Metalurgija, Vol. 65 No. 4, 2026.
Izvorni znanstveni članak
https://doi.org/https://doi.org/10.64486/m.65.4.2
Study on the Transformation Behavior of Q550D Steel at Continuous Cooling Conditions
Han Weina
; School of Liaoning Provincial Engineering Research Center for High-Value Utilization of Magne-site, Yingkou Institute of Technology, Yingkou 115014, China
Guo Lili
; School of Liaoning Provincial Engineering Research Center for High-Value Utilization of Magne-site, Yingkou Institute of Technology, Yingkou 115014, China
*
Liu Xinyue
; School of Liaoning Provincial Engineering Research Center for High-Value Utilization of Magne-site, Yingkou Institute of Technology, Yingkou 115014, China
Zhang Shikun
; School of Liaoning Provincial Engineering Research Center for High-Value Utilization of Magne-site, Yingkou Institute of Technology, Yingkou 115014, China
* Dopisni autor.
Sažetak
Taking industrial 30 mm-thick Q550D steel as the research object, JMatPro soft-ware was used to simulate and calculate its key parameters, including thermody-namic phase diagram, TTT/CCT curves and mechanical properties. Meanwhile, static thermal simulation tests were conducted to simulate the heat treatment pro-cess under different cooling rates, and corresponding samples were prepared. Mi-crostructure characterization and property tests were carried out using metallo-graphic microscope, Vickers hardness tester and other equipment. Finally, the measured CCT curves were plotted and compared with the simulation results. The results show that the microstructure changes regularly with the cooling rate, and the final microstructure is lath martensite. The microhardness increases sharply at first and then tends to be stable with the increase of cooling rate. When the cooling rate exceeds 50℃/s, the microhardness stabilizes at 288-297HV, which is consistent with the variation law of the simulation results.
Ključne riječi
Q550D steel, JMatPro; cooling rate; CCT; microhardness
Hrčak ID:
347929
URI
Datum izdavanja:
1.10.2026.
Posjeta: 17 *