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一 选择题 1 由构成合金的各组元的原子溶合而形成的单一均匀的金属晶体为( )。 A.固溶体 E.金属化合物 C.机械混合物 2 所有亚共析钢的室温平衡组织都由( )组成。 A.珠光体 B.铁索体和珠光体 C.渗碳体和珠光体 3 在930℃±10℃,保温3～8h下测出的奥氏体晶粒度的大小称为( )。 A.起始晶粒度 D.本质晶粒度 C.实际晶粒度 4 共析钢的含碳量是( )。 A.0.8％ B.4.3％ C.0.8～2.06％ 5 将钢加热到临界点以上,保温一定时间后使其缓慢冷却以获得接近平衡状态的组织,这种工艺称为( )。 A.正火 B.回火 C.退火 6 泊松比μ是在弹性范围内,其纵横向应变间关系是( )。
(1) A single homogeneous metal crystal formed by the atom fusion of the individual elements constituting the alloy is (). A. Solid solution E. Metal compound C. Mechanical mixture 2 All sub-eutectoid steel at room temperature by the balance of the organization. A. pearlite B. ferrite and pearlite C. cementite and pearlite 3 at 930 ℃ ± 10 ℃, 3 ~ 8h insulation measured the size of the size of the austenite called (). A. initial grain size D. intrinsic grain size C. actual grain size 4 eutectoid steel carbon content is (). A.0.8% B.4.3% C.0.8 ~ 2.06% 5 The steel is heated to above the critical point, cooled slowly after a certain period of time to obtain a near-equilibrium structure, which is called (). A. Normalized B. Tempered C. Annealed 6 Poisson’s ratio μ is within the elastic range, the relationship between the vertical and horizontal strain is ().