Control of Carbon Content in Steel by Introducing Proeutectoid Ferrite Transformation into Hot-Rolled Q&P Process

Kinetics of Carbon Partitioning during Non‐Isothermal Treatment and Mechanical Properties of the First Industrial Coils of Hot Rolled Quenched and Partitioned Steel

“…The volume fraction of ferrite was estimated to be ≈23% by several optical micrographs. The transfer of carbon from ferrite was reported to be enriched at ferrite boundaries and the untransformed austenite maintained the parent carbon content of 0.19%. In addition, there was an assumption that all the carbon from ferrite was used to stabilize RA and the maximum amount of RA was ≈4%, if 1.1% carbon content could stabilize RA at room temperature.…”

Bimetal chloride catalyzed hydrogenation of silicon tetrachloride in the presence of silicon

“…1 Nowadays, more than ninety percent of polysilicon is produced by the Siemens method. 2,3 Solar-grade polysilicon is prepared by chemical vapor deposition (CVD) of trichlorosilane (SiHCl 3 , TCS) in the Siemens method. Silicon tetrachloride (SiCl 4 , STC), the main tby-products, is inevitably produced in the CVD process.…”

“…Si + 3HCl -SiHCl 3 + H 2 (3) It is considered that the catalytic hydrogenation of STC to TCS in the presence of silicon includes two steps: (1) STC hydrogenation produces TCS and HCl (eqn (1)), and (2) the resulting HCl reacts with Si to produce more TCS (eqn (3)). [6][7][8] It was also found that the second step (eqn (3)) is a fast reaction, while the first step (eqn (1)) is the rate-determining step which is limited by thermodynamic equilibrium.…”

“…[9][10][11] Various catalysts have been investigated, including transition metals (Cu, Ni, Fe, and Co) and their compounds, and metalcarbon composites and their alloys. 3,[9][10][11][12][13][14] Many research studies are therefore paying more attention to transition metals because of the relatively high catalytic activity. Currently, most commercial factories employ copper as the catalyst owing to its low price, mild operation conditions and high conversion efficiency.…”

“…When using CuCl as a catalyst, copper silicide was generated via the reduction of CuCl by adjacent silicon atoms under the reaction conditions and was considered as the active species. 3,7,11 TCS and HCl were formed via the catalytic hydrogenation of STC over copper silicide. Subsequently, the resulting HCl reacted with Si from copper silicide to produce more TCS.…”