Effect of geometry and green density on the anisotropic sintering shrinkage of axisymmetric iron parts. (8th August 2018)

• Record Type: Journal Article
• Authors: Molinari, Alberto; Amirabdollahian, Sasan; Zago, Marco; Larsson, Mats; Cristofolini, Ilaria
• Is Part Of: Powder metallurgy. Volume 61:Number 4(2018)
• Page Start: 267
• Page End: 275
• Publication Date: 2018-08-08
• Subjects: Shrinkage anisotropy -- green density -- geometry; Powder metallurgy -- Periodicals; 671.3705
• DOI: 10.1080/00325899.2018.1483064
• Languages: English
• ISSNs: 0032-5899

Abstract

ABSTRACT: Sintering shrinkage of prior cold compacted iron rings with different geometry (height to wall thickness ratio) and green density in the 6.5–7.3 g/cm 3 range was investigated. It displays a minimum at an intermediate green density. Axial, tangential and radial shrinkages are different, due to the gradients of green density along the axial and the radial directions. Therefore, the effect of height on shrinkage and its anisotropy is the result of their effect on the stress distribution in the green parts during cold compaction, and the resulting green density and deformation experienced by the powder. Anisotropy decreases on increasing shrinkage.