Refinement of Coarse-Grained Austenite in a Nb-V-Ti Microalloyed Steel Processed by Medium-Thin Slab Casting and Direct Rolling Route

Sha, Qingyun; Li, Dahang

doi:10.1007/978-3-319-48764-9_343

Cited by 1 publication

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The austenite grain size of the quenched slab served as the initial grain size of reheating. As reported in previous work, 13 the grain size distribution in the reheated condition is different from that in the as cast condition for the steel studied. Grain growth takes place for the smaller grains, while the larger ones remain unchanged.…”

Section: Resultssupporting

confidence: 39%

“…Its chemical composition is Fe-0?04C-0?17Si-1?61Mn-0?014P-0?001S-0?06Nb-0?014Ti-0?030V-0?23Mo (wt-%). The steel has been used in previous studies [12][13][14][15] to determine equations applied in this work.…”

Section: Materials and Experimentalmentioning

confidence: 99%

“…The major equations used in the modelling of the evolution of grain size during roughing rolling have been obtained in previous work. 13–15 These equations, including the equations of peak strain ϵ p and critical strain ϵ c 15 for the initiation of dynamic recrystallisation (DRX), 50% static recrystallisation (SRX) time t 0·5 , 15 SRX grain size D rex 14 and grain growth D 13 from initial grain size D 0 , are given below…”

Section: Materials and Experimentalmentioning

confidence: 99%

“…In ASP, a roughing mill is installed between the reheating furnace and finishing mill. 12 The reheating temperature is about 1150–1200°C, 13 so grain growth of coarse grained austenite may take place and rolling entry temperature is higher than that with TSDR. Meanwhile, an increased slab thickness and separated setting of roughing mill provide larger reduction.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Refinement of coarse grained austenite in Nb–V–Ti microalloyed steel during roughing rolling

Sha

Sun

2014

Ironmaking & Steelmaking

View full text Add to dashboard Cite

The refinement of coarse grained austenite in a Nb-V-Ti microalloyed steel during roughing rolling of a medium thin slab casting and direct rolling process was investigated by considering the austenite grain size distribution. The evolution of grain size distribution was analysed by taking into account dynamic recrystallisation (DRX), static recrystallisation (SRX) and metadynamic recrystallisation (MDRX), strain induced precipitation and retained strain. The results indicated that the initial coarse austenite was significantly refined during roughing rolling. Static recrystallisation is the main post-dynamic softening mechanism during all interpass intervals, but SRXzMDRX may also take place at certain times. The microstructural homogeneity of microalloyed steel produced in this work is better than that in steel produced by thin slab and direct rolling (TSDR) process. This is associated with a higher reheating temperature, a higher entry temperature and a larger reduction due to increased slab thickness in this work compared with the TSDR process.

show abstract

Section: Resultssupporting

confidence: 39%