Author: B. F. JonesPublisher:
ISBN:
Category : Steel
Languages : en
Pages : 14
Book Description
Corrosion Fatigue Crack Growth Rates of Weldments in QIN Steel
Author: B. F. JonesCorrosion Fatigue Growth Rates of Weldments in QiN Steel
Author: B. F. JonesCorrosion Fatigue Crack Growth Rates of Weldments in Q1N Steel
Author: B. F. JonesPublisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
Low frequency fatigue crack growth rates in air and seawater are reported for manual metal arc, synergic metal inert gas, electron beam and laser beam welds in Q1N steel. The stress corrosion crack growth susceptibility in seawater of the weldments was also studied and both the electron beam and laser beam welds exhibited susceptibility whilst the other welds and parent steel did not. All welds except the 'as-welded' laser beam welds showed silmilar fatigue crack growth rates to the parent plate. When tested in seawater the laser beam weld was found to exhibit exceptionally fast crack growth rates. The factors influencing fatigue crack growth in weldments are discussed. (Author).
Scientific and Technical Aerospace Reports
Author: Corrosion Fatigue Crack Growth Thresholds for Cast Nickel-Aluminum Bronze and Welds
Author: EJ. CzyrycaPublisher:
ISBN:
Category : Corrosion fatigue
Languages : en
Pages : 22
Book Description
Fatigue crack-growth rate tests of cast NAB and NAB weld metal specimens were conducted to determine the threshold for fatigue crack growth (?Kth). The tests were conducted in accordance with ASTM E 647, Standard Test Method for Measurement of Fatigue Crack Growth Rates, in artificial seawater at a cyclic frequency of 2 Hz at R-ratios of +0.05, +0.40, and +0.60. The specimens were machined from both poor and good quality, as-cast NAB. Production NAB weldments were used for NAB weld metal specimens.
Corrosion Abstracts
Author: Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 722
Book Description
Fatigue Crack Growth Behavior in Mild Steel Weldments at Low Temperatures
Author: Y. KitsunaiPublisher:
ISBN:
Category : Cleavage
Languages : en
Pages : 19
Book Description
Fatigue crack growth rates for the base metal and welds of SM50A steel weldments were determined at temperatures ranging from room temperature down to 123 K. For the base metal, crack growth rates between room temperature and 188 K decreased slightly with decreasing temperature. At 123 K, the growth rate of the base metal increased markedly because of cyclic cleavage during striation growth. For the welds, no systematic correlation can be made between temperature and growth rate. The growth rates of the welds were lower than those of the base metal regardless of temperature because the crack tips in the weld specimens always existed in the field of compressive residual stresses. Therefore the growth rates of the welds were dominated by residual welding stress rather than temperature. The crack growth rates of the base metal and the welds with residual stresses under low temperatures were closely correlated with the effective stress intensity factor range (?Keff), estimated based on crack closure measurements, when the crack growth mechanism was dominated by striation formation.
The Effects of Environmental and Mechanical Variables on Corrosion Fatigue Crack Growth Rate in a High Strength Steel [Quantitative Understanding of Corrosion Fatigue Crack Growth Rate in a High-strength Steel
Author: Lin DongliangFatigue Behaviour
Author: Ri-ichi MurakamiPublisher:
ISBN:
Category : Metals
Languages : en
Pages : 189
Book Description
Fatigue-Crack Growth in Type 304 Stainless Steel Weldments at Elevated Temperatures
Author: LA. JamesPublisher:
ISBN:
Category : Automotive medicine
Languages : en
Pages : 6
Book Description
The propagation of fatigue cracks in gas-tungsten-arc weldments of Type 304 stainless steel was studied at 75 (24) and 1000 F (538 C). It was found that the crack growth rate for cracks propagating normal to the direction of welding decreased as the crack approached the weld, and then increased as the crack grew through the weld and out the other side. It is postulated that this is due to the residual stresses produced during the welding process, and that metallurgical variations in the weldment play a minor role.