Effect of Hardenability on Heat Shock Resistance of Cast Steel Brake Disk

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  • 鋳鋼ブレーキディスクの耐熱衝撃性に及ぼす焼入れ性の影響
  • チュウコウ ブレーキディスク ノ タイネツ ショウゲキセイ ニ オヨボス ヤキイレ セイ ノ エイキョウ

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Recently, the maximum running speed of railway cars and braking load continues to increase leading to the need to improve the heat shock resistance of railway cars disks. <br>  In this study, the heat shock resistance of two materials with different hardenability was compared in the braking tests. <br>  In disks with high hardenabilty, hardness near the friction surface was increased and a few cracks were observed. The white layer was clarified to be martensite. On the other hand, in disks with low hardenabilty, hardness hardly changed and the heat shock resistance was good. The white layer was clarified to be tempered martensite.

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