Effects of Cooling Rate from Austenitizing Temperature on Heat Crack Formation of Die Steel for Hot Working

• Ootani Naomichi

  室蘭工業大学大学院

• Tanaka Yuichi

  室蘭工業大学　工博

Bibliographic Information

Other Title

• 熱間加工用金型鋼のヒートクラック形成に及ぼす焼入れ冷却速度の影響
• ネッカン カコウヨウ カナガタ コウ ノ ヒート クラック ケイセイ ニ オヨ

Abstract

  Thermal fatigue behaviors of die steel for hot working were investigated, in which cylindrical test bars with U-notch were directly immersed in Al-alloy melt maintained at 923 K, and then cooled quickly to water. The relation between thermal heat cracking and the cooling rate from the austenitizing temperature was mainly discussed in this study. The number of heat cracks initiated at the notch root increased and the elongation and Charpy impact value decreased as the cooling rate of the quenching decreased. While the maximum crack length was the same for all specimens due to the same tensile strength, the total length of each crack increased as the cooling rate decreased. It has therefore been concluded that raising the toughness and elongation by quenching at a fast cooling rate is effective for improving the die life.

Journal

• Journal of Japan Foundry Engineering Society

  Journal of Japan Foundry Engineering Society 70 (3), 180-185, 1998

  Japan Foundry Engineering Society

Keywords

• thermal fatigue test
• die steel for hot working
• cooling rate
• elongation
• Charpy impact value
• thermal heat crack

Details

• CRID: 1390001206506829184
• NII Article ID: 10002553574
• NII Book ID: AN10514770
• DOI: 10.11279/jfes.70.180
• ISSN: 21855374
• ISSN: 13420429
• NDL BIB ID: 4437163
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4437163
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed