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You know that austenite to martensite transformation is possible by rapid quenching.Is martensite to austenite conversion possible by heating for all grades of steel where martensite can be formed?
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Is martensite formed when a steel is quenched?
Martensite transformation begins when austenite is cooled below a certain critical temperature, called the matrensite start temperature. As we go below the tmartensite start temperature, more and more martensite forms and complete transformation occurs only at a temperature called martensire finish temp. Formation of martensite require that the austenite phase must be cooled rapidly.
Why martensitic transformation never goes to 100 percent completion?
because austenite cannot be fully converted into martensite.
What is trip steel?
TRIP steel is Transformation Induced Plasticity steel. It is a composite steel that consists of ferrite, bainite, martensite precipitants and restrained austenite. The austenite will transform into martensite when strained, thus increasing the strength of the steel. To stabilize the austenite you need to introduce alloy elements, usually Manganese.
Why ferritic and austenitic stainless steel are not heat treatable?
Ferritic and austenitic stainless steels are not heat treatable since "heat treatable" is taken to mean that martensite may be made to form with relative ease upon quenching austenite from an elevated temperature. For ferritic stainless steels, austenite does not form upon heating, and, therefore, the austenite-to-martensite transformation is not possible. For austenitic stainless steels, the austenite phase field extends to such low temperatures that the martensitic transformation does not occur.
What is austenite?
its a solid solution created when carbon steel is heated to red hot. also know as the alpha iron. during cooling of the steel it can transform into pearlite or ferite.
Why martensite has BCT structure?
when austenite change into martensite, change in the temprature occurs(cooling). Due to this thermal stress devlop between the core and surface . Surface try to expand and core try to compress the size due to this a change in 'c' parameter take place. So a=b but not=c . this is called BCT stracture.
How many kinds of stainless steel are there?
Several. Ferritic, Austenite and Martensitic which can be further broken down into different types. . Austenite has the highest degree of corrosion resistance, ferritic has the best machinability while martensite is the most suitable for objects that need to be hardened. Some examples of martensitic stainless steels are 440c, Ats 34, Cpm s30v.
How are flexon glasses made?
Flexon glasses are a titanium alloy like Nickel-Titanium. These are shape memory alloys that have the ability to transform between martensite and austenite phases when a load or temperature change is applied. they can be forged, extruded, or vacuum melted.
What the definition of critical cooling rate in a context of austenite transformation?
The slowest rate of cooling from the hardening temperature which will produce the fully hardened martensitic condition.
What are the macroscopic and microscopic properties of stainless steel?
Microscopically (what we can see through an electronic microscope), steel is seen in a shape of grains, particules, beans, but the submicroscopic strcture of steel is its crystalline structure: the ferrite is Cubic centred, austenite is cubic faced centred and martensite is like a parallelogram.
What is austenite-cementite?
ledeburite
What is the difference between eutectic and eutectoid?
Eutectic point is where a liquid eutectic composition cools sufficiently to solidify.Eutectoid point is where, within a solid, the material cools enough to undergo a phase transformation. e.g. austenite to cementite a
