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Title: Improvement To The Fatigue Strength Of Drop-forged Specimens By Airless Blast Cleaning
Author: Kloos, Kaiser, Oppermann
Source: Conf Proc: ICSP-3, (p.533-540)
Publication year 1987
Document number: 1987046
Number of pages: 7
Abstract:
Drop-forged components are usually airlessly blast cleaned after heat treatment in order to remove the oxide scales. It has been shown in many investigations that this type
of treatment also offsets the negative influence of decarburization because it causes strain hardening and introduces residual compressive stresses. The interaction between
the shot and the structure of the oxide scales is comprehensively investigated.
T
he results were obtained during "Increasing the Fatigue Strength of
Drop-forged Components by Means of a Defined Peening Treatment" research project. The objective of this work was first to carry out an investigation into the influence of
the type of shot, the shot hardness, the peening time and the shot size on the bending fatigue behaviour (R = 0) of the material Ck 45 V (R[m] = 813 N/mm[2]). The optimum
peening conditions thus found were then applied to other typical forge alloys after usual heat treatments. The peening was applied to the decarburized surfaces with oxide
scales which typically appear after forging and the various heat treatments.
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