Comparison of Impact Properties for Carbon and Low Alloy Steels

• 来源期刊: 材料科学技术学报：英文版
• 学科: 工学
• 关键词: 低合金钢 性能比较 碳钢 冲击性能 低合金结构钢 温度冲击试验 韧脆转变温度 解理断裂应力
• 年，卷（期）: 2011,（10）
• 页码范围: 931-936
• 页数: 6页
• 分类号: TG142.33|TG174.42
• 语种: 英文

摘要

The impact properties of hot rolled carbon steel （used for the manufacture of reinforcement steel bars） and the quenched ＆ tempered （Q＆T） low alloy steel （used in the pressure vessel industry） were determined. The microstructure of the hot rolled carbon steel contained ferrite/pearlite phases, while that of the quenched and tempered low alloy steel contained bainite structure. Impact properties were determined for both steels by instrumented impact testing at temperatures between -150 and 200℃. The impact properties comprised total impact energy, ductile to brittle transition temperature, crack initiation and propagation energy, brittleness transition temperature and cleavage fracture stress. The Q＆T low alloy steel displayed much higher resistance to ductile fracture at high test temperatures, while its resistance to brittle fracture at low test temperatures was a little higher than that of the hot rolled carbon steel. The results were discussed in relation to the difference in the chemical composition and microstructure for the two steels.