scholarly journals Low-cycle fatigue behavior of fiber-laser welded, corrosion-resistant, high-strength low alloy sheet steel

2017 ◽  
Vol 121 ◽  
pp. 393-405 ◽  
Author(s):  
J.W. Sowards ◽  
E.A. Pfeif ◽  
M.J. Connolly ◽  
J.D. McColskey ◽  
S.L. Miller ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Sheet Steel ◽  
High Strength ◽  
Alloy Sheet ◽  
Cycle Fatigue ◽  
Corrosion Resistant

scholarly journals On the Low Cycle Fatigue Behavior in the Longitudinally Butt Welded Joints between High Strength Steel and Mild Steel

1977 ◽  
Vol 1977 (142) ◽  
pp. 236-244
Author(s):  
Kinichi Nagai ◽  
Mitsumasa Iwata ◽  
Kenhichiro Kurihara ◽  
Junkichi Yagi ◽  
Yasumitsu Tomita
Keyword(s):  
Mild Steel ◽  
Welded Joints ◽  
High Strength Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue

Low Cycle Fatigue Characteristics of a Low-Thermal Expansion, High Strength Alloy (HAYNES 242 Alloy)

2011 ◽  
Author(s):  
L. M. Pike ◽  
S. K. Srivastava
Keyword(s):  
Thermal Expansion ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Strain Range ◽  
High Strength ◽  
Wave Form ◽  
Cycle Fatigue ◽  
Total Strain Range ◽  
Low Thermal Expansion ◽  
Long Range Ordering

HAYNES® 242® alloy, based primarily on the Ni-25Mo-8Cr system, derives its low thermal expansion characteristics from its composition and its high strength concomitant with high ductility from a long-range ordering reaction upon an aging heat treatment. This combination has enabled the alloy continually to find a challenging range of applications in the aerospace industry at up to 1300°F (704°C). These include seal rings, containment rings, duct segments, casings, rocket nozzles, etc. In conjunction with the creep strength and environmental resistance, the low cycle fatigue (LCF) behavior is an important material property affecting the service life of 242 alloy components. The low cycle fatigue behavior of 242 alloy was studied under fully reversed strain-controlled mode at 800°F (427°C), 1000°F (538°C), 1200°F (649°C) and 1400°F (760°C) using a triangular wave form with a frequency of 0.33 Hz. Results are presented in terms of cycles to crack initiation and failure. The magnitudes of fatigue lives at total strain range ≤ 0.7% at 800, 1000 and 1200°F are significantly greater than those of solid solution strengthened alloys. Additionally, stress-controlled LCF tests were performed at 1200°F (649°C) on 242 alloy as well as 909 alloy (for comparison). The paper will discuss the results of these two test programs.

Comparative Low-Cycle Fatigue Behavior of HAYNES 244 Alloy and Waspaloy

2021 ◽  
Author(s):  
Michael G. Fahrmann
Keyword(s):  
Thermal Loading ◽  
Coefficient Of Thermal Expansion ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Axial Strain ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Cyclic Hardening ◽  
Cycle Fatigue ◽  
Softening Behavior

Abstract HAYNES® 244® alloy was chiefly developed to address the need for high-strength, low coefficient of thermal expansion (CTE) alloys for seal rings and cases in advanced gas turbine engines. In addition to these attributes, adequate resistance to low-cycle fatigue (LCF) due to cyclic thermal and mechanical loading during service is critical for such applications. The isothermal LCF performance of commercially produced 0.5” (12.5 mm) thick, fully heat treated plate products of 244 alloy was evaluated by means of axial strain-controlled (R = −1) LCF tests covering total strain ranges up to 1.25 % (without dwells), at temperatures ranging from 800–1400°F (427–760°C). In addition, the comparative LCF performance of Waspaloy, a well-established alloy for turbine cases, was evaluated under selected, nominally identical test conditions. S-N curves were constructed and fitted by the Coffin-Manson equation, allowing the delineation of regimes controlled by the elastic and plastic response of the material. Fracture surfaces were examined in the scanning electron microscope to identify fatigue crack initiation sites and crack propagation modes. Differences between the alloys are discussed in terms of tensile strength and cyclic hardening/softening behavior. Implications for fatigue performance of these alloys under cyclic thermal loading conditions are discussed as well.

scholarly journals Low-Cycle Fatigue Behavior of 10CrNi3MoV High Strength Steel and Its Undermatched Welds

Materials ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 661 ◽  
Author(s):  
Wei Song ◽  
Xuesong Liu ◽  
Filippo Berto ◽  
Seyed Mohamad Javad Razavi
Keyword(s):  
High Strength Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue

Grain Size Effect on Low Cycle Fatigue Behavior of High Strength Structural Materials

2016 ◽  
Vol 258 ◽  
pp. 269-272
Author(s):  
Ryuichiro Ebara
Keyword(s):  
Grain Size ◽  
Fatigue Strength ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength ◽  
Grain Size Effect ◽  
Cycle Fatigue ◽  
Fracture Surfaces ◽  
Fine Grain ◽  
Number Of Cycles

This paper presents grain size effect on low cycle fatigue behavior of high strength maraging steel with gain size of 20,60 and 100μm and Ti-6Al-4V alloy with grain size of 0.5,1.4 and 5.1μm. Low cycle fatigue strength of the maraging steel depends on grain size in number of cycles up to 103.The smaller the grain size, the higher the low cycle fatigue strength was. Quasci-cleavage fracture surfaces were predominant for material with grain size of 20μm,while intergranular fracture surfaces were predominant for materials with larger grain size in number of cycles lower than 60. Striation was predominant for all tested materials in number of cycles higher than 60.Low cycle fatigue strength of Ti-6Al-4V alloy also depends on grain size in number of cycles up to 104. Grain size dependent transgranular fracture surfaces were predominant for materials with ultra-fine grain size of 0.5μm and fine grain size of 1.4μm.

Low Cycle Fatigue Behavior of High-Strength Structural Steel under Biased Strain Control

2011 ◽  
Vol 71-78 ◽  
pp. 4020-4025 ◽  
Author(s):  
Yun Rong Luo ◽  
Yi Guo ◽  
Qing Yuan Wang ◽  
Yong Jie Liu
Keyword(s):  
Structural Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Failure Mechanisms ◽  
High Strength ◽  
Cyclic Softening ◽  
Cycle Fatigue ◽  
Strain Control ◽  
Mean Stress Relaxation ◽  
Constant Maximum

The low cycle fatigue (LCF) behavior of high-strength structural steel under biased strain control has been investigated. Seven strain ratios with constant maximum strain amplitude were adopted. Significant cyclic softening and mean stress relaxation were observed in all cases. The fatigue life under biased strain control could be well predicted by Coffin-Manson relationship. Fractography by scanning electron microscopy was used to determine the LCF failure mechanisms and fatigue crack propagation modes.

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