Low temperature normalizing process of nodular cast iron travel wheel

doi:10.13251/j.issn.0254-6051.2022.09.017

Abstract

Abstract: Low temperature normalizing process test of a kind of Cu microalloyed nodular cast iron travel wheel was carried out, and the microstructure and mechanical property data of the flange and spokes of the travel wheel normalized at 850 ℃ and 860 ℃ were obtained. The effect of alloying element Cu on microstructure and properties of nodular cast iron and the change of the temperature range of austenitization and pearlite transformation were analyzed. The results show that 95% pearlite of the nodular cast iron travel wheel can be obtained by normalizing at 850 ℃, reaching fully normalized state, and the mechanical properties meet the requirements of QT650-4 grade. Meanwhile, the microstructure and properties after normalizing at 850 ℃ and 860 ℃ are compared. Although the microstructure and properties after normalizing at 850 ℃ and 860 ℃ can meet the requirements, the surface hardness after normalizing at 860 ℃ is higher than that normalized at 850 ℃, and the mechanical cutting performance is relatively poor. It shows that the temperature window of this travel wheel normalizing process is very narrow. Therefore, it is better to choose the normalizing process at 850 ℃. The heat treatment process has been applied in engineering, and the produced travel wheels have been exported in batches.

Key words: travel wheel, nodular cast iron, low temperature normalizing, mechanical properties, microalloying

CLC Number:

TG164.2

Xiao Jieliang, Sun Hao, Li Fei, Hu Ping, Chen Jinggang, Jiang Zhaofeng. Low temperature normalizing process of nodular cast iron travel wheel[J]. Heat Treatment of Metals, 2022, 47(9): 98-102.

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