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Effect of aging temperature on dimensional in stability of invar alloys

XU WANG1,* , BAOGANG WANG1, WEI DING2, CHENCHONG WANG2, YANHUA SHI1, QIANG GUO3

Affiliation

  1. School of Mechanical Engineering, Liaoning Shihua University, Fushun, Liaoning, 113001, P. R. China
  2. School of Materials Science and Engineering , Harbin Institute of Technology , Harbin, Heilongjiang 150001, P R China
  3. Fushun Special Steel Shares Co., LTD. Fushun, Liaoning, 113001, P. R. China

Abstract

In this article, the effect of aging process on dimensional instabil ity of Invar alloys was analyzed. When the aging temperature range d from 200 to 500 oC, the organization of the Invar alloy was a ustenite phase γ Fe . The residual stress of the Invar alloy also decrease dsignificantly with the increase of the aging temperature . The coefficients of thermal expansion (of he Invar alloy did not change obviously with the increase of the aging temperature when the aging temperature was below 400 oC. However, the CTE of the Invar alloy increase d significantly with the increa se of the aging temperature when the aging temperature was above 400 oC. After aging at 500 oC, the average CTE of the alloys increase d 100% and the dimensional in stability of Invar alloy was bad..

Keywords

Invar alloy , Aging temperature Thermal expansion coefficient Residual stress.

Citation

XU WANG, BAOGANG WANG, WEI DING, CHENCHONG WANG, YANHUA SHI, QIANG GUO, Effect of aging temperature on dimensional in stability of invar alloys, Optoelectronics and Advanced Materials - Rapid Communications, 7, 9-10, September-October 2013, pp.754-759 (2013).

Submitted at: May 21, 2013

Accepted at: Sept. 18, 2013