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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素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。
The high temperature ductility of vanadium bearing low alloy steel slab was tested by Gleeble-1500 thermal simulation tester. The fracture morphology and microstructure were analyzed by scanning electron microscope and optical microscope. The first brittle temperature zone of low alloy steels is between Ts ~ 1 370 ℃ and the third brittle temperature zone is between 915 ~ 710 ℃. The third brittle zone consists of two parts, along the ductile fracture caused by the brittle fracture along the grain boundaries and the proeutectoid ferrite thin film caused by the austenite grain boundary slip and austenite grain boundary sliding. The V in steel has a greater impact on the third brittleness of the steel groove, embrittlement to extend to the low temperature region.