Transactions of Materials and Heat Treatment

Title：Optimization on heat treatment process after forging of large supporting roller based on numerical analysis of heat treatment

Authors： Lin Hong Liu li

Unit： Chongqing Industry Polytechnic College

KeyWords： numerical analysis of heat treatment large supporting roller heat treatment after forging heat transfer coefficient

ClassificationCode：TG15

year,vol(issue):pagenumber：2015,40(12):141-144

Abstract：

For the fracture failure analysis on the supporting roller of a large mill, it was found that the center segregation, the inhomogeneous microstructure and the resulting residual stress were the main reasons of supporting roller fracture. The heat treatment process after forging of the supporting roller was simulated by Deform. It was discussed the supporting roller's temperature field, stress field and microstructure field under the original heat treatment after forging. It was found that the austenizing time in the middle of supporting roller was less, the temperature was lower after air cooling, and the residual stress was larger after normalizing. The corresponding optimization heat treatment process was put forward, namely, decreasing heat velocity to 10 ℃·h-1, increasing austenizing temperature and time to 930℃ and 30h respectively, increasing temperature after air cooling. The result shows that the optimization process can resolve the lack of austenizing time in the middle of the supporting roller, and reduce the residual stress of heat treatment and fracture risk.

Funds：

作者简介：林洪（1973-），女，本科，讲师

Reference：

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