Zur Deutung der Gittereigenverformungen in plastisch verformtem α‐Eisen

Abstract

Röntgenographische Untersuchungen an Flachproben aus weichem Thomasstahl mit 0,018% C nach der Erzeugung unterschiedlicher Versetzungsstrukturen durch 23prozentige Zugverformung im Temperaturbereich von 400 bis 650 °C und im Dehngesehwindigkeitsbereich von 10−5 bis 10−2 s−1. Quantitative Kennzeichnung der Versetzungsstrukturen auf Grund der tangential zum Debye‐Scherrer‐Kreis gemessenen Intensitätsverteilung von Röntgeneinzelreflexen. Sichtbarmachung der unterschiedlichen Versetzungsstrukturen mit Hilfe des elektronenmikroskopischen Durchstrahlungsverfahrens. Röntgenographische Messung der Gitterkonstanten mit (310)‐ und (211)‐Interferenzen. Errechnung der sich nach plastischer Verformung ausbildenden Gittereigenverformung für verschiedene Interferenzen und Probenformen.

Determination of single-crystal elastic constants from a cubic polycrystalline aggregate

“…Equations (10) and (11) have been derived by Bollenrath et al (1967). T denotes the tensor component t3333, which was introduced by Kr6ner (1958) to take account of the coupling of a grain to the surrounding matrix; T is given by (12).…”

“…1). The theory also allowed Bollenrath et al (1967) to derive the equations for XEC as as a function of SEC. The latter results may be expressed as…”

The influence of multiaxial stress states, stress gradients and elastic anisotropy on the evaluation of (Residual) stresses by X-rays

“…7. Strong oscillations which have been observed by many authors (Bollenrath, Hauk & Weidemann, 1967;Shiraiwa & Sakamoto, 1970;Marion & Cohen, 1975;Hauk, Herlach & Seseman, 1975;D611e, Hauk & Zegers, 1978), only occur for the rolling direction, ~ = 0. The reason for this effect is a change in the sign of R'~ 3 for the three poles at 0i=0, 19-5 and 35.3 °, see Table 3.…”

“…2a) after grinding (Walburger, 1973;Faninger & Walburger, 1976;Wolfstieg & Macherauch, 1976;Macherauch & Wolfstieg, 1977), or rolling friction (Christ & Krause, 1975;Krause & Jfihe, 1976), or wear (Krause & Jfihe, 1977), and oscillations (see Fig. 2b) may occur in textured materials (Bollenrath, Hauk & Weidemann, 1967;Shiraiwa & Sakamoto, 1970, Marion & Cohen, 1975Hauk, Herlach & Sesemann, 1975). Since the penetration depth of X-rays depends on ~ (Wolfstieg, 1976), strong gradients can cause additional nonlinearities (Shiraiwa & Sakamoto, 1972).…”

Determination of Stress Profiles in Expanded Austenite by Combining Successive Layer Removal and GI-XRD

“…However, the single crystal elastic constants of expanded austenite are yet unknown. Therefore, arbitrarily, hitherto the selfconsistent Kröner-Eshelby model [13] was adopted and values reported for 12%Cr-12%Ni-Fe [14,15] were taken. The implications of choosing these XECs for 200 and 111 reflections of expanded austenite for relating the lattice strain to residual stress are discussed in this work.…”