Juho Talonen
Outokumpu
Ultimate tensile strengthDynamic strain agingFerrite (iron)Deformation (engineering)Gibbs free energyStrain rateRecrystallization (metallurgy)Composite materialFlow stressIndentation hardnessTensile testingIntergranular corrosionMartensiteMetallurgyGrain sizeMaterials scienceDeformation mechanismDiffractionStacking-fault energyScanning electron microscopeWork hardeningStacking faultShear bandAustenitic stainless steelTwipElectron backscatter diffractionDeep drawingStrain induced martensiteResidual stressAtmospheric temperature rangeBainiteGrain boundaryHydrogenManganeseCrackingStrain (chemistry)Diffusionless transformationAnnealing (metallurgy)MicrostructureMetastabilityHydrogen embrittlementAustenite
32Publications
12H-index
1,563Citations
Publications 32
Newest
#1Suvi PapulaH-Index: 6
#2Teemu SarikkaH-Index: 9
Last. Hannu Hänninen (Aalto University)H-Index: 19
view all 6 authors...
Susceptibility of three lean-alloyed ferritic-austenitic stainless steels to hydrogen-induced delayed cracking was examined, concentrating on internal hydrogen contained in the materials after production operations. The aim was to study the role of strain-induced austenite to martensite transformation in the delayed cracking susceptibility. According to the conducted deep drawing tests and constant load tensile testing, the studied materials seem not to be particularly susceptible to delayed cra...
3 CitationsSource
#1Suvi Papula (Aalto University)H-Index: 6
#2Severi Anttila (University of Oulu)H-Index: 3
Last. Hannu Hänninen (Aalto University)H-Index: 19
view all 6 authors...
Abstract Mechanical properties and strain hardening of two pilot-scale lean-alloyed ferritic-austenitic stainless steels having metastable austenite phase, present at 0.50 and 0.30 volume fractions, have been studied by means of tensile testing and nanoindentation. These ferritic-austenitic stainless steels have high strain-hardening capacity, due to the metastable austenite phase, which leads to an improved uniform elongation and higher tensile strength in comparison with most commercial lean d...
14 CitationsSource
#1A. Kisko (University of Oulu)H-Index: 11
#2Atef Hamada (University of Oulu)H-Index: 19
Last. Leo Pentti Karjalainen (University of Oulu)H-Index: 35
view all 5 authors...
Abstract The influence of reversion annealing on the microstructure and mechanical properties of an austenitic high-Mn low-Ni 15Cr–9Mn–1.1Ni–1.7Cu stainless steel with and without Nb alloying was investigated. The steel sheets were cold rolled to a 60% thickness reduction to obtain about 60% of strain-induced α'-martensite and subsequently annealed at temperatures between 700 and 1100 °C for 0.1–1000 s in order to revert the α'-martensite back to austenite and recrystallize the retained austenit...
48 CitationsSource
#1Suvi Papula (Aalto University)H-Index: 6
#2Tapio Saukkonen (Aalto University)H-Index: 14
Last. Hannu Hänninen (Aalto University)H-Index: 26
view all 4 authors...
5 CitationsSource
#1A. Kisko (University of Oulu)H-Index: 11
#2Juho Talonen (Outokumpu)H-Index: 12
Last. Leo Pentti Karjalainen (University of Oulu)H-Index: 35
view all 4 authors...
14 CitationsSource
#1Suvi Papula (Aalto University)H-Index: 6
#2Juho Talonen (Outokumpu)H-Index: 12
Last. Hannu Hänninen (Aalto University)H-Index: 26
view all 3 authors...
Delayed cracking in unstable low-Ni austenitic stainless steel 204Cu was studied by constant load tensile testing. The developed testing arrangement enabled a systematical examination on the effect of applied stress, strain-induced α′-martensite and internal hydrogen content on time to fracture. Volume fraction of strain-induced α′-martensite was shown to affect cracking kinetics, except at a very high stress level. Hydrogen content had a marked effect on time to fracture, also at the highest ap...
2 CitationsSource
#1Kim-Niklas AntinH-Index: 7
#2Juho TalonenH-Index: 12
Last. Hannu HänninenH-Index: 26
view all 4 authors...
#1Kim-Niklas AntinH-Index: 7
#2Juho Talonen (Outokumpu)H-Index: 12
Last. Hannu HänninenH-Index: 26
view all 4 authors...
#1Antti Forsström (Aalto University)H-Index: 3
#2Juho TalonenH-Index: 12
Last. Hannu Hänninen (Aalto University)H-Index: 19
view all 4 authors...
Grain boundary engineering (GBE) of 304 and 316 austenitic stainless steels has been widely researched but studies on other grades of austenitic stainless steels are less common. In this study, application of GBE on metastable austenitic stainless steels 204Cu, 301, and 301LN was assessed. Thermomechanical processing parameters were obtained for each of the tested steel grades by varying cold rolling reduction and annealing temperature, and analyzing the acquired grain boundary character distrib...
1 CitationsSource
#1S. Ortega (Aalto University)H-Index: 1
#2Suvi Papula (Aalto University)H-Index: 6
Last. Hannu Hänninen (Aalto University)H-Index: 26
view all 5 authors...
Fracture behaviour of metastable austenitic stainless steels (Cr-Ni grade 301 and low-Ni high-Mn grades 201 and 204Cu) that suffer of delayed cracking after deep drawing was examined. The phenomenon of delayed cracking is known to be related to the coexistence of internal hydrogen, strain-induced α′-martensite and tensile residual stresses. The objective of this study was to maximize the information attainable from the common Swift cup test, which is used to evaluate the formability and delayed ...
3 CitationsSource