value of 118.7Hv at 900oC, while the normal condition is at 137.409Hv.The charpy impact test results give the lowest value of 0.06 j / mm2 under normal conditions, while at900oC at 0.0962 j / mm2. The results with microscopy and SEM, the greater the temperature given to heattreatment, the less pearlite will be, while the amount of ferrite and austenite increases which makes theengine mounting more toughness.

The Experimental Verification of the Impact of Regrind on Mechanical Properties of Thermoplastics

2013 ◽  
Vol 816-817 ◽  
pp. 13-17
Author(s):  
Lydia Sobotova ◽  
Miroslav Badida ◽  
Ľudmila Dulebová ◽  
Zdenka Dzoganova
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Experimental Testing ◽  
Pollution Abatement ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Basic Material ◽  
Polybutylene Terephthalate ◽  
Technological Waste ◽  
The Impact

Concerning with an actual situation in the exploitation of technological waste, this contribution deals with the properties analysis of moulded parts made of thermoplastics containing added regrind. The aim of the experiments was to analyze mechanical properties of plastics with various percentage of added regrind into basic material. Material PBT (polybutylene terephthalate), mineral composite with 30% glass fiber, was used for experimental testing. The plastics specimens were made by injection moulding and tested by chosen mechanical properties. The yield of tested material had tendency to decline with added amount of regrind. Addition of regrind had no impact on change of tensile strength and hardness of tested materials with regrind. The values of Charpy impact test had decreasing tendency with increasing rate of regrind. The utilization of regrind at the production of new moulded parts is important from aspect of reduction plastics waste and pollution abatement of environment.

Characterization of Carbon Composites Properties for Application in Sport Industry

2015 ◽  
Vol 1120-1121 ◽  
pp. 515-518 ◽  
Author(s):  
Ladislav Fojtl ◽  
Soňa Rusnáková ◽  
Milan Žaludek ◽  
Alexander Čapka ◽  
Vladimír Rusnák
Keyword(s):  
Mechanical Properties ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Carbon Composites ◽  
Impact Performance ◽  
Number Of Layers ◽  
Sport Industry ◽  
Composite Samples

In the present work, mechanical properties of prepreg carbon composites are studied. Five types of composite samples with different number of layers and prepreg material corresponding to material composition used for carbon rims are manufactured by compression molding. Prepared composites are tested and compared with respect to flexural strength and modulus. Furthermore, impact performance using Charpy impact test is also evaluated.

Effects of Cooling Rate on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy

2013 ◽  
Vol 284-287 ◽  
pp. 103-107 ◽  
Author(s):  
Shiang Cheng Jeng ◽  
Horng Shing Chiou
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cooling Rate ◽  
Solution Heat Treatment ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Argon Atmosphere ◽  
Heat Treated ◽  
Strength And Toughness

The Ti-6Al-4V alloy were solution heat-treated at 960°C for 1 hour and then cooling by water-quenching immediately and 2 bar argon atmosphere, respectively. After being aged at 550°C for 5 hours, the tensile and Charpy impact test were performed. Based on the results, it is found that the quantity of primary α grains will increasing with decreasing the cooling rate following the solution heat treatment, and which will result in the tensile strength and toughness decreasing. Moreover, the optical and SEM micrographs indicated that the cracks propagated with traversing the prior β grains and propagating along the primary α grain boundaries in both of the tensile and impact fractured specimens. This implies that the strength of α grain boundary is less than that of α grain, which will play an important role on the mechanical properties of tensile strength and toughness.

Changes in the Material Properties of Steel 1.4762 Depending on the Temperature

2016 ◽  
Vol 35 (8) ◽  
pp. 761-767
Author(s):  
Josip Brnic ◽  
Goran Turkalj ◽  
Sanjin Krscanski ◽  
Jitai Niu ◽  
Qiang Li
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Impact Test ◽  
Creep Behaviour ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Experimental Results ◽  
Different Temperatures ◽  
The Difference ◽  
Impact Energies

AbstractThis paper presents the experimental results and analysis of the behaviour of steel 1.4762 at different temperatures. Tensile mechanical properties and creep behaviour were determined using uniaxial tests. Charpy impact test was used to determine impact energies at different temperatures. The mentioned mechanical properties are displayed as engineering stress–strain diagrams while material resistance to creep is presented in the form of creep curves. Based on Charpy impact energy an assessment of fracture toughness is given. Experimental results show that the values of mechanical properties are continuously decreased by increasing the temperature. After the temperature of 623 K (tensile strength: 468 MPa; yield strength: 298 MPa) the decrease of the ultimate strength and yield strength is especially emphasized and the difference between them becomes smaller. The creep resistance is considered quite small, except at low stress levels.

scholarly journals Evaluation of mechanical properties of gas pipeline DN 500 after more than 40 years of its operation

2018 ◽  
Vol 62 (4) ◽  
pp. 115-120
Author(s):  
M. Hagarová ◽  
D. Jakubéczyová ◽  
G. Baranová ◽  
M. Fujda
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Impact Test ◽  
Charpy Impact ◽  
Charpy Impact Test ◽  
Gas Pipeline ◽  
Charpy Test ◽  
Steel Sheets ◽  
Static Tensile ◽  
Parallel Direction

Abstract The paper deals with the mechanical properties of steel gas pipeline DN 500 after more than 40 years of operation. Mechanical properties of the pipeline were established by a tensile test at an ambient temperature according to the standard EN ISO 6892-1. The resistance of the pipeline against brittle failure was evaluated by using Charpy impact test according to EN 10045-1. The character of fracture surface after the Charpy test was analysed by using scanning electron microscopy. A high proportion of transcrystalline cleavage was a characteristic feature of fracture surfaces. Mechanical characteristics obtained by static tensile testing were compared with the values obtained from steel manufacturer. Higher elongation was observed in a parallel direction compared to the perpendicular direction to the axis of the pipe. The observed anisotropy of properties was related to the distribution of inclusions in the direction of the deformation of the steel sheets used for the pipeline construction.

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