采用Gleeble-1500热模拟试验机研究了微合金钢36Mn2V连铸坯试样在冷速为3、8和15℃/s,变形温度为650～1000℃/s之间的高温塑性,并通过试样的断口形貌、显微组织和微合金析出相等的变化情况分析其脆化机理。结果表明：实验钢的第Ⅲ脆性温度区为950～650℃/s,800℃以上脆化是由碳氮化物单一原因造成,800℃以下脆化的原因则是碳氮化物的析出和沿晶界铁素体膜的形成;冷速过快加剧900～700℃温度区间的脆化;900℃已有大量碳氮化物的析出,随变形温度的降低,析出量减少,750℃仍然存在碳氮化物的析出。
Hot ductility of micro-alloyed steel 36Mn2V continuous cast slabs was studied by using a Gleeble