Abstract
Model of cleavage fracture: deformation twin creates microcrack in cementite lamella; critical event in fracture process is extension of crack into ferrite under the action of twin and applied stresses. Stress analysis of the model yields fracture stress. Mechnical tests with tension, compression and notched bend specimens at temperatures 4 K < T < 100 K. Evaluation of local fracture stress by finite element analysis. Comparison of theoretical and experimental results.
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