Investigation of the α–γ phase transformation by annealing of a cold-worked Fe-Mn base alloy

1978 ◽  
Vol 48 (1) ◽  
pp. K51-K53 ◽  
Author(s):  
J. Barton ◽  
E. Wieser ◽  
M. Müller
Keyword(s):  
Phase Transformation ◽  
Base Alloy ◽  
Cold Worked

TECH-TRONIC 32

Alloy Digest ◽  
1978 ◽  
Vol 27 (3) ◽  
Keyword(s):  
Stainless Steel ◽  
Base Alloy ◽  
High Strength ◽  
Heat Treating ◽  
304 Stainless Steel ◽  
Iron Base Alloy ◽  
Nickel Chromium ◽  
Aisi Type ◽  
Cold Worked ◽  
Type 304

Abstract TECH-TRONIC 32 stainless steel is essentially a low-nickel chromium-manganese austenitic iron-base alloy. In the annealed condition it provides about twice the yield strength of AISI Type 304 stainless steel and almost the same resistance to corrosion. It also offers improved wear and galling resistance over standard stainless steels. TECH-TRONIC 32 can be cold worked to high strength levels with retention of good ductility. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-348. Producer or source: Techalloy Company Inc..

Submicrocrystalline Structures and Tensile Behaviour of Stainless Steels Subjected to Large Strain Deformation and Subsequent Annealing

2011 ◽  
Vol 409 ◽  
pp. 607-612 ◽  
Author(s):  
Iaroslava Shakhova ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev ◽  
Yuuji Kimura ◽  
Kaneaki Tsuzaki
Keyword(s):  
Plastic Deformation ◽  
Tensile Strength ◽  
Phase Transformation ◽  
Stainless Steels ◽  
Ferritic Steel ◽  
Subgrain Size ◽  
Large Strain ◽  
Tensile Behaviour ◽  
Type Steel ◽  
Cold Worked

Tensile behaviour of two steels with submicrocrystalline structures, i.e. a 304-type austenitic steel and an Fe-27%Cr-9%Ni austenitic-ferritic steel, was studied. The starting materials were subjected to large strain rolling and swaging to a total strain of ∼4 at ambient temperature. The severe deformation resulted in a partial martensitic transformation and the development of highly elongated austenite/ferrite (sub) grains aligned along the deformation axis. In the cold worked state, the transverse grain/subgrain size was about 100 nm in the 304-type steel and about 150 nm in the Fe-27%Cr-9%Ni steel. The grain refinement by severe plastic deformation resulted in increase of ultimate tensile strength to 2000 MPa and 1800 MPa in 304-type and Fe-27%Cr-9%Ni steels, respectively. The phase transformation and recrystallization took place concurrently upon annealing, leading to the development of submicrocrystalline structure consisting of austenite and ferrite grains. No significant softening took place under annealing at temperatures below 600°C. The tensile strength was 1920 MPa in 304-type steel and 1710 MPa in Fe-27%Cr-9%Ni steel after annealing at 500°C for 2 hours.

High-Temperature Phase Transformation in Cr Added TiAl Base Alloy

1998 ◽  
Vol 552 ◽  
Author(s):  
E. Abe ◽  
K. Niinobe ◽  
M. Nobuki ◽  
M. Nakamura ◽  
T. Tsujimoto
Keyword(s):  
Phase Transformation ◽  
High Temperatures ◽  
Base Alloy ◽  
Small Degree ◽  
Phase Region ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Air Cooling ◽  
Two Phase ◽  
Transmission Electron

ABSTRACTWe have investigated a microstructure evolution of a Ti-48Al-3.5Cr (in at.%) alloy at high-temperatures (>1473K). In the alloy annealed at 1673K for 1.8ks, followed by air-cooling, a characteristic microstructure with a feathery fashion was uniformly formed. From a cooling-rate-controlling study, it was found that formation of the feathery structure is accomplished during continuous cooling from 1673K to 1573K, within the α+γ two-phase region. Transmission electron microscopy revealed that the feathery structure is composed of lamellar colonies (5–10µm) which are crystallographicaly tilted slightly (a few degree) with their neighbors. A surprising fact is that lamellae in each colony are mostly the γphase with few α2 phase less than 5% in volume. This suggests that the feathery structure is a metastable product and has not resulted from the α → α+γ transformation above 1573K. Instead, the feathery structure formation should be attributed to the non-equilibrium α → γtransformation which occurs at high-temperatures with a small degree of supercooling. We discuss this interesting phase transformation in terms of the α→γ massive transformation, based on the continuous-coolingtransformation (CCT) diagram constructed for the present alloy.

scholarly journals Analysis of Phase Transformation in Nickel-Base Alloy after Ageing

2019 ◽  
Vol 135 (2) ◽  
pp. 98-102 ◽  
Author(s):  
A. Merda ◽  
A. Zieliński ◽  
G. Golański
Keyword(s):  
Phase Transformation ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Nickel Base

scholarly journals Microstructure and Texture Evolution During the Annealing of Cold-worked Zr-1 wt%Nb

1991 ◽  
Vol 13 (2-3) ◽  
pp. 133-154 ◽  
Author(s):  
Derek O. Northwood ◽  
John W. Robinson ◽  
Zheng Jie
Keyword(s):  
Phase Transformation ◽  
Texture Evolution ◽  
Inverse Pole Figure ◽  
Optical Metallography ◽  
Phase Changes ◽  
Mechanical Anisotropy ◽  
X Ray ◽  
Knoop Microhardness ◽  
Cold Worked ◽  
Figure Technique

The texture changes in tube reduced (60%) and stress relieved Zr-1 wt%Nb nuclear fuel sheathing on annealing at temperatures from 300–1100℃ for 104 seconds have been measured using an X-ray inverse pole figure technique. These changes in texture are then related to changes in both mechanical anisotropy as determined using Knoop microhardness measurements and microstructure as seen using optical metallography. Changes in texture and anisotropy arise both from recrystallization and phase changes, with major texture changes only occurring at temperatures where there is a phase transformation to βZr.

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