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What is austenite-cementite?
ledeburite
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.
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.
Explain the effect of austenite and ferrite stabilizers?
In steels, alloying elements such as silicon, chromium, molybdenum, aluminum, titanium, niobium, etc., stabilize the (body-centered cubic) ferrite phase. These elements are referred to as ferrite stabilizers. Alloying elements such as carbon, nitrogen, manganese, nickel, copper, etc., stabilize the (face-centered cubic) austenite phase. These elements are referred to as austenite stabilizers.
Which is more soft phase ferrite or austenite in iron carbon diagram?
Pretty sure it is ferrite
Why martensitic transformation never goes to 100 percent completion?
because austenite cannot be fully converted into martensite.
Do you have material which have austenite micro-structure at room temperature?
No, there is not austenite around at room temperature. This gamma phase of iron alloys only appears at elevated temperatures (ball park - a bit over 700 °C). Once the alloy cools below the critical temperature, carbon diffuses and the steel takes on different characteristics -- and is given different names. It is possible to quench steel to get its metallic crystal structure to "set quickly" and bring out certain characteristics (notably hardness), but (again) we give this material a different name. To cite one characteristic of austenite, it is nonmagnetic. It is above its Curie temperature and will not "hold" a magnetic field after the source is removed. A link is provided below. It might be possible to have steel alloys with a micro-structure similarto austenite at room temperature, but the characteristics are different and the alloy is called by a different name. But the mobility of carbon atoms within the structure is a definitive characteristic of austenite. And this only happens at elevated temperatures.
What is austenite and ferrite stabilizer?
ausenit stabilizers are (Ni, Mo, Mn) Ferrite stabilizer are (C, V, Cr and W)
Why is austenite magnetic?
Austenite is not magnetic. It's an allotrope of iron, and has some alloying agents, but it only exists at high temperatures that are well above the Curie point of whatever iron alloy is heated. We know that metals that are magnetic will lose their magnetic properties above a certain temperature (called the Curie point), which varies for different metals and alloys. It is not possible for iron alloys (or any steels) to make the transition to austenite until well past the Curie point of the metal. Any magnetic properties the metal had will have long ago disappeared.
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.
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.
