智能型建筑耐火钢Q420FRE焊接性能研究
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摘要
以智能耐火钢Q420FRE为研究对象,采用Gleeble3800热模拟试验机对其焊接热影响区组织转变及焊接性进行研究,并对40、60 mm厚的Q420FRE钢板进行了斜Y坡口焊接裂纹试验。结果表明,Q420FRE智能型耐火钢,在较大的冷却速度范围内(3~600 s),组织主要为粒状贝氏体,硬度值HV_(0.2)186.7~207.4,变化不大。在较大的线能量输入焊接,焊接热影响区粗晶区组织稳定,性能稳定。40、60 mm的Q420FRE钢板采用BHG-2焊丝气体保护焊,防止焊接冷裂纹产生的预热温度分别为50、75℃。
The construction of intelligent Q420 FRE refractory steel as the research object, using Gleeble3800 thermal simulation testing machine on the microstructure transformation and weldability, welding heat affected zone, and Q420 FRE of 40 and 60 mm thick steel plate inclined Y groove welding crack tests had been carried out. The results show that the Q420 FRE intelligent refractory steel, in a larger range of cooling rate(3~600 s), the microstructure mainly for granular bainite, hardness value ranges are HV_(0.2)186.7~207.4. Within the large energy input welding, the welding heat affected zone coarse grain zone group stability, stable performance, can adapt to the large heat input welding. The thickness with 40 and60 mm steel plate of Q420 FRE are gas shielded arc welding with the BHG-2 wire, and the preheating temperature is 50 ℃and 75 ℃ for preventing the welding cold cracking, respectively.
The construction of intelligent Q420 FRE refractory steel as the research object, using Gleeble3800 thermal simulation testing machine on the microstructure transformation and weldability, welding heat affected zone, and Q420 FRE of 40 and 60 mm thick steel plate inclined Y groove welding crack tests had been carried out. The results show that the Q420 FRE intelligent refractory steel, in a larger range of cooling rate(3~600 s), the microstructure mainly for granular bainite, hardness value ranges are HV_(0.2)186.7~207.4. Within the large energy input welding, the welding heat affected zone coarse grain zone group stability, stable performance, can adapt to the large heat input welding. The thickness with 40 and60 mm steel plate of Q420 FRE are gas shielded arc welding with the BHG-2 wire, and the preheating temperature is 50 ℃and 75 ℃ for preventing the welding cold cracking, respectively.
引文
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[5]Bhadeshia H K D,Honeycombe S R.Steels:microstructure and properties[M].Amsterdam:Elsevier B.V.,2006.
[6]董毅,时晓光,韩斌,等.冷却工艺对低Si含Cr热轧双相钢组织和性能的影响[J].金属热处理,2012,37(11):66-69,74.
[7]冯科,韩志伟.热处理钢板气雾冷却数学模型的开发与应用[J].工业加热,2010,39(3):12-14,19.
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