The effect of specimen size and surface conditions on the local mechanical properties of 14MoV6 ferritic–pearlitic steel

2016 ◽  
Vol 651 ◽  
pp. 810-821 ◽  
Author(s):  
R.M. Molak ◽  
M.E. Kartal ◽  
Z. Pakiela ◽  
K.J. Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Pearlitic Steel ◽  
Specimen Size ◽  
Surface Conditions

Effect of bainitic transformation on the microstructure and wear resistance of pearlitic rail steel

2020 ◽  
Vol 72 (9) ◽  
pp. 1095-1102
Author(s):  
Gustavo Tressia ◽  
Luis H.D. Alves ◽  
Amilton Sinatora ◽  
Helio Goldenstein ◽  
Mohammad Masoumi
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Peer Review ◽  
Rail Steel ◽  
Bainitic Ferrite ◽  
Pearlitic Steel ◽  
Lower Bainite ◽  
Bainitic Transformation ◽  
Content Type ◽  
Pearlitic Rail Steel

Purpose The purpose of this study is to develop a lower bainite structure consists of a dispersion of fine carbide inside plates of bainitic ferrite from chemical composition unmodified conventional pearlitic steel under bainitic transformation and to investigate its effect on tensile properties and wear resistance. Design/methodology/approach A commercial hypereutectoid pearlitic rail steel was subjected to three different bainitic transformation treatments followed by tempering to develop a desirable microstructure with a DIL805 BÄHR dilatometer. A comprehensive microstructural study was performed by scanning electron microscopy and energy dispersive x-ray spectroscopy. Finally, the mechanical properties and wear resistance were evaluated by tensile, microhardness, and pin-on-disc tests. Findings The results showed that the best combination of mechanical properties and sliding wear resistance was obtained in the sample subjected to bainitic transformation at 300°C for 600 s followed by tempering at 400°C for 300 s. This sample, which contained a bainitic ferrite structure, exhibited approximately 20% higher hardness and approximately 53% less mass loss than the as-received pearlitic sample due to the mechanically induced transformation in the contact surface. Originality/value Although pearlitic steel is widely used in the construction of railways, recent studies have revealed that bainitic transformation at the same rail steels exhibited higher wear resistance and fatigue strengths than conventional pearlitic rail at the same hardness values. Such a bainitic microstructure can improve the mechanical properties and wear resistance, which is a great interest in the railway industry. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2019-0282/

Effect of Annealing Temperature on Mechanical Properties of Cold Drawn Pearlitic Steel Wires

2006 ◽  
Vol 118 ◽  
pp. 31-34 ◽  
Author(s):  
Won Jong Nam ◽  
Hyung Rak Song ◽  
Kyung Tae Park
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Pearlitic Steel ◽  
High Annealing Temperature ◽  
Annealing Temperatures ◽  
Steel Wires ◽  
High Annealing

The effects of annealing temperature and annealing time on mechanical properties of cold drawn pearlitic steel wires containing 0.84wt% of silicon were investigated. Annealing treatment was performed on cold drawn steel wires for the temperature range of 200°C to 450°C with the different annealing time of 30sec, 1min, 15min and 1hr. The increase of tensile strength at the low annealing temperatures would be related with strain ageing behavior, while the decrease of tensile strength at the high annealing temperature is due to the spheroidization of cementite plates and the occurrence of recovery of the lamellar ferrite in the pearlite.

scholarly journals Mechanical Properties of Gelcast Cerium Dioxide From 23 to 1500 °C

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Stephen J. Sedler ◽  
Thomas R. Chase ◽  
Jane H. Davidson
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Cerium Dioxide ◽  
Porous Ceramic ◽  
Specimen Size ◽  
Strength Data ◽  
Lower Porosity ◽  
Solid Area

This work reports the elastic modulus and four-point flexural strength of a gelcast ceramic, cerium dioxide (ceria), with a microporosity of nominally 20% and a grain size of 11 μm from 23 to 1500 °C. The data augment the sparse data published for ceria and extend previous results by 150 °C. The ceria tested is representative of that constituting the ligaments of a reticulated porous ceramic. The elastic modulus decreases from 90 GPa at 23 °C to 16 GPa at 1500 °C. The flexural strength is 78 MPa below 900 °C and then decreases rapidly to 5 MPa at 1500 °C. These trends are consistent with data reported for other ceramics. Comparing the measured elastic modulus to prior data obtained for lower porosity shows the minimum solid area (MSA) model can be used to extend the modulus data to other porosities. Similarly, the flexural strength data agree with prior data when the effects of specimen size, porosity, and grain size are taken into account.

Influence of Specimen Size on Accelerated Weathering of Laminated Veneer Lumber

2019 ◽  
Vol 69 (1) ◽  
pp. 70-80
Author(s):  
Daniel Way ◽  
Frederick A. Kamke ◽  
Arijit Sinha
Keyword(s):  
Mechanical Properties ◽  
Edge Effect ◽  
Edge Effects ◽  
Total Surface Area ◽  
Specimen Size ◽  
Accelerated Weathering ◽  
Surface Area Ratio ◽  
Constant Length ◽  
Laminated Veneer Lumber ◽  
Durability Assessment

Abstract Moisture intrusion can be significantly higher along specimen edges, particularly at edges where longitudinal grain is exposed, which is referred to as the edge effect. The influence of edge effects on moisture durability are assumed to decrease as the edge area to total-surface-area ratio decreases. Moisture durability assessment of laminated veneer lumber (LVL) is commonly evaluated using accelerated weathering (AW) and outdoor exposure methods, where small specimens are analyzed. The influence of specimen size (i.e., edge effect) on moisture durability evaluation of LVL was investigated in this study. To vary specimen size, three widths with constant length and thickness were evaluated. In addition, three AW methods were used to characterize how the method of inflicting degradation influenced edge effects. No consistent trends in mechanical property loss were found across AW methods, indicating that the influence of specimen size varied with AW method. The greatest influence of specimen size occurred when cyclic vacuum-soak-dry was included, where water absorption decreased significantly with increasing width, and three of four mechanical properties evaluated displayed an influence of specimen size. The smallest influence of specimen size occurred when a single soak-dry procedure was included, where only one of four mechanical properties evaluated displayed an influence of specimen size. Results from this study provide evidence that edge effects may occur during LVL moisture durability assessment but that the severity is dependent on AW conditions.

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