SAE8640合金钢280 mm×325 mm连铸坯的高温力学性能

作者：王宁涛; 阮士朋; 段路昭; 王利军

来源：特殊钢, 2018, 39(01): 68-70.

• SAE8640合金钢
• 280 mm×325 mm连铸坯
• 高温
• 断面收缩率
• 脆性区
• 断口

采用Gleeble 1500热模拟试验机对SAE8640钢280 mm×325 mm连铸坯(/%:0.41C,0.20Si,0.80Mn,0.005S,0.014P,0.46Cr,0.43Ni,0.21Mo,0.043Alt,0.001 10,0.005 4N)的5501 200℃力学性能进行了测定,并应用扫描电镜观察了拉力试样的断口形貌。结果表明,SAE8640钢有明显的3个脆性区:Ⅰ脆性区>1 200℃,Ⅱ脆性区9501 000℃,Ⅲ脆性区650750;该钢9501 000℃的断面收缩率为60%,拉伸断口为脆性河流状花样,应避免在该温度范围进行轧制,该钢650750℃的断面收缩率≥65%,拉伸断口为韧性断裂,可满足连铸坯矫直时塑性的要求。