Correlation between Zener–Hollomon parameter and necklace DRX during hot deformation of 316 stainless steel

Jafari, Meysam; Najafizadeh, A.

doi:10.1016/j.msea.2008.09.073

Cited by 106 publications

(38 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Z value calculation was based on activation energy (Q def ) of 400 kJ/mol. This value was not estimated in this investigation but taken from the literature [22,[27][28][29]. Not all Z values have been included on the plot to stop it becoming too cluttered.…”

Section: Flow Curves Analysismentioning

confidence: 99%

Effect of hot working on dynamic recrystallisation study of as-cast austenitic stainless steel

Mandal

Stanford

Hodgson

et al. 2012

Materials Science and Engineering: A

View full text Add to dashboard Cite

Section: Flow Curves Analysismentioning

confidence: 99%

Effect of hot working on dynamic recrystallisation study of as-cast austenitic stainless steel

Mandal

Stanford

Hodgson

et al. 2012

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…Although most of the studies on DRX reported in the literature are based on uniaxial hotcompression tests, [1,[3][4][5][6][7] a few studies are also based on plane-strain hot compression. [8,9] However, to the best of our knowledge, the influence of the state of stress (i.e., uniaxial vs plain-strain compression) on DRX kinetics and mechanisms has not been reported in the open literature.…”

mentioning

confidence: 99%

Influence of State of Stress on Dynamic Recrystallization in a Titanium-Modified Austenitic Stainless Steel

Mandal

Bhaduri

Sarma

2011

Metall Mater Trans A

View full text Add to dashboard Cite

The influence of the state of stress on the microstructure and dynamic recrystallization (DRX) in a titaniummodified austenitic stainless steel is assessed by performing plane-strain and uniaxial hot compression studies. Although the state of stress does not alter the mechanisms of DRX nucleation, the kinetics of DRX is hindered during plane-strain deformation vis-a`-vis uniaxial deformation.Dynamic recrystallization (DRX) is the most important restoration mechanism during the hot deformation of low-stacking fault energy, face-centered cubic alloys. The DRX process influences mainly the final microstructure and mechanical properties of the deformed material and, thus, the formability of materials. [1] Microstructure control through DRX requires a detailed knowledge of microstructural evolution as a function of processing parameters (i.e., strain, strain rate, and temperature). A special emphasis needs to be given in understanding the nucleation mechanisms during DRX. In our recent study, microstructural evolution and DRX behavior in a Ti-modified austenitic stainless steel (referred to as alloy D9) during hot working was investigated over a range of temperature (1173 K to 1373 K [900°C to 1100°C]) and strain (0.2 to 0.8) at a strain rate 10 seconds À1 . [2] The nucleation of new DRX grains has been found to occur by bulging of the parent grain boundary. The processing parameters have been found to influence strongly the grain boundary character distribution and DRX in alloy D9.In addition to the processing parameters, the mode of deformation (i.e., state of stress) is expected also to influence the microstructure evolution and DRX behavior of materials. Although most of the studies on DRX reported in the literature are based on uniaxial hotcompression tests, [1,[3][4][5][6][7] a few studies are also based on plane-strain hot compression. [8,9] However, to the best of our knowledge, the influence of the state of stress (i.e., uniaxial vs plain-strain compression) on DRX kinetics and mechanisms has not been reported in the open literature. The objective of the current study is to investigate the role of state of stress on microstructural evolution and DRX behavior of alloy D9.The alloy D9 (in solution-annealed condition) used in this study is an austenitic stainless steel containing Fe-0.05C-1.51Mn-0.51Si-0.002S-0.01P-15.05Cr-15.07Ni-2.25Mo-0.21Ti-0.01Co-0.006N (in wt pct). Uniaxial hot-compression tests were conducted on cylindrical specimen of 10 mm diameter and 15 mm height, whereas the plane-strain hot compression tests were conducted on a 20 9 15 9 10 mm 3 solid bar using a specially designed anvil in a Gleeble thermomechanical simulator. The compression tests were performed in the temperature range of 1173 K to 1373 K [900°C to 1100°C] (in steps of 100 K) at a strain rate of 10 seconds À1 . Various degrees of deformation (to true strains of 0.2, 0.4, 0.6, and 0.8) were imparted at each temperature to study the influence of strain on microstructural evolution. The hot-deformed specimens were water quenched wit...

show abstract

“…In metal deformation, a lower strain rate causes a higher strain gradient from HAGBs to the inside of grains [14]. is means that the deformation is located in a very narrow region near the HAGBs, which is termed "GB sliding" [18,19]. Owing to the high temperature and low strain rate, dislocations have sufficient time to form dislocation walls and LAGBs [12,14].…”

Section: Drx Mechanism Under Very Low Strain-ratementioning

confidence: 99%

Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Wang

Xue

Zhao

2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In recent years, superheavy forgings that are manufactured from 600 t grade ingots have been applied in the latest generation of nuclear power plants to provide good safety. However, component production is pushing the limits of the current free-forging industry. Large initial grain sizes and a low strain rate are the main factors that contribute to the deformation of superheavy forgings during forging. In this study, 18Mn18Cr0.6N steel with a coarse grain structure was selected as a model material. Hot compression and hot tension tests were conducted at a strain rate of 10 −4 ·s −1. e essential nucleation mechanism of the dynamic recrystallization involved low-angle grain boundary formation and subgrain rotation, which was independent of the original highangle grain boundary bulging and the presence of twins. Twins were formed during the growth of dynamic recrystallization grains. e grain refinement was not obvious at 1150°C. A lowering of the deformation temperature to 1050°C resulted in a fine grain structure; however, the stress increased significantly. Crack-propagation paths included high-angle grain boundaries, twin boundaries, and the insides of grains, in that order. For superheavy forging, the ingot should have a larger height and a smaller diameter.

show abstract

Correlation between Zener–Hollomon parameter and necklace DRX during hot deformation of 316 stainless steel

Cited by 106 publications

References 17 publications

Effect of hot working on dynamic recrystallisation study of as-cast austenitic stainless steel

Effect of hot working on dynamic recrystallisation study of as-cast austenitic stainless steel

Influence of State of Stress on Dynamic Recrystallization in a Titanium-Modified Austenitic Stainless Steel

Microstructure Evolution and Surface Cracking Behavior of Superheavy Forgings during Hot Forging

Contact Info

Product

Resources

About