Nano-grain evolution in austenitic stainless steel during multi-directional forging

Nakao, Y.; Miura, Hiromi

doi:10.1016/j.msea.2010.10.018

Cited by 103 publications

(46 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results have been reported for a Cu-30%Zn alloy and a 316L austenitic stainless steel subjected to multidirectional forging [13,14]. Therefore, it was concluded that a decrease in the SFE owing to the use of a low processing temperature and a high strain-rate deformation facilitate mechanical twinning, resulting in the refinement of grains, which is further enhanced by the intersecting of the different variants [13,14]. In contrast, at room temperature, the 304 steel exhibits a low SFE and low austenite stability when compared to the 316L steel.…”

supporting

confidence: 85%

High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

Mine

Haraguchi

Horita

et al. 2015

Philosophical Magazine Letters

View full text Add to dashboard Cite

We subjected samples of a 304 metastable austenitic stainless steel to high-pressure torsion (HPT) in the temperature range of 303-573 K, (i.e. at different austenite stabilities), to examine their microstructures and mechanical properties. HPT processing at room temperature led to the formation of a lamellar microstructure with austenitic and martensitic phases, of which sizes were characterised by prior austenite grains, whereas HPT processing at moderate temperatures produced nanostructured austenite grains through mechanical twinning. The nanostructured 304 steel with an average grain size of~70 nm exhibited a fine balance between tensile strength (~1.7 GPa) and reduction of area (~55%).

show abstract

supporting

confidence: 85%

High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

Mine

Haraguchi

Horita

et al. 2015

Philosophical Magazine Letters

View full text Add to dashboard Cite

show abstract

“…Stainless steels with grain/subgrain sizes of tens to hundreds nanometers have been obtained by using large strain cold deformations. 4,17,18) In previous studies, the strengthening of austenitic stainless steels processed by severe plastic deformations was commonly attributed to the developed nanocrystalline structures. [4][5][6][7][8][9][18][19][20] It should be noted, that the ultrafine grained microstructures that developed in stainless steels during cold deformation were characterized by high dislocation densities.…”

Section: On Strengthening Of Austenitic Stainless Steel By Large Stramentioning

confidence: 99%

“…The yield strength of austenitic stainless steels can be significantly increased by cold working, i.e., plastic deformation at ambient temperature. [3][4][5][6] Among various techniques of cold deformation, cold rolling is the most efficient method for production of the sizable semi-products of stainless steels. The cold rolling techniques have been successfully utilized for development of stainless steels with high yield strength above 1 500 MPa.…”

Section: Introductionmentioning

confidence: 99%

On Strengthening of Austenitic Stainless Steel by Large Strain Cold Working

et al. 2016

View full text Add to dashboard Cite

“…3 The process is capable of generating large plastic strains that significantly refines the microstructure without altering the external dimensions of the specimens. Many different SPD processing techniques have been developed, including equal channel angular pressing (ECAP), 4 high pressure torsion (HPT), 5 multi-directional forging, 6 accumulative roll bonding (ARB), 7 and many others. All of these procedures are capable of introducing large plastic strains and obtaining significant microstructural refinement in bulk crystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Vacancy-Type Defects Study on Ultra-Fine Grained Aluminium Processed by Severe Plastic Deformation

Su¹,

Lü²,

Deng³

et al. 2014

sci adv mater

View full text Add to dashboard Cite

Vacancy-type defects play an important role in the metal materials deformed by severe plastic deformation (SPD). The present work use positron annihilation lifetime spectroscopy (PALS) to test the vacancy-type defects in aluminium alloys processed by equal channel angular pressing (ECAP) and accumulative roll bonding (ARB). ECAP at room temperature and cryogenic temperature was conducted to AA1050 and ARB with 200 C preheating was conducted to AA1050 and AA6061 to produce laminated AA1050 sheets, AA6061 sheets and AA1050/AA6061 composites. High fraction of vacancy-type defects were detected in all the deformed samples. Vacancies associated with dislocations and bulk mono-vacancies have been identified in RT-ECAP deformed samples. Three types of vacancy-type defects, vacancies associated with dislocations, bulk mono-vacancies and bulk di-vacancies, have been identified in the CT-ECAP processed samples. The ARB process is more efficient in grain refinement and strengthening. However, the accumulation of vacancytype defects in ARB deformation seems less efficient. Vacancies associated with dislocations are the major vacancy-type defects for ARB processed AA1050 sheets but there exist some bulk mono-vacancies. However, most of the vacancy-type defects in the ARB processed AA6061 are vacancies associated with dislocations. A very small fraction of bulk mono-vacancies can be extracted but it is so small that it can be neglected. The lifetimes of ARB processed AA1050/AA6061 composites are generally in between the values of AA1050 sheets and AA6061 sheets. Voids were not detected in neither of the samples. ABSTRACTVacancy-type defects play an important role in the metal materials deformed by severe plastic deformation (SPD). The present work use positron annihilation lifetime spectroscopy (PALS) to test the vacancy-type defects in aluminium alloys processed by equal channel angular pressing (ECAP) and accumulative roll bonding (ARB). ECAP at room temperature and cryogenic temperature was conducted to AA1050 and ARB with 200 C preheating was conducted to AA1050 and AA6061 to produce laminated AA1050 sheets, AA6061 sheets and AA1050/AA6061 composites. High fraction of vacancy-type defects were detected in all the deformed samples.Vacancies associated with dislocations and bulk mono-vacancies have been identified in RT-ECAP deformed samples. Three types of vacancy-type defects, vacancies associated with dislocations, bulk mono-vacancies and bulk di-vacancies, have been identified in the CT-ECAP processed samples. The ARB process is more efficient in grain refinement and strengthening. However, the accumulation of vacancy-type defects in ARB deformation seems less efficient. Vacancies associated with dislocations are the major vacancy-type defects for ARB processed AA1050 sheets but there exist some bulk mono-vacancies. However, most of the vacancy-type defects in the ARB processed AA6061 are vacancies associated with dislocations. A very small fraction of bulk mono-vacancies can be extracted but it is so small t...

show abstract

Nano-grain evolution in austenitic stainless steel during multi-directional forging

Cited by 103 publications

References 31 publications

High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

On Strengthening of Austenitic Stainless Steel by Large Strain Cold Working

Vacancy-Type Defects Study on Ultra-Fine Grained Aluminium Processed by Severe Plastic Deformation

Contact Info

Product

Resources

About