The effect of heat treatment on microstructure and hardness of internal crack healing in a low carbon steel was studied. The internal cracks were produced into the samples by a drilling and compression method. The microstructure of crack healing zone was examined using optical microscopy (OM) and scanning electron microscopy (SEM). The hardness of crack healing zone was measured using a Vickers micro-hardness testing machine (FM-800). The results show that healing temperature plays a more significant role in internal crack healing than holding time. Compared as-quenched samples with as-normalized samples under the same healing parameters, it is found that cooling speed is also an important factor for internal crack healing. The migration and enrichment of iron atoms provide material source for recrystallization and grain growth of crack healing zone. The existence of micro-voids leads to the hardness of the ferrite in the crack healing zone lower than that in the matrix.
It is a complex coupling of multi-physics field for metal deformed flow behavior under the condition of adhesive friction, which has been studied in this paper. In this paper, ring upsetting has been carried out with various press amounts. By comparisons of the transient displacement figure of internal & external metal particles under different press quantities, deformed flow state of metal particles is obtained, and inverse flow is found under the adhesive friction. Based on transient displacement obtained by ring upsetting, the flow orientation of the whole specimen is specifically acquired by means of piecewise cubic hermite polynomial interpolation. In the end, representation model of deformed flow behavior is put forward to illustrating and predicting the flow behavior of metal particles.
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