The Effect of Plastic Strain Followed by Aging on the Torsion Fatigue Resistance of Quenched and Tempered 4340 Steel

1978 ◽  
Vol 100 (2) ◽  
pp. 219-220
Author(s):  
John Lyman ◽  
Carroll Madden
Keyword(s):  
Tensile Strength ◽  
Plastic Strain ◽  
Fatigue Limit ◽  
Strain Aging ◽  
Elastic Limit ◽  
High Hardness ◽  
Rotating Beam ◽  
Aged Condition ◽  
Tempered Martensite ◽  
4340 Steel

The torsion fatigue limit of 4340 steel in the quenched and tempered condition is compared with the quenched, tempered and strain-aged condition. Previous experimental work by the authors indicated that strain-aging of tempered martensite of 4340 improved the tensile strength, yield strength and tensile elastic limit. Other workers have shown that the tensile elastic limit and rotating beam fatigue limit of 4340 steel were related at high hardness. The results of this work show that strainaging tempered martensite of 4340 at a hardness of 54-55 Rockwell C does not improve the high cycle torsion fatigue limit.

A Comparison of Tensile Strength and Impact Energy of Austempered versus Step Quenched 4340 Ultra High Strength Steel

2013 ◽  
Vol 553 ◽  
pp. 41-45
Author(s):  
Seyed Majid Safi ◽  
Seyed Yousef Ahmadi Brooghani ◽  
Hossein Amirabadi ◽  
Khalil Khalili ◽  
Mohamad Kazem Besharati Givi
Keyword(s):  
Tensile Strength ◽  
Impact Energy ◽  
High Strength ◽  
Lower Bainite ◽  
Mixed Structure ◽  
Tempered Martensite ◽  
4340 Steel ◽  
Upper Bainite ◽  
Identical Test ◽  
Austempering Temperature

This study was conducted to determine if austempered 4340 steel had different mechanical properties compared to step quenched 4340 steel. Tensile strength and impact energy was determined at room temperature under identical test conditions. The specimens were cut from a bar with 25 mm diameter and austenitized at 800°C for 60 min and followed by quenching at 430°C for the high austempering temperature to achieve the upper bainite morphology and at 360°C for the lower austempering temperature to achieve the lower bainite morphology. In the case of step quenched, the specimens were first austempered at 430°C and then austempered at 360°C to achieve the mixed structure of upper bainite and lower bainite morphology. The another set of specimens for step quenching, after austenitization were quenched to below Ms (martensite start temperature), followed by heating at 400°C to achieve the mixed structure of tempered martensite and lower bainite and 500°C to achieve the mixed structure of tempered martensite and upper bainite. It is also shown that the best combination of strength and ductility can be achieved by the mixed structure of tempered martensite and lower bainite that has been suggested in this investigation.

RMI BETA-C

Alloy Digest ◽  
1987 ◽  
Vol 36 (8) ◽  
Keyword(s):  
Carbon Dioxide ◽  
Tensile Strength ◽  
Base Alloy ◽  
Heat Treating ◽  
Production Equipment ◽  
General Corrosion ◽  
Aged Condition ◽  
Good Resistance ◽  
Solution Treated ◽  
Low Elastic Modulus

Abstract RMI Beta C is a heat-treatable titanium-base alloy that develops a tensile strength of over 200,000 psi in the solution-treated-and-aged condition. It has good ductility and toughness, good fabricability and a low elastic modulus. It has good resistance to general corrosion and it resists hot, aggressive environments containing ferric chloride, sodium chloride, carbon dioxide and hydrogen sulfide. Its applications include coil springs, fasteners, rivets and downhole oil-production equipment. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-87. Producer or source: RMI Company.

