TAILIEUCHUNG - Machinery's Handbook 2th Episode 4 Part 9

Tham khảo tài liệu 'machinery's handbook 2th episode 4 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Machinery s Handbook 27th Edition MATERIALS 3035 They are then rinsed with water and dried with alcohol. Very thin layers of iron sulphide are deposited on the different constituents in different thicknesses and this gives them different colors. Austenite remains a pale brown martensite is given a pale blue and deep blue and brown color troostite is made very dark sorbite is uncolored cementite exhibits a brilliant white and ferrite is made dark brown. When the etching has proceeded to the desired extent the specimen is at once washed thoroughly in order to remove all trace of the etching reagent. Usually it is simply rinsed with water but frequently the washing is done with absolute alcohol while ether and chloroform are also sometimes used. The apparatus used for examining the etched surfaces of metals is composed of a microscope and camera combined with an arc lamp or other means of illumination. Microscopic Study of Steel Steel in particular shows many changes of structure due to the mechanical and thermal treatment so that the microscope has become a very valuable instrument with which to inspect steel. To one who understands what the different formations of crystalline structure denote the magnified surface reveals the temperature at which the steel was hardened or at which it was drawn and the depth to which the hardness penetrated. It also shows whether the steel was annealed or casehardened as well as the depth to which the carbon penetrated. The carbon content can be closely judged when the steel is annealed and also how much of it is in the graphitic state in the high carbon steels. The quantity of special elements that is added to steel such as nickel chromium tungsten etc. can also be estimated when the alloy to be examined has been put through its prescribed heat-treatment. Likewise the impurities that may be present are clearly seen regardless of whether they are of solid or gaseous origin. Micarta. Micarta is a non-metallic laminated product of .

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