|About this Abstract
|2023 TMS Annual Meeting & Exhibition
|Phase Transformations and Microstructural Evolution
|H-13: Fracture Analysis for Intermediate Slabs of Wear-resistant Steel Based on Evolution of Surface Decarburization Behavior
|Hao Geng, Yun-he Chang, Zhuang Zhang, Jian-feng Jin, Pu Wang, Jia-quan Zhang
|On-Site Speaker (Planned)
The correlation between surface decarburization behavior of wear-resistant steel and isothermal treatment temperature (650-1200 ℃) was studied, and the formation mechanism of decarburization was discussed to determine the timing of fracture occurrence. Due to the various isothermal treatment processes, the decarburized microstructure can be divided into four types: non-decarburization, complete decarburization, complete and partial decarburization, and partial decarburization. By simulating the hot rolling process, It was found that the decarburized microstructure characteristics of the crack surface was consistent with that of the sample heating from 350 ℃. Both of them were partial decarburization and the depth exceeded 1.8 mm, while the sample cooling from 1000 ℃ was complete decarburization (155 μm). Overall, the fracture occurred during the heating process, and the microstructure at the crack experienced a complex evolution of complete decarburization-austenitization-partial decarburization. The total depth is affected by diffusion coefficient of carbon in the austenite and holding time.
|Solidification, Phase Transformations, Characterization