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采用Gleeble1500热模拟试验机对SAE8640钢280mm×325mm连铸坯(/%:0.41C,0.20Si,0,80Mn,0.005S,0.014P,0.46Cr,0.43Ni,0.21Mo,0.043Ah,0.00110,0.0054N)的550~1200℃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〉1200℃,Ⅱ脆性区950-1000℃,Ⅲ脆性区650~750℃;该钢950~1000℃的断面收缩率为60%,拉伸