By R.A. Mesquita and G.E. Totten, L.C.F. Canale, R.A. Mesquita, G.E. Totten
This useful reference presents particular specialise in metal disasters to assist determine reason, hinder destiny prevalence, and enhance reliability. The breadth of assurance and the various examples supply a useful source for the clothier, engineer, metallurgist, mechanical and fabrics engineers, quality controls technicians, and warmth treaters. Many examples of warmth therapy disasters are supplied with precise specialise in the calls for of device Steels and Aerospace fabrics.
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Additional info for Failure Analysis of Heat Treated Steel Components
40 Energy-dispersive x-ray spectroscopy spectra of (a) the base metal of the screw and (b) the plating on the outside surface. Source: Ref 20 results are shown in Fig. 40. It was determined that the screws were plated with cadmium. Superficial Rockwell hardness measurements were taken on the metallographic section. The average hardness for the failed cap screw was Fig. 39 SEM micrograph showing an intergranular fracture mode, observed around the entire circumference at both fractures in the screw.
The core (Fig. 29) had a banded microstructure of ferrite and pearlite and contained some MnS inclusions. The case (Fig. 30) showed a tempered martensite matrix with a nearly continuous grain-boundary network of cementite. Other cracks started on the surface caused by the cementite network (Fig. 31). All cracks progressed inward from the carburized surface and circumferentially around the pin. Hardness tests were performed on the cross section of the pin, and the depth of case penetration to a value of 50 HRC was measured.
After the cooling processes have been completed, the residual-stress distribution between the surface and core is obtained. If the surface stresses exceed the hot yield strength of the material, it plastically deforms, resulting in thermally induced dimensional changes and thermal and transformational stresses. In heat treated parts, residual stresses may be classified as those caused by a thermal gradient alone and a thermal gradient in combination with a microstructural change (phase transformation).
Failure Analysis of Heat Treated Steel Components by R.A. Mesquita and G.E. Totten, L.C.F. Canale, R.A. Mesquita, G.E. Totten