Comparative Assessment on the Hot Deformation Behaviour of 9Cr–1Mo Steel with 1Cr–1Mo Steel

Kumar, Sumit; Karmakar, Anish; Nath, S. K.

doi:10.1007/s12540-020-00826-2

Cited by 5 publications

(3 citation statements)

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“…It may be important whether dynamic and thus metadynamic recrystallization can be induced, or whether static recrystallization will dominate [ 60 , 61 , 62 ]. The critical strain values of e c required to initiate dynamic recrystallization in various alloys is a function of the temperature-compensated strain rate (i.e., the Zener–Hollomon parameter Z (s −1 )) according to the Sellars model [ 63 , 64 , 65 , 66 , 67 , 68 , 69 ]:

where T (K) is temperature, R = 8.314 J·mol −1 ·K −1 is the gas constant, and A and B are the material constants. As the strain rate increases, the critical strain e c will grow, and the probability of at least partial metadynamic recrystallization during cooling will decrease.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

et al. 2020

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The combined effect of deformation temperature and strain value on the continuous cooling transformation (CCT) diagram of low-alloy steel with 0.23% C, 1.17% Mn, 0.79% Ni, 0.44% Cr, and 0.22% Mo was studied. The deformation temperature (identical to the austenitization temperature) was in the range suitable for the wire rolling mill. The applied compressive deformation corresponded to the true strain values in an unusually wide range. Based on the dilatometric tests and metallographic analyses, a total of five different CCT diagrams were constructed. Pre-deformation corresponding to the true strain of 0.35 or even 1.0 had no clear effect on the austenite decomposition kinetics at the austenitization temperature of 880 °C. During the long-lasting cooling, recrystallization and probably coarsening of the new austenitic grains occurred, which almost eliminated the influence of pre-deformation on the temperatures of the diffusion-controlled phase transformations. Decreasing the deformation temperature to 830 °C led to the significant acceleration of the austenite → ferrite and austenite → pearlite transformations due to the applied strain of 1.0 only in the region of the cooling rate between 3 and 35 °C·s−1. The kinetics of the bainitic or martensitic transformation remained practically unaffected by the pre-deformation. The acceleration of the diffusion-controlled phase transformations resulted from the formation of an austenitic microstructure with a mean grain size of about 4 µm. As the analysis of the stress–strain curves showed, the grain refinement was carried out by dynamic and metadynamic recrystallization. At low cooling rates, the effect of plastic deformation on the kinetics of phase transformations was indistinct.

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Section: Resultsmentioning

confidence: 99%

“…The critical strain values of e c required to initiate dynamic recrystallization in various alloys is a function of the temperature-compensated strain rate (i.e., the Zener-Hollomon parameter Z (s −1 )) according to the Sellars model [63][64][65][66][67][68][69]:…”

Section: Comparison Of the Resultsmentioning

confidence: 99%

Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

et al. 2020

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“…Further increases in the yield strength of structural steels can be achieved using a special rolling method, including thermomechanical cold processing (TMCP). This requires systematic control of both temperature and degree of deformation during metal formation [12,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulse Current GMAW on the Yield Stress of the S460M TMCP Steel Welded Joints

et al. 2022

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Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relatively low carbon percentage. These greatly simplify the solution of the problem of improving the quality and reliability of metal structures. At the same time this raises new questions in terms of the technology for welding such steels. In the first instance, it is conditioned by the complex behavior of the TMCP structure under the welding thermal cycle effect. The most important property of the welded joint is yield stress (YS) which characterizes the workability of the whole joint. The estimation of the YS while developing the welding technology is a valuable task for design. This current research has made a complex investigation of the modern welding technique's effect on the behavior of the yield stress formation in TMCP steel welded joints. For progressive technology development, pulse arc welding was used.

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Deformation characteristics and microstructure evolution during hot deformation of 18Cr–12Ni–4Si stainless steel

et al. 2023

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Comparative Assessment on the Hot Deformation Behaviour of 9Cr–1Mo Steel with 1Cr–1Mo Steel

Cited by 5 publications

References 44 publications

Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

Effects of Austenitization Temperature and Pre-Deformation on CCT Diagrams of 23MnNiCrMo5-3 Steel

Effect of Pulse Current GMAW on the Yield Stress of the S460M TMCP Steel Welded Joints

Deformation characteristics and microstructure evolution during hot deformation of 18Cr–12Ni–4Si stainless steel

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