Paper Title:
An Evaluation of Thermal Fatigue Cracking and Chemical Reaction in Die Casting Mould
  Abstract

It is well known that the main failure mechanisms in die-casting mould are heat checking due to thermal fatigue and melt-out caused by chemical reaction between die and molten alloys. Thermal fatigue tests were carried out using the thermal cycle simulator to establish the proper method to estimate the thermal fatigue resistance of hot die steel. In this study, the thermal shock tester consisted of induction heating and water spray cooling unit was constructed to evaluate thermal crack propagation resistance and the sum of crack length per unit specimen length, Lm is proposed as the index representing the susceptibility to crack initiation and propagation. Also, new concept of measurement for the melt-out behavior was suggested. AISI H13 hot work tool steel was solution treated and tempered at various temperatures, to control the hardness and toughness that have effect on the behavior of thermal crack propagation. The result of thermal fatigue test showed that there is optimum value of hardness and impact energy to maximize the thermal crack propagation resistance. The influence of nitriding on melt-out resistance was also investigated. The dissolution rate due to melt-out phenomenon tended to be smaller for thicker compound layer. Furthermore, the resistance to melt-out was affected by the compound layer thickness rather than that of diffusion layer. The results of the both tests properly reflect the effect of materials properties on failure modes of die-casting mould and it means those test methods are suitable to evaluate the durability of hot work tool steel for die-casting.

  Info
Periodical
Key Engineering Materials (Volumes 345-346)
Edited by
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
Pages
701-704
DOI
10.4028/www.scientific.net/KEM.345-346.701
Citation
K. T. Youn, Y. M. Rhyim, J. H. Lee, C. G. Lee, Y. C. Jung, "An Evaluation of Thermal Fatigue Cracking and Chemical Reaction in Die Casting Mould", Key Engineering Materials, Vols. 345-346, pp. 701-704, 2007
Online since
August 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Kuk Tae Youn, Young Mok Rhyim, Jong Hoon Lee, Young Sang Na, Wee Do Yoo, Chan Gyu Lee
Abstract:For hot die steel, failure is mostly caused by heat checking and melt-out on its surfaces which are in contact with molten metals. In the...
443
Authors: Jiang Liu
Abstract:Through the reaction model of Fe powder in liquid Al melt, constructed the dynamic model of Al-Fe reaction and analyzed it’s forming kinetics...
289
Authors: Bong Hwan Kim, Sang Mok Lee
Chapter 1: Advanced Processing Technology
Abstract:This study aims to investigate the effects of mechanical melt-shearing treatment during casting process on the morphological change of...
160
Authors: Bong Hwan Kim, Sang Hwan Lee, Sang Mok Lee
Chapter 18: Joining Processes
Abstract:This study aims to investigate the influence of intermetallics morphological modification on mechanical properties of iron-containing...
4683
Authors: Bin Yang, W.M. Mao, Jian Nan Zeng, Xiao Jun Song
Chapter 4: Process Development
Abstract:The semi-solid slurry of 7075 aluminum alloy was prepared by using an innovative non-stirring technology that can be called inverted...
415