[1] Zhang D, Harris S J, Mccartney D G, et al. Key words: splittingprocessing, laserpre-controlledcrack, micro-structure, fracturemorphology, micro-hardness, numericalsimulation The corresponding depth range of prefabricated crack is about 3-7 mm. The optimal range of processing parameters is obtained by the experiment and simulation with laser power of 3.0 kW, and scanning speed of 1.0- 4.5 m/min. The cracking mechanism is that the pores and micro-cracks arise at the bottom of the deeper melting zone, and the cracks expand along the center to form the macroscopic cracks. The results show that the hardened brittle cracks are generated in the deeper melting zone due to temperature and stress gradient. The numerical simulation software SYSWELD is used to simulate the distributions of temperature field and stress field in 50SiMnVB steel during laser deeper melting. The laser deeper melting zone of micro-structure, fracture morphology and micro-hardness distribution are analyzed by means of metallographic microscope, scanning electron microscope and micro-hardness tester, respectively. The cracks in 50SiMnVB steel are experimentally controlled by using high power CO 2 laser to improve the processing efficiency and subsequent processing of fracture splitting groove.
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