Mn based lean 1 GPa duplex stainless TRIP steel with high ductility Experimental procedure Chemical composition mass Alloys Cr Ni Mn N C Cu Si Mo Alloys 20 25 1 5 ID: 557633
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Slide1
Microstructure and deformation mechanisms of a
Mn
‐based lean 1
GPa
duplex stainless TRIP steel with high ductility Slide2
Experimental
procedure
Chemical composition (mass%)
Alloys
CrNiMnNCCuSiMoAlloys20 - 25≤ 1≤ 50.05-0.3≤ 0.13≤ 2≤ 0.5-1.436222.323.651.390.1080.024-0.220.41
AlloyMnNCLow Mn~3.0~ 0.20~ 0.20High C, middle N and Mn~ 5.0~ 0.25~ 0.20Low C, high N, middle Mn~ 5.0~ 0.35~ 0.03Low C and N, high Mn~ 8.0~ 0.10~ 0.10
Hot rolling + Cold rolling + Annealing treatment,
T
Annealing
=
1050°C/5minSlide3
Alloy
g
, %*
M
d(g), °CYS, N/mm²UTS, N/mm²Uniform elongation, %Total elongation, %Low Mn50814457611919High C, middle N and Mn646450310265558Low C, high N, middle Mn6037475
7003153Low C and N, high Mn974732675879731.4362572843269751
55
Result – Mechanical properties
Hot rolling + Cold rolling + Annealing treatment,
T
Annealing
=
1050°C/5min
* Volume
fraction
of
g
before
tensile
testSlide4
Austenite
Results
– Microstructure
Ferrite
Low Mn % gbefore = 50 % gafter = 3.3(Md)g = 81°C0° 2°NDRDSlide5
Results
– Alloy
with high C and mi
ddle N and Mn
Evolution of the microstructure during tensile test e = 0.10 e = 0.15Volume fraction of g before and after tensile test:% gbefore = 64 % gafter = 14(Md)g = 64°C e = 0.20 e = 0.46NDRDSlide6
e
= 0.46
bcc
phasesAustenitee-martensiteResults – Alloy with Middle N and MnSlide7
The high strength level and the excellent forming properties qualify lean duplex stainless TRIP steels for advanced lightweight and high-strength manufacturing applications in the fields of mobility, industrial design, and energy conversion under less corrosive conditions.
ConclusionSlide8
Application
of
lean
duplex
stainless steelsRotating Shelter - Blackpool (England)The Helix Bridge (2010) - SingaporeStonecutters Bridge (2009) - Hong KongAttractive combinations of good mechanical properties and high corrosion resistance Weight reduction Offshore Brazil