Tensile Pre-Strain Effects on Torsional Fatigue Properties of Medium Carbon Steels

2005 ◽  
Vol 297-300 ◽  
pp. 1126-1132 ◽  
Author(s):  
Cong Ling Zhou ◽  
Shinichi Nishida ◽  
Nobusuke Hattori ◽  
Wen Xian Sun
Keyword(s):  
Stress Amplitude ◽  
Surface Hardness ◽  
Strain Ratio ◽  
Carbon Steels ◽  
Fatigue Properties ◽  
Crack Initiation And Propagation ◽  
Medium Carbon ◽  
Torsional Fatigue ◽  
Initiation And Propagation ◽  
Medium Carbon Steels

This study was focused on the effects of pre-strain on the torsional fatigue properties of three kinds of medium carbon steels, including the fatigue strength, surface hardness, microstructure, and the crack initiation and propagation behaviors. The effect of pre-strain on the non-propagating cracks was also discussed. The main results obtained in this test are as follows: 1) the fatigue limits increase with the increasing of tensile pre-strain ratio for all kinds of the test materials; 2) under certain stress amplitude, with the increasing of tensile pre-strain ratio, the fatigue crack initiates a little earlier and propagates faster; 3) the length of non-propagating crack decreases with the increasing of tensile pre-strain ratio.

Torsional Fatigue Properties of Pre-strained Low and Medium Carbon Steels

2004 ◽  
Vol 2004.1 (0) ◽  
pp. 189-190
Author(s):  
Congling Zhou ◽  
Shin-ichi Nishida ◽  
Nobusuke Hattori
Keyword(s):  
Carbon Steels ◽  
Fatigue Properties ◽  
Medium Carbon ◽  
Torsional Fatigue ◽  
Medium Carbon Steels

scholarly journals Analysis of the influence of the hydrostatic ball burnishing pressure in the surface hardness and roughness of medium carbon steels

2020 ◽  
Vol 968 ◽  
pp. 012021
Author(s):  
P Fernández-Lucio ◽  
H González-Barrio ◽  
G Gómez-Escudero ◽  
O Pereira ◽  
L N López de Lacalle ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Carbon Steels ◽  
Ball Burnishing ◽  
Medium Carbon ◽  
Medium Carbon Steels

scholarly journals Novel study on mechanical properties of pack carburizing SCM 420 steel with energizer dog conch

2020 ◽  
pp. 2150065
Author(s):  
Ramli ◽  
Chung-Chun Wu
Keyword(s):  
Carbon Source ◽  
Surface Hardness ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Medium Carbon ◽  
Medium Carbon Steels ◽  
Carbonate Source ◽  
Carburizing Process ◽  
Shell Powder

Dog conch shell powder (DCSP) and coconut shell powder (CSP) are used as the calcium carbonate source (energizer) and carbon source, respectively, in the pack carburizing of SCM 420 low carbon steel. The surface hardness of the carburized specimens is investigated for various CSP:DCSP ratios and carburizing temperatures. It is found that a significant improvement in the hardness level is obtained for a DCSP concentration of 40% and a carburizing temperature of 950[Formula: see text]C. It is additionally shown that while DCSP can be used as an energizer in the carburizing process, it cannot be used as an activated carbon source. Finally, it is shown that the surface hardness of the carburized specimens can be significantly improved through a further quenching operation in water. Overall, the results presented in this study confirm the potential for utilizing natural resources such as DCSP and CSP for the pack carburizing of low-to-medium carbon steels.

Observations on the structure at the transformation interface of pearlite in steel

1990 ◽  
Vol 48 (4) ◽  
pp. 200-201
Author(s):  
F. A. Khalid ◽  
D. V. Edmonds
Keyword(s):  
Room Temperature ◽  
Thin Foil ◽  
Carbon Steels ◽  
Model Alloy ◽  
Growth Interface ◽  
Medium Carbon ◽  
Solution Treated ◽  
Medium Carbon Steels ◽  
Alloy Carbide ◽  
Hot Rolled

The austenite/pearlite growth interface in a model alloy steel (Fe-1 lMn-0.8C nominal wt%) is being investigated. In this particular alloy pearlite nodules can be grown isothermally in austenite that remains stable at room temperature, thus facilitating examination of the transformation interfaces. This study presents preliminary results of thin foil TEM of the austenite/pearlite interface, as part of a programme of aimed at studying alloy carbide precipitation reactions at this interface which can result in significant strengthening of microalloyed low- and medium- carbon steels L Similar studies of interface structure, made on a partially decomposed high- Mn austenitic alloy, have been reported recently.The experimental alloys were made as 50 g argon arc melts using high purity materials and homogenised. Samples were hot- rolled, swaged and machined to 3mm diameter rod, solution treated at 1300 °C for 1 hr and WQ. Specimens were then solutionised between 1250 °C and 1000 °C and isothermally transformed between 610 °C and 550 °C for 10-18 hr and WQ.

INCO-WELD C

Alloy Digest ◽  
1996 ◽  
Vol 45 (1) ◽  
Keyword(s):  
Tensile Properties ◽  
Stainless Steels ◽  
Arc Welding ◽  
Carbon Steels ◽  
Alloy Electrode ◽  
Shielded Metal Arc Welding ◽  
Medium Carbon ◽  
Metal Arc Welding ◽  
Spring Steels ◽  
Medium Carbon Steels

Abstract INCO WELD C Electrode is a stainless-alloy electrode especially designed for shielded-metal-arc welding of a broad range of materials, including many difficult-to-weld compositions. It can be used in stainless steels, mild and medium-carbon steels,and spring steels. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on joining. Filing Code: SS-632. Producer or source: Inco Alloys International Inc.

Influence of post-welding tempering on mechanical behavior of friction welded joints from medium-carbon steels during tensile test

2020 ◽  
pp. 40-49
Author(s):  
A. S. Atamashkin ◽  
E. Yu. Priymak ◽  
N. V. Firsova
Keyword(s):  
Mechanical Behavior ◽  
Welded Joints ◽  
Welded Joint ◽  
Crack Nucleation ◽  
Carbon Steels ◽  
Uniaxial Tensile ◽  
Medium Carbon ◽  
Uniaxial Tensile Testing ◽  
Rotary Friction Welding ◽  
Medium Carbon Steels

The paper presents an analysis of the mechanical behavior of friction samples of welded joints from steels 30G2 (36 Mn 5) and 40 KhN (40Ni Cr 6), made by rotary friction welding (RFW). The influence of various temperature conditions of postweld tempering on the mechanical properties and deformation behavior during uniaxial tensile testing is analyzed. Vulnerabilities where crack nucleation and propagation occurred in specimens with a welded joint were identified. It was found that with this combination of steels, postweld tempering of the welded joint contributes to a decrease in the integral strength characteristics under conditions of static tension along with a significant decrease in the relative longitudinal deformation of the tested samples.

Effect of Pre-Strain and Roller Working on Torsional Fatigue Properties of a Structural Steel

2011 ◽  
Vol 295-297 ◽  
pp. 2227-2230
Author(s):  
Cong Ling Zhou
Keyword(s):  
Residual Stress ◽  
Fatigue Limit ◽  
Work Hardening ◽  
Compressive Residual Stress ◽  
Strain Ratio ◽  
Fatigue Tests ◽  
The Other ◽  
Fatigue Properties ◽  
Torsional Fatigue ◽  
Stress Work

In this study, fatigue tests have been performed using two kinds of specimens made of 25 steel. One is pre-strained specimen with pre-strain ratio changing from 2% to 8% by tension, the other is roller worked with deformation of 0.5 mm and 1.0 mm in diameter direction. In the case of pre-strained specimen, the fatigue limit increases according to increase of tensile pre-strain, the fatigue limit of 8% pre-strained specimen is 25% higher than that of non-pre-strained one; in the case of roller worked specimen, the fatigue limit of R05 and R10 is 126% and 143% to that of non-roller worked specimen, respectively. These remarkable improvements of fatigue limit would be caused by the existence of compressive residual stress, work-hardening and the elongated microscopic structures.

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