Effects of prior cold working on low cycle fatigue behavior of stainless steels, titanium alloy timetal 834 and superalloy IN 718: A review

Abstract

This paper gives a brief review of the efforts made to study the effects of cold rolling on low cycle fatigue (LCF) behavior of stainless steels,titanium alloy Timetal 834 and Ni-Fe based Super alloy IN 718 at different temperatures and different strain amplitudes. Low Cycle Fatigue tests on cold worked 316L stainless steel at various temperatures from room temperature to 923K have been reported. In all tests the effect of 20% prior cold work(PCW) on LCF behavior of type 316L (N) stainless steel had been studied at 873K under total axial strain controlled mode in air at strain amplitudes from ±0.25% to ±1.0%. Fatigue life in the solution annealed condition was similar to that of the PCW material at higher strain amplitudes (t0.5%) while at lower strain amplitudes the PCW material exhibited longer life. The influence of PCW on LCF behavior of type 304 and AISI 304LN stainless steel was studied at various temperatures and it was observed that the fatigue life was strongly dependent on prior cold work, temperature, and strain amplitude employed. Cold rolling of the titanium alloy Timetal 834 and age hardenable Ni-Fe-based superalloy IN 718 has been found to cause marked enhancement in LCF life at low strain amplitude and eliminate the bilinearity from the Coffin-Manson(C-M) relationship. Work carried on this aspect,however is very limited particularly in the case of Titanium alloys and Ni-Fe based Superalloy IN 718

Microstructure and Texture of Pure Copper under Large Compression Deformation and Different Annealing Times

“…These methods have the common advantage of being continuously repeatable experiments that can refine grain sizes until ultra-fine grains are produced [19][20][21][22]. In the original organization, there were a large number of small-angle grain boundaries.…”

Investigation of Low Cycle Fatigue Behaviors of Inertia-Friction-Welded Joints of the TC21 Titanium Alloy

“…For LCF, the fracture occurs under a larger load and fewer cycles. Therefore, it is very important to predict and prevent the fatigue fracture due to low cycle fatigue behavior in practical applications [16,17]. In this paper, in order to understand the actual service condition of IFW joints of the TC21 titanium alloy, the mechanical properties and low cycle fatigue behaviors of the IFW joints were studied.…”

Distribution of Cr atoms in a strained and strain-relaxed Fe89.15Cr10.75 alloy: a Mössbauer effect study

“…Cold working has, however, negative sides, too. For example, it reduces ductility and fracture toughness [4] as well as the fatigue life of components manufactured from a pre strained materials [3]. In terms of industrial production and macroscopic properties of stainless steels it is of vital importance to establish relationship on one side between microstructure and texture in metal working processes and the process conditions such as strain, strain rate, temperature of deformation and annealing on the other side.…”

“…[2]. Cold worked steels are considered as appropriate materials to be used as components in the nuclear industry due to their high resistance to radiation-induced void-swelling [3]. Cold work may be also introduced unintentionally into devices of complex geometry such as vessels, tanks, pipes, heat exchangers, boilers etc.…”