Residual stress mapping along the cylinder bores of Al alloy engine blocks subjected to production solution heat treatment schedule

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.4271/2014-01-0837
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Name affiliation
  1. National Research Council Canada. Security and Disruptive Technologies
FormatText
TypeArticle
Journal titleSAE International Journal of Materials and Manufacturing
ISSN1946-3979
Volume7
Issue2
Pages415–420; # of pages: 6
SubjectAluminum cylinders; Axial orientations; Current production; Cylinder bore; Engine blocks; Heat treatment schedule; Solution heat treatment; Tensile residual stress; Aluminum; Cast iron; Engines; Heat treatment; Neutron diffraction; Residual stresses; Cylinder blocks
Abstract
The development of an optimized heat treatment schedule, with the aim of maximizing strength and relieving tensile residual stress, is important to prevent in-service cylinder distortion in Al alloy engine blocks containing cast-in gray iron liners. However, to effectively optimize the engine block heat treatment schedule, the current solutionizing parameters must be analyzed and compared to the as-cast condition to establish a baseline for residual stress relief. In this study, neutron diffraction was carried out to measure the residual stress along the aluminum cylinder bridge following solution heat treatment. The stresses were measured in the hoop, radial and axial orientations and compared to a previous measured as-cast (TSR) engine block. The results suggest that solution heat treatment using the current production parameters partially relieved tensile residual stress in the Al cylinder bridge, with stress relief being more effective near the bottom of the cylinder.
Publication date
PublisherSAE International
LanguageEnglish
Peer reviewedYes
NPARC number21275448
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