Non-Steady-State Creep Behavior in Tube Gas Forming

Author: Wu Xin  

Publisher: Springer Publishing Company

ISSN: 1059-9495

Source: Journal of Materials Engineering and Performance, Vol.16, Iss.4, 2007-08, pp. : 418-431

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

A steady-state creep equation is commonly used in the analysis of superplastic forming or other elevated temperature forming processes. However, in Hot Metal Gas Forming of tubes, the effective stress increases as tube diameter expands and wall thickness decreases, and a steady-state creep condition does not exist. Thus, non-steady-state creep behavior of materials becomes important. This paper presents some experimental results on transient creep behavior of a magnesium alloy, and provides an analysis on transient creep behavior and its application in tube forming mechanics. It is verified that non-steady-state creep plays important role in the gas tube forming at elevated temperatures.