Abstract
The effect of cooling time from 800 to 500℃(t8/5) on the microstructure and properties of HAZ for TMCP890 steel has been investigated using Gleeble- 3800 thermal simulator. The results show that the coarse grain zone of the HAZ exhibits a microstructure consisted of lath martensite with hardness 334-328HV10 as t8/5is 6-20 s. As t8/5is 20-30 s, it shows a microstructure of mixture of lath martensite and lath bainitie with hardness 328-305HV10 and Bsraging from 490 to 510℃. As t8/5is 150-2000 s, it shows a microstructure of lath martensite and granular bainite with hardness about 270HV10 and Bsranging from 530 to 570℃. Michio Inagaki formula is suitable for the t8/5calculation, accordingly with a heat input E value 10-20 k J/cm and T0 range 50-150℃, the hardness of the coarse grain zone could be expected as in a range 318-335HV10.
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