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一 选择题 解答:11.B 12.3～30N/mm~2s_1 13.B 14.A 15.A 16.室温下冲击,试验温度在10～35℃17.B 18.C 19.A 二 填充题 解答:3.软硬 4.B,90 5.不锈钢,耐热钢,耐磨钢,超高强度钢 6.弹性变形、屈服、均匀塑性变形和局部塑性变形 7.图示法、指针法 8.3个9.大小,方向,中心,相反 10.10倍 11.深度 12.中心 三 问答题 解答: 1 布氏硬度的试验原理是用一定直径D的淬火钢球或硬质合金球,以一定大小的试验力(N)压入试佯表面,经规定保持时间后卸除试验力,试佯表面将残留压痕,测定出压痕球形面积(mm~2)。布氏硬度值(HB)即为试验力除以压痕球形表面积S所得的商乘以系数0.102。 2 断后伸长率方δ的测定是在试样拉断后进行的,将试
A multiple choice answer: 11.B 12.3 ~ 30N / mm ~ 2s_1 13.B 14.A 15.A 16. impact at room temperature, the test temperature at 10 ~ 35 ℃ 17. B 18.C 19.A two fill questions answer : 3. Hard and soft 4.B, 90 5. Stainless steel, heat-resistant steel, wear-resistant steel, high strength steel 6. Elastic deformation, yielding, uniform plastic deformation and local plastic deformation 7. Graphic method, the pointer method 8.3 9. Size, direction, center, on the contrary 10.10 times 11. Depth 12. Center III Question Answer: 1 Brinell hardness test principle is to use a certain diameter of the quenched steel ball or carbide ball to a certain amount of test force (N) is pressed into the surface of the test specimen, and the test force is removed after the specified holding time. The indentation on the test surface is determined. The indentation spherical area (mm2) is determined. Brinell hardness (HB) is the quotient obtained by dividing the test force by the indentation spherical surface area S by a factor of 0.102. 2 Elongation rate after fracture δ measurement is carried out after the specimen pulled off, the test