采用Gleeble-1500热模拟试验机测试了含钒低合金钢铸坯的高温延塑性,利用扫描电镜、金相显微镜对断口形貌及金相组织进行分析.低合金钢的第Ⅰ脆性温度区在Ts～1 370℃之间,第Ⅲ脆性温度区在915～710℃之间.第Ⅲ脆性区间由奥氏体低温域晶界滑移楔形裂纹造成的沿晶脆性断裂和奥氏体晶界先共析铁索体薄膜造成的沿晶韧性断裂两部分组成.钢中的Ⅴ对钢的第Ⅲ脆性凹槽的影响比较大,脆化向低温区域延伸.
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