Hot Workability Behavior of W360 Hot Work Tool Steel in the Cast and Wrought Conditions
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

In the current study, the hot workability of W360 hot work tool steel was investigated by hot tension testing in the cast and wrought conditions in the temperature range of 900-1200°C at strain rate of 0.1s-1. The results showed that in both cast and wrought steels, ductility has increased with increasing temperature from 900 to 1000°C, due to dissolution of carbides and occurrence of dynamic recrystallization. The most recrystallization has occurred at 1050°C and the size of the grains has decreased. This reduction in wrought steel was more evident due to its smaller primary grain size. Wrought samples showed higher hot ductility and lower peak stress than cast samples. The ductility of cast steel depicted a significant decrease at 1200°C due to the presence of undissolved particles along grain boundaries and the stress concentration and thus formation of granular cracks surrounding them. It is while the breakdown of particles has prevented the stress concentration around them in the wrought steel. According to microscopic images of the samples after the hot tension test, in the wrought samples, the continuous alloyed carbide nets were broken during the rolling and occurrence of recrystallization and the carbides has become smaller and their distribution was more uniform. This issue reduces the stress concentration around the carbides in the wrought samples and thus leads to higher hot workability than the cast one. According to the results, the best hot deformation range of W360 steel was achieved in the temperature range of 1050 to 1150°C for both cast and wrought steels.

Language:
Persian
Published:
Modares Mechanical Engineering, Volume:20 Issue: 7, 2020
Pages:
1923 to 1932
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