A statistical approach to micro-plastic strain in metals

1966 ◽  
Vol 1 (5) ◽  
pp. 415-421 ◽  
Author(s):  
A Esin ◽  
W J D Jones
Keyword(s):  
Plastic Strain ◽  
Elastic Limit ◽  
Statistical Approach ◽  
Physical Reality ◽  
General Concept ◽  
Distribution Functions ◽  
Point Of View ◽  
Plastic Strains ◽  
Statistical Point ◽  
Suggested Approach

The paper presents an outline of a theory of micro-inhomogeneity of stresses and strains resulting from the micro-structural properties of engineering materials. The problem is approached from a statistical point of view and it is experimentally shown that the degree of micro-inhomogeneity can be defined by normal distribution functions. Using the experimental results a general concept is postulated which takes into account the physical reality as completely as is practicable. It is shown that the suggested approach can be used to take into account the micro-plastic strains which exist while the material is nominally within the elastic limit.

scholarly journals Superior Mechanical Behavior and Fretting Wear Resistance of 3D-Printed Inconel 625 Superalloy

2018 ◽  
Vol 8 (12) ◽  
pp. 2439 ◽  
Author(s):  
Yong Gao ◽  
Mingzhuo Zhou
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Additive Manufacturing ◽  
High Hardness ◽  
Fretting Wear ◽  
Inconel 625 ◽  
3D Printed ◽  
Inconel 625 Superalloy ◽  
Electron Beam Selective Melting

Additive manufacturing (AM) nickel-based superalloys have been demonstrated to equate or exceed mechanical properties of cast and wrought counterparts but their tribological potentials have not been fully realized. This study investigates fretting wear behaviors of Inconel 625 against the 42 CrMo4 stainless steel under flat-on-flat contacts. Inconel 625 is prepared by additive manufacturing (AM) using the electron beam selective melting. Results show that it has a high hardness (335 HV), superior tensile strength (952 MPa) and yield strength (793 MPa). Tribological tests indicate that the AM-Inconel 625 can suppress wear of the surface within a depth of only ~2.4 μm at a contact load of 106 N after 2 × 104 cycles. The excellent wear resistance is attributed to the improved strength and the formation of continuous tribo-layers containing a mixture of Fe2O3, Fe3O4, Cr2O3 and Mn2O3.

The Effect of Pre-Strain and Strain Aging on Properties of X100 Line Pipe

2013 ◽  
Vol 690-693 ◽  
pp. 2270-2274
Author(s):  
Qiu Rong Ma ◽  
Hong Da Chen ◽  
Yan Hua Li ◽  
He Li
Keyword(s):  
Tensile Strength ◽  
Impact Toughness ◽  
Yield Strength ◽  
Tensile Properties ◽  
Aging Temperature ◽  
Strain Aging ◽  
Longitudinal Direction ◽  
Line Pipe ◽  
Toughness Test ◽  
The Impact

Tensile and impact toughness test on X100 line pipe with different pre-strain at different aging temperature were conducted to study the effect of pre-strain and aging temperature on properties of X100 line pipe. The result shows that yield strength and tensile strength of X100 line pipe would increase significantly with the introduction of pre-strain, while the impact toughness would decrease significantly. Effect of strain aging on tensile properties of X100 line pipe are more significantly. The yield strength, and tensile strength would increase significantly with the introduction of strain aging both transversal and longitudinal direction.

Effect of TMT Process on the Strength and Precipitation Behavior of an 11Cr-0.3Mo-1.6W Steel during Long Term Aging

2007 ◽  
Vol 345-346 ◽  
pp. 1565-1568
Author(s):  
Sang Min Song ◽  
Woo Sang Jung ◽  
Suk Woo Hong ◽  
Deuck Seung Bae ◽  
Soon Hyo Chung ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Mechanical Treatment ◽  
Laves Phase ◽  
Precipitation Behavior ◽  
Aged Condition ◽  
Nucleation Sites ◽  
Conventional Heat Treatment ◽  
Thermo Mechanical Treatment ◽  
The Difference

The effect of thermo-mechanical treatment (TMT) process on the strength and precipitation behavior of an 11%Cr-0.3Mo-1.6W steel during long term aging was investigated. The major precipitates in as-tempered specimen were identified as M23C6 (M=Fe,Cr) and MX (M=Ta,V;X=C,N). The M23C6 precipitate in TMT sample was more finely distributed due to the increased heterogeneous nucleation sites at dislocations. The tensile strength of TMT sample is higher than that of the conventional heat treatment (CHT) sample in as-tempered condition. However, Laves phase starts to precipitate additionally in the aged condition. The growth rate of Laves phase in TMT sample is much faster than that in CHT sample. Therefore, the difference in tensile strength between CHT and TMT sample decreases as the aging time increases.

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