123 Effect of Heat Treatment Conditions on Static Tensile Strength and Fatigue Strength in Carbon Tool Steel SK85

2007 ◽  
Vol 2007 (0) ◽  
pp. 45-46
Author(s):  
Anggit MURDANI ◽  
Chobin MAKABE ◽  
Kazuo KUNIYOSHI ◽  
Tatsjiro MIYAZAKI ◽  
Toshiyasu SUEYOSHI
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Tool Steel ◽  
Treatment Conditions ◽  
Static Tensile

scholarly journals Heat Treatment Evaluation for the Camshafts Production of ADI Low Alloyed with Vanadium

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1036
Author(s):  
Eduardo Colin García ◽  
Alejandro Cruz Ramírez ◽  
Guillermo Reyes Castellanos ◽  
José Federico Chávez Alcalá ◽  
Jaime Téllez Ramírez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Ductile Iron ◽  
Volume Fraction ◽  
Energy Impact ◽  
Treatment Conditions ◽  
Mold Casting ◽  
Grade 3 ◽  
Good Agreement

Ductile iron camshafts low alloyed with 0.2 and 0.3 wt % vanadium were produced by one of the largest manufacturers of the ductile iron camshafts in México “ARBOMEX S.A de C.V” by a phenolic urethane no-bake sand mold casting method. During functioning, camshafts are subject to bending and torsional stresses, and the lobe surfaces are highly loaded. Thus, high toughness and wear resistance are essential for this component. In this work, two austempering ductile iron heat treatments were evaluated to increase the mechanical properties of tensile strength, hardness, and toughness of the ductile iron camshaft low alloyed with vanadium. The austempering process was held at 265 and 305 °C and austempering times of 30, 60, 90, and 120 min. The volume fraction of high-carbon austenite was determined for the heat treatment conditions by XRD measurements. The ausferritic matrix was determined in 90 min for both austempering temperatures, having a good agreement with the microstructural and hardness evolution as the austempering time increased. The mechanical properties of tensile strength, hardness, and toughness were evaluated from samples obtained from the camshaft and the standard Keel block. The highest mechanical properties were obtained for the austempering heat treatment of 265 °C for 90 min for the ADI containing 0.3 wt % V. The tensile and yield strength were 1200 and 1051 MPa, respectively, while the hardness and the energy impact values were of 47 HRC and 26 J; these values are in the range expected for an ADI grade 3.

scholarly journals Achievement of High Strength and Ductility in Al–Si–Cu–Mg Alloys by Intermediate Phase Optimization in As-Cast and Heat Treatment Conditions

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 647 ◽  
Author(s):  
Bingrong Zhang ◽  
Lingkun Zhang ◽  
Zhiming Wang ◽  
Anjiang Gao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Intermediate Phase ◽  
High Strength ◽  
Mg Alloys ◽  
Artificial Ageing ◽  
Treatment Conditions ◽  
Eutectic Si

In order to obtain high-strength and high-ductility Al–Si–Cu–Mg alloys, the present research is focused on optimizing the composition of soluble phases, the structure and morphology of insoluble phases, and artificial ageing processes. The results show that the best matches, 0.4 wt% Mg and 1.2 wt% Cu in the Al–9Si alloy, avoided the toxic effect of the blocky Al2Cu on the mechanical properties of the alloy. The addition of 0.6 wt% Zn modified the morphology of eutectic Si from coarse particles to fine fibrous particles and the texture of Fe-rich phases from acicular β-Fe to blocky π-Fe in the Al–9Si–1.2Cu–0.4Mg-based alloy. With the optimization of the heat treatment parameters, the spherical eutectic Si and the fully fused β-Fe dramatically improved the ultimate tensile strength and elongation to fracture. Compared with the Al–9Si–1.2Cu–0.4Mg-based alloy, the 0.6 wt% Zn modified alloy not only increased the ultimate tensile strength and elongation to fracture of peak ageing but also reduced the time of peak ageing. The following improved combination of higher tensile strength and higher elongation was achieved for 0.6 wt% Zn modified alloy by double-stage ageing: 100 °C × 3 h + 180 °C × 7 h, with mechanical properties of ultimate tensile strength (UTS) of ~371 MPa, yield strength (YS) of ~291 MPa, and elongation to fracture (E%) of ~5.6%.

Prevention of Fracture of Cracked Steel Bars Using Laser: Part III—Case of High Carbon Steel

1988 ◽  
Vol 110 (4) ◽  
pp. 319-324
Author(s):  
Akira Kato
Keyword(s):  
Tensile Strength ◽  
Fatigue Strength ◽  
Carbon Steel ◽  
Laser Welding ◽  
Base Metal ◽  
High Carbon Steel ◽  
High Carbon ◽  
Bending Fatigue ◽  
Static Tensile ◽  
Bending Fatigue Strength

The effect of laser welding on prevention of the fracture of cracked shafts of a high carbon steel are presented. Static tensile strength and rotary bending fatigue strength were obtained using shaft specimens of AISI W1 which were welded by a CO2 laser around a precrack. Since the welded region became extremely hard and brittle, both the strengths of laser-welded specimens were lower than those of non-welded specimens. However, the strengths were increased higher than those of non-welded specimens after tempering the specimens. It was found that when tempered at 600°C after laser welding, the rotary bending fatigue strength of specimens with a crack smaller than 12 mm rose similar to that of the base metal, and when tempered at 700° C, the static tensile strength of specimens with a crack smaller than 12mm rose similar to that of the base metal. Therefore, it was shown that the laser welding is very effective to prevent fracture of high carbon steels.

