Effect of tempering at subcritical temperatures on the fracture strength of medium carbon structural steel

Failure Analysis of Tower Axle in the Wet Drawing Machine

“…Fig. 3 Microstructure SEM photos of the tower axle fracture (a)morphology of source area of crack; (b)morphology of the first crack propagation region ; (c)morphology of the second crack propagation region ;(d)transient faultAnalysis of 40Cr steel quenched and tempering treatmentAccording to the data[4,5], process for tempering heat treatment is quenching and high temperature tempering. As shown in Fig.4is process diagram of 40Cr[6].…”