Void-swelling in irons and ferritic steels: I. Mechanisms of swelling suppression

Kinetics of pearlite spheroidisation during static annealing and during hot deformation

The strain-ageing of steel was reviewed by the writer in 1963 and yield-point and dynamic strain-ageing effects due to substitutional solutes were fully surveyed last year. The present review will be confined to recent work on the effects of strain-ageing by interstitial solutes on the mechanical properties of metals. Quantitative theories of strain-ageing will be treated in a later review.

The effects of strain-ageing due to interstitial solutes on the mechanical properties of metals

Dynamic strain aging in SA508-class 3 pressure vessel steel

Tensile behavior of modified 9Cr–1Mo steel was studied over the temperature range from room temperature (RT) to 600 °C at three strain rates 10 −5 , 10 −4 and 10 −3  s −1  Serrated plastic flow was observed from 250 to 350 °C at strain rate of 10 −4  s −1 , signifying occurrence of dynamic strain ageing (DSA) Characteristic features of DSA such as plateau/peak in yield and tensile strength, minima in ductility, negative strain rate sensitivity, and peak in internal friction were also observed Activation energy for DSA was found equivalent to that for diffusion of nitrogen, hence nitrogen was considered to cause DSA Dislocation substructure in the region of DSA revealed dislocation debris, kinks, bowing of dislocations and high density of dislocations Irrespective of temperature from 200 to 450 °C there was formation of dislocation cell structure; however, cell size in the region of DSA was smallest Fractographic analysis showed rosette type fracture at RT resulting from longitudinal splitting It was associated with decohesion of interface of carbide particles and prior austenite grain boundaries Non uniform and shallow dimples were observed in fibrous zones in the region of DSA Contours of dual shear lip zone were observed at elevated temperatures from 200 to 450 °C

Dynamic strain ageing, deformation, and fracture behavior of modified 9Cr–1Mo steel

Dynamic Strain Aging and the Charpy Specimen Behavior of Annealed 4340 Steel

Rosette or star fracture modes from metallography, electron microscope and continuum mathematical plasticity fracture theory

W. R. Clough

Papers

Dynamic Strain Aging and the Charpy Specimen Behavior of Annealed 4340 Steel

The rosette, star, tensile fracture.

The split, layered, cup-and-cone tensile fracture.

Hackney, Charles. Positive Psychology in Christian Perspective: Foundations, Concepts and Applications