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Test for the lab N93 "Macro- and micro-analysis" Set of questions Ng 4 1. Main distinctive features of BRITTLE fracture are a) absence of neck, glazing surface and low roughness of a fracture; b) presence of neck, rough surface of a fracture; c) presence of two zones - smooth and rough. 2. Main distinctive feature of ductile fracture is ....* a) neck appearance; b) glazing surface of a fracture; c) low roughness of fracture surface. 3. Arrange steel specimens 1, 2, 3 by quality from the worst to the best. 1 2 3 a) Specimen 2 Specimen 1 - Specimen 3; b) Specimen 1 Specimen 2 Specimen 3; c) Specimen 3 Specimen 2 Specimen 1. 4. Generally the structure of ingots and forging articles can be studied with ... a) superficial etching; b) visual observation; c) deep etching. 5. Where typical CHEMICAL inhomogeneity in steels can be found? a) at comparison of high-carbon steel structure and superficial layer subjected to superficial hardening by high frequency currents; b) at comparison of low-carbon steel chemical composition and superficial layer saturated with carbon; c) at zone of neck in steel specimen after failure. 6. What is maximum magnification of optical microscopes engineers use for micro-structural analysis: a) up to 500 times; b) up to 100 times; c) up to 1500 times. 7. What is the typical procedure of macro-section preparation for macro-analysis? a) take entire article or cut it piece, mill horizontal surface for studying, polish with sand paper. b) take entire article or cut it piece, immerse to 5% solution of H2SO4 in water; c) take entire article or cut it piece, mill horizontal surface for studying and immerse to 10% solution of HNO3 in water; 8. What is standard magnification of microscope has to be adjusted for determination steels grain size numbers from -3 up to 0? a) 100; b) 400; C) 25. 9. Arrange steel specimen subjected previously to superficial hardening by high frequency currents in accordance of the quality from the best to the worst. Specimen 3 Specimen 1 Specimen 2 a) Specimen 1 Specimen 2 Specimen 3; b) Specimen 1 Specimen 3 Specimen 2; c) Specimen 3 Specimen 2 Specimen 1. 10. How many total grain size numbers can be found at steels micro-structural analysis? a) 20; b) 10; c) 18