scholarly journals The Effect of Heat Treatment on the Mechanical Properties of SAE 1035 Steel

2016 ◽  
Vol 8 ◽  
pp. 32-43
Author(s):  
Osita Obiukwu ◽  
Henry Udeani ◽  
Progress Ubani
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Carbon Steel ◽  
Endurance Limit ◽  
Tensile Tests ◽  
Treatment Processes ◽  
Treatment Conditions ◽  
Hardness Tests ◽  
Heat Treated

The effect of various heat treatment operations (annealing, normalizing, tempering) on mechanical properties of 0.35% carbon steel was investigated. The change in the value of endurance limit of the material as a result of the various heat-treatment operations were studied thoroughly. It was found that the specimens tempered at low temperature (200°C) exhibited the best fatigue strength. Microscope was used to characterize the structural properties resulting from different heat treatment processes. The results from the tensile tests impact tests and hardness tests showed that the mechanical properties variate at every heat-treatment conditions. The microstructure of differently heat-treated steels was also studied.

The Interplay of Geometric and Materials Variables in Energy Absorption

1977 ◽  
Vol 99 (2) ◽  
pp. 114-120 ◽  
Author(s):  
P. H. Thornton ◽  
C. L. Magee
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Energy Absorption ◽  
Axial Compression ◽  
Specific Energy ◽  
Uniform Elongation ◽  
Unit Weight ◽  
Treatment Conditions ◽  
Cylindrical Tubes

The specific energy absorbed during uniaxial tension and during axial compression of cylindrical tubes with various wall thicknesses and diameters has been measured for 1015 steel in two heat treatment conditions and for 6061 aluminum alloy in four heat treatment conditions. For axial compression of tubes, the energy absorbed/unit weight, Esc, is a function of the thickness to diameter ratio and the present work shows that for 0.02 < t/D < 0.1, the dependence is well described by a power law of the form Esc = A(t/D)m where m varies between 0.5 and 1.0 for different materials. A salient finding is that the ranking of materials for specific energy absorption depends upon the testing mode. In tension, it is shown that density ρ, ultimate tensile strength σult and the uniform elongation, εu are significant in the ranking of materials. Specifically, the present and previous results show that the energy absorbed/unit weight, depends upon both the ultimate tensile strength σult and the corresponding true (tensile) strains εu, EsT = σult εu/ρ(1 + εu). In axial compression, however, the measured variations in Esc (for a fixed geometry) with the different materials show that Esc is simply proportional to the specific ultimate tensile strength (σult/ρ). The magnitude of the tensile uniform elongation is unimportant in ranking materials for this compression collapse mode because the geometric instability present in tension tests does not arise in the plastic buckling process that occurs during the axial compression of cylinders.

Influence of Laser Process on Mechanical Behavior during Cutting of Carbon Fiber Reinforced Plastic Composites

2014 ◽  
Vol 783-786 ◽  
pp. 1518-1523 ◽  
Author(s):  
Yoshihisa Harada ◽  
Mayu Muramatsu ◽  
Takayuki Suzuki ◽  
Michiteru Nishino ◽  
Hiroyuki Niino
Keyword(s):  
Tensile Strength ◽  
Fatigue Strength ◽  
Carbon Fiber ◽  
Laser Cutting ◽  
Material Behavior ◽  
Resin Matrix ◽  
Fiber Reinforced ◽  
Static Tensile ◽  
Carbon Fiber Reinforced ◽  
Mechanical Cutting

Carbon fiber-reinforced plastics (CFRP) composite is most attractive materials to reduce the weight of transportations. To increase the production volume and the efficiency in the field of CFRP component, fast, highly precise and cost-efficient technologies are required. Although laser cutting meets these requirements, it is not used because of insufficient knowledge about the effect of thermal damage on the material behavior. In this study, the effect of several cutting processes on the static tensile strength and the fatigue strength was evaluated for CFRP consisting of thermoset resin matrix and carbon fibers. The CFRP was cut using two different-type of lasers; a CO2 gas laser and single-mode fiber lasers, and a conventional mechanical tool. The mechanical cutting specimen produced a cut of high quality. While, the laser cutting specimens clearly showed a heat-affected zone (HAZ). The static tensile strength and the fatigue strength by laser cutting specimens clearly decreased in comparison with mechanical cutting specimen. The laser cutting specimen exhibited a linear dependency of the tensile strength on the HAZ, indicating that the main effect resulted from thermal destruction of CFRP within the HAZ.

Comment on the Effect of Proof Stress on Notched Fatigue Strength

1963 ◽  
Vol 67 (636) ◽  
pp. 798-799
Author(s):  
E. R. Welbourne
Keyword(s):  
Heat Treatment ◽  
Experimental Investigation ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Elastic Stress ◽  
Proof Stress ◽  
Fatigue Data ◽  
Reversed Loading ◽  
Predicted Values

In his note, Forrest compares the results of an experimental investigation of the notched fatigue strength of HE 15 aluminium alloy (L.64/L.65 type) in three conditions of heat treatment with predicted values obtained using the analysis by Gunn. This analysis appears in R.Ae.S. Fatigue Data Sheets A.00.01 and .02.The analysis requires a minimum knowledge of four parameters, Kt’ the elastic stress concentration factor, ft the tensile strength, ƒp the 0·1 per cent proof stress and Sao the fatigue strength under reversed loading for the specified endurance Ncycles.

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