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An improvement in fatigue behavior of AISI 4340 steel by

Jul 22, 2020 · An evaluation of shot peening, residual stress and stress relaxation on the fatigue life of AISI 4340 steel Int. J. Fatig. , 24 ( 2002 ) , pp. 877 - 886 , 10.1016/S0142-1123(01)00205-5 Article Download PDF View Record in Scopus Google Scholar Evaluation of defect density, microstructure, residual Feb 01, 2015 · 1. Introduction. AISI 4340 steel is widely used in industrial applications because of its toughness, high strength and ability to retain good fatigue strength at elevated temperatures , e.g. in fatigue-critical components, such as the rotor hubs and connecting links of helicopters , , in nuclear power plant structures, high-pressure vessels and reactors and shafts , and it is regarded as one

Evaluation of residual stress relaxation and its effect on

Mar 01, 2013 · On the other hand, the difference of residual stress relaxation between the 3-point and 4-point bending tests can be attributed to the stress concentration effect which is characterized by two different values of the stress concentration factor:K t-3 p = 1.54 and K t-4 p = 1.66. This effect changes the cyclic hardening behavior of the notch Grade 304 Stainless Steel Properties, Tensile Yield AISI 304 Stainless Steel (UNS S30400) AISI 304 stainless steel (UNS S30400) is the most widely used stainless steel, containing 18-20% Cr and 8-10.5% Ni, and also known as 18-8 stainless steel. Type 304 is non-magnetic under annealing conditions, but after cold working (such as stamping, stretching, bending, rolling), part of the austenite structure may be converted into martensite and therefore Sanicro® 28 Sandvik Materials TechnologyDec 10, 2020 · Stress corrosion cracking. Ordinary austenitic steels of the AISI 304 and AISI 316 types are susceptible to stress corrosion cracking (SCC) in chloride bearing solutions at temperatures above about 60°C (140°F). This susceptibility declines with increasing nickel content. Chromium contents above 20% can also be beneficial.

Stainless Steels Alloys:Formability, Fabrication and

May 19, 2005 · Due to work hardening, bending should be done quickly. Some over-bending will be required to counteract spring-back of the bend. The inside bend radius should not be smaller than the thickness of the material being bent. Tube Bending of Stainless Steel. Tube bending is often done for architectural and other applications. Stress Relief - Heat Treat DoctorStress Relief Stress relief is one of the most common heat-treating processes used in spring manufacturing. Like any manufacturing step, if not performed properly this simple operation can have disastrous consequences. Drawing, forming and machining induce stresses in all wire products. These stresses can cause loss of tolerance, cracking Stress relaxation in bending of AISI 316 at 773 K In this article, stress relaxation in bending of AISI 316 stainless steel at 773 K during 490 hours is characterized. Samples were cut either parallel or transverse to the rolling direction and treated at different temperatures prior to the bending tests. The mechanical behavior shown by the longitudinal samples is quite different from that of the transverse samples and so we conclude there

Stress relaxation in bending of type AISI 304 stainless

Stress relaxation in bending of type AISI 304 stainless steel at 773K and 823K . By F. Povolo, R.J. Tinivella, G.B Botteri J.F. Reggiardo and Trieste (Italy) International Centre for Theoretical Physics. Abstract. SIGLEITItal Topics:20K - Solid-state physics The influence of tool micro-geometry on stress The influence of tool micro-geometry on stress distribution in turning operations of AISI 4140 by FE analysis ing and breakage is mostly caused by these bending and tensile stresses that the cutting tool experience [28]. failures of various types that can take place. The mechan-Stress relaxation in bending of type AISI304 stainless Stress relaxation measurements at 773 and 823 K in bending and for different initial stresses in type AISI 304 stainless steel are reported. Several thermal treatments were given to the specimens prior to the relaxation testing. The data are fitted to a general equation that describes thermally activated dislocation motion and it is shown that, in some cases, the internal stress changes with