| 摘要: |
| 为了评估高强Q460钢高温冷却后的力学性能,采用电炉对高强Q460钢进行加热升温,再采用自然冷却或浸水冷却方式冷却,然后进行拉伸试验,获得了高温冷却后高强Q460钢的应力应变关系曲线、屈服强度、极限强度、弹性模量和极限伸长率.将高温冷却后高强Q460钢和普通Q235钢的屈服强度、极限强度和弹性模量进行对比.结果表明:高温后高强Q460钢力学性能与常温下力学性能相比有所变化,尤其是当温度超过700℃时,变化基本较大；700℃后,不同冷却方式对高强Q460钢极限强度和极限伸长率影响较大,浸水冷却后钢材的极限强度明显高于自然冷却后钢材的极限强度,而浸水冷却后钢材的极限伸长率则明显低于自然冷却后钢材的极限伸长率；高强Q460钢弹性模量和屈服强度受冷却方式的影响较小；高温冷却后高强Q460钢与普通Q235钢屈服强度、极限强度和弹性模量折减系数存在差异. |
| 关键词: 高强Q460钢 高温 力学性能 |
| DOI：103969/j.issn1007 9629201601029 |
| 分类号: |
| 基金项目:中央高校基本科研业务费专项资金资助项目(106112013CDJZR200006) |
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| Study on Mechanical Properties of High Strength Q460 Steel after Cooling from High Temperature |
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WANG Weiyong, LIU Tianzi
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College of Civil Engineering, Chongqing University, Chongqing 400045, China
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| Abstract: |
| In order to evaluate the mechanical properties of high strength Q460 steel after cooling from high temperature, high strength Q460 steel was heated by electric furnace and cooled down with natural cooling or water cooling, then the tensile test was carried out. The strain stress curve, yield strength, ultimate strength, elastic modulus and ultimate elongation of high strength Q460 steel after cooling from high temperature were determined. The yield strength, ultimate strength and elastic modulus of high strength Q460 steel after cooling from high temperature were compared with that of ordinary Q235 steel. The results show that the mechanical properties of high strength Q460 steel change after high temperature compared with that at room temperature, especially when the temperature exceeds 700℃. When the temperature exceeds 700℃, cooling method has great influence on ultimate strength and ultimate elongation of high strength Q460 steel, the ultimate strength of high strength Q460 steel under water cooling is much higher than that under natural cooling, the ultimate elongation of high strength Q460 steel under water cooling is much lower than that under natural cooling. The influence of cooling method on yield strength and elastic modulus is not notable. The reduction factors of yield strength, tensile strength and elastic modulus of high strength Q460 steel after cooling from high temperature are different from those of ordinary Q235 steel. |
| Key words: high strength Q460 steel high temperature mechanical property |
