Trip steel

TRIP Steel

TRansformation Induced Plasticity - Steel

Mohammed Ajmal Sheriff.Fm.Tech-manufacturing engineering.b.s.abdur rahman university.

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TRIP Steel

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INTRODUCTION

•TRIP-aided steels are new generation of low-alloy steel•Enhanced combination of strength and ductility.•Triple phase micro structure – Ferrite, bainite and retained austenite.•Greater elongation.•High strain hardening capacity.•Good formability and drawability.


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COMPOSITION OF TRIP STEEL

•Hypoeutectoid iron carbon alloys.•0.1 – 0.4 % carbon by weight.•Alloying elements to prevent high carbon cementite phase, which raises the carbon concentration of the austenite phase.•Silicon and Aluminium are two common alloying elements.•Titanium, Niobium, Vanadium, etc., are other alloying elements can be added to improve the strength of the alloy.•Good formability and drawability.


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“TRIP” EFFECT


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PROCESSING METHOD

•Intercritical annealing is used to obtain the correct phase distribution.•Temperature above Eutectoid – material is composed of a solid austenite phase and solid ferrite phase.•The material is then isothermally cooled at a temperature of approximately 400 degrees Celsius, in order to allow the austenite to form a banitic ferrite phase.•In a typical steel alloy, the excess carbon would form a high carbon cementite phase. However, the silicon and aluminium prevent the formation of cementite. •The result of the intercritical annealing process is a material composed primarily of ferrite, and bainite. formed from the austenite phase during intercritical annealing, as well as dispersed retained austenite, and martensite phases.


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PROCESSING METHOD

Micrograph from SEM Intercritical annealing processOn the iron phase diagram


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CHARACTERISTICS OF TRIP STEELS

CHEMICAL COMPOSITION


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MECHANICAL PROPERTIES


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MECHANICAL PROPERTIES


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FATIGUE STRENGTH


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IMPACT STRENGTH


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ELONGATION Vs UTS


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FORMABILITY


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RESISTANCE SPOT WELDING


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ECONOMICS OF TRIP STEELS

•Usually, steel is used for its strength, formability and low cost relative to other metals. •Titanium, magnesium and aluminum offers significant weight savings in automobile components.•Lower abudance, high production cost and high machining cost.•TRIP steels don not face any of these difficulties, because they are low alloy steel.•TRIP steels can be produced for the same price as other high strength steel.


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APPLICATION

•As a result of their high energy absorption capacity and fatigue strength, TRIP steels are particularly well suited for automotive structural and safety parts such as

Cross members, Longitudinal beams, B- pillar reinforcements, Sills and bumper

reinforcements.


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REFERENCES


1. http://en.wikipedia.org/wiki/TRIP_steel 2. http://www.arcelormittal

.com/automotive/saturnus/sheets/B_EN.pdf 3. http://www.keytometals.com/page.aspx?ID=CheckA

rticle&site=kts&LN=EN&NM=194

4. http://www.appropedia.org/Transformation_Induced_Plasticity_%22TRIP%22_Steel

5. http://coursenotes.mcmaster.ca/701.../701_Yankui_Bian_Jan_16_08.pdf

TRIP Steel

http://en.wikipedia.org/wiki/TRIP_steel








http://www.arcelormittal.com/automotive/saturnus/sheets/B_EN.pdf



http://www.keytometals.com/page.aspx?ID=CheckArticle&site=kts&LN=EN&NM=194

http://www.keytometals.com/page.aspx?ID=CheckArticle&site=kts&LN=EN&NM=194

http://www.appropedia.org/Transformation_Induced_Plasticity_%22TRIP%22_Steel

http://www.appropedia.org/Transformation_Induced_Plasticity_%22TRIP%22_Steel

http://coursenotes.mcmaster.ca/701.../701_Yankui_Bian_Jan_16_08.pdf




Thank You


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TRIP Steel

Trip steel

Education

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