Influence of Mo on precipitation hardening in hot rolled HSLA steels containing Nb

Lee, W.B; Hong, Seongwon; Park, C.G; Kim, K.H; Park, S.H

doi:10.1016/s1359-6462(00)00411-5

Cited by 135 publications

(60 citation statements)

References 7 publications

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“…It was reported [4] that Mo in small proportion exerted a vigorous effect on hardenability when it was dissolved in austenite. Some work [5] has justified that molybdenum enhanced the effect of precipitation hardening in HSLA steels containing Nb. But the effect of Mo content on microstructure and mechanical properties of high strength pipeline steel has not been well recognized.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel

Kong

Lin²,

Guo³

et al. 2004

Materials & Design

161

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Section: Introductionmentioning

confidence: 99%

Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel

Kong

Lin²,

Guo³

et al. 2004

Materials & Design

161

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“…7 and 8, and the volume fraction of precipitates with diameter £ 20 nm was less in UFC steel than CP steel. It is assumed that precipitates of size less than $20 nm are effective for precipitation hardening ( Ref 29,30). Hence, the effect of precipitation hardening in UFC steel is less in comparison to the CP steel.…”

Section: Effect Of Controlled Cooling Route On Optimization Of Composmentioning

confidence: 99%

Microstructure and Mechanism of Strengthening of Microalloyed Pipeline Steel: Ultra-Fast Cooling (UFC) Versus Laminar Cooling (LC)

Zhao

Wang

et al. 2016

J. of Materi Eng and Perform

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A novel thermo-mechanical controlled processing (TMCP) schedule involving ultra-fast cooling (UFC) technique was used to process X70 (420 MPa) microalloyed pipeline steel with high strength-high toughness combination. A relative comparison is made between microstructure and mechanical properties between conventionally processed (CP) and ultra-fast cooled (UFC) pipeline steels, together with differences in strengthening mechanisms with respect to both types of processes. UFC-processed steel exhibited best combination of strength and good toughness compared to the CP process. The microstructure of CP pipeline steel mainly consisted of acicular ferrite (AF), bainitic ferrite (BF), and dispersed secondary martensite/austenite (M/A) constituent and a small fraction of fine quasi-polygonal ferrite. In contrast, the microstructure of UFC-processed pipeline steel was predominantly composed of finer AF, BF, and dispersed M/A constituent. The primary strengthening mechanisms in UFC pipeline steel were grain size strengthening and dislocation strengthening with strength increment of $277 and $151 MPa, respectively. However, the strengthening contribution in CP steel was related to grain size strengthening, dislocation strengthening, and precipitation strengthening, and the corresponding strength increments were $212, $149 and $86 MPa, respectively. The decrease in strength induced by reducing Nb and Cr in UFC pipeline steel was compensated by enhancing the contribution of grain size strengthening in the UFC process. In conclusion, cooling schedule of UFC combined with LC is a promising method for processing low-cost pipeline steels.

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“…Comparing AISI 4120 with AISI 5120, the former showed a little high strength than the latter. It may be based on improvement of strength by the effect of precipitation hardening of Mo [10,11]. Mo carbides are precipitated at grain boundary and disturb dislocation Fig.…”

Section: Tensile Test At Room Temperature and High Temperaturesmentioning

confidence: 99%

A study on the mechanical properties for developing a computer simulation model for heat treatment process

Lee

Kim

Chin

et al. 2007

Journal of Materials Processing Technology

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Influence of Mo on precipitation hardening in hot rolled HSLA steels containing Nb

Cited by 135 publications

References 7 publications

Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel

Influence of Mo content on microstructure and mechanical properties of high strength pipeline steel

Microstructure and Mechanism of Strengthening of Microalloyed Pipeline Steel: Ultra-Fast Cooling (UFC) Versus Laminar Cooling (LC)

A study on the mechanical properties for developing a computer simulation model for heat treatment process

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