《轮工工程基础》材料料题,三管轮(The basic material of the wheel work engineering, three pipe wheels).docVIP
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《轮工工程基础》材料料题,三管轮(The basic material of the wheel work engineering, three pipe wheels)
《轮工工程基础》材料料题,三管轮(The basic material of the wheel work engineering, three pipe wheels) 13. The following metallic materials are made of brittle materials and are __B____. A. low carbon steel b. cast iron c. manganese steel d. copper 14. In the following metal materials, the worst welding is ___D___. A. Low carbon steel b. medium carbon steel c. high carbon steel d. cast iron In the case of an alloy, the following error is ___A___. A. Solubility of solute in solid solution is limited The phase structure of the alloy cannot determine the properties of the alloy The solid solution is one of the basic phases of the alloy D. Alloy group elements are usually elements 16. The transformation of lattice type does not occur in ___A___ transformation. A. recrystallization b. eutectoid c. crystallization d. austenite toward martensite 17. The transformation from A (austenite) to P (pearlite) belongs to _B_____. A. the transformation of C. Eutectic transformation 18. The heat treatment of steel is the process of changing the performance through heating, heat preservation and cooling. The steel is in _B_____. A. liquid b. solid c. overcooled d. saturation state 19. Recrystallization annealing is an operation that takes the parts of ___C___ and heats them to a recrystallization temperature. A. heat treatment b. heat processing c. cold processing d. welding 20. On the surface quenching of parts, the following statement is correct to have __D____. Ⅰ, surface quenching Ⅱ enhances surface, surface quenching do not change the core organizations Ⅲ, parts surface layer of tempered martensite A. Ⅰ + Ⅱ b. Ⅱ + Ⅲ c. Ⅰ + Ⅲ d. Ⅰ + Ⅱ + Ⅲ 21. The tempered steel requires that the carbon content be in a certain range, such as low carbon content, and __D____; The carbon content is too high. A. low/stiffness/low stiffness/low strength C. Low toughness/fatigue performance. Low hardness/low toughness 22. The total alloy element of high alloy steel is __D____. A. Greater than 15% b. 8% c. 12% d. 10%
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