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Title: Microstructure Aspects Of Work-softening Phenomenon For Steel And Aluminum
Author: Hailin, Mingzhi, Jiawen, Iida
Source: Conf Proc: ICSP-4, (p.227-232)
Publication year 1990
Document number: 1990043
Number of pages: 6
Abstract:
Experiments were designed to reveal the nature of work softening aspect of shot peening. A steel specimen is compressed in different strains and then tensiled. The half
width decreases to a minimum value and increases again, that agrees with the hardness distribution of a softened layer of peened specimen. Microstructure analysis of A1
specimen shows the reverse loading makes the cell structure indistinct and forms dislocation networks, but in further loading, the well formed cells establish again thus the
material becomes hardened. Below the strain threshold of softening, the material increases its half width under cyclic loading, but its residual stresses decay with the
cycle number.
Descriptors: Half width; Softening; Shot peening
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