【摘要】 本文研究了微合金化元素V、V-N及V-N-Ti对钢筋钢冲击韧性(室温到-70℃)的影响及断裂行为。经轧后空冷的V-N钢和V-N-Ti钢,获得较细小的铁素体晶粒(d=14～15μm),较低的珠光体体积分数和较低的脆性转化温度。轧后空冷钢筋钢的冲击韧性取决于组织中珠光体体积分数和铁素体晶粒直径。如出现魏氏组织室温冲击韧性略有提高。钢中夹杂物对冲击韧性不利。更多还原

【Abstract】 The effects of microalloying elements V, V-N, and V-N-Ti on the impact toughness and on the behavior of fracture of reinforced bars have been studied in the temperature range from -70° to 16℃. All the V-N and V-N-Ti alloyed steels hot rolled followed by air cooling have finer ferrite grains (d=14-15μm) smaller volume fraction of pearlite and lower brittle transition temperature. It shows that the impact toughness of reinforced bars hot-rolled followed by air-cooling is dependent on the volume fraction of pearlite and the diameter of ferrite grains. If widmastatten ferrite is present, then the impact toughness of steel is increased somewhat at room temperature. Inclusion is harmful to impact toughness.更多还原