15春西交《工程材料基础》在线作业 满分答案（15, spring West to engineering materials foundation online homework, out of the answer）.docVIP

15春西交《工程材料基础》在线作业 满分答案（15, spring West to engineering materials foundation online homework, out of the answer） Austrian Peng 15 spring West to submit engineering materials foundation online homework Total score: 100 test time: - Radio examination Judgment question Radio examination questions (25 questions, 50 points) 1., the purpose of grading quenching of workpieces is () A. obtained lower bainite B. reduces the residual austenite volume C. reduces workpiece deformation D. shorten production cycle Full marks: 2 2. what is the plastic deformation of metals mainly through the following way? Relative sliding of A. grains Kink of B. lattice The slip of C. dislocation Change of D. dislocation type Full marks: 2 3., a workpiece is made of single phase brass, and its strengthening process should be () A. aging strengthening B. solid solution strengthening C. deformation strengthening D. heat treatment strengthening Full marks: 2 4. in Fe-Fe3C alloy, the carbon content of the alloy containing two carburizing in the equilibrium structure is the highest A. 0.0008% B. 0.021% C. 0.77% D. 2.11% Full marks: 2 5. the final heat treatment of the rolling bearing steel GCr15 should be () A. quenching + low temperature tempering B. carburizing + quenching + low temperature tempering C. quenching + medium temperature tempering D. nitriding + quenching + low temperature tempering Full marks: 2 6. which steel may precipitate a network cementite after a complete annealing of the following steels? A. Q235 B. 45 C. 60Si2Mn D. T12 Full marks: 2 7. common quenched and tempered steels are mostly () A. low carbon low alloy steel B. medium low carbon alloy steel C. high carbon low alloy steel D. low carbon medium alloy steel Full marks: 2 8., the purpose of normalizing high temperature cast iron is to obtain which of the following organizations? A. F+G B. F+P+G C. P+G D. Ld+G Full marks: 2 9. among the following alloy steels, the best corrosion resistance is () A. 20CrMnTi B. 40Cr C. W18Cr4V D.