采用Gleeble2000试验机测试了HG70钢连铸坯的高温力学性能,利用金相显微镜、扫捕电镜、透射电镜观察了第Ⅲ脆性温度区内拉伸试样断口部位的显微组织及形貌.结果表明HG70钢的高温强度较好,500℃时的抗拉强度为550 MPa第二相引起塑性凹槽区的温度范围与晶界铁素体网膜导致塑性凹槽区的温度范围连接叠加,导致第山脆性温度口袋区谷底低、平谷宽.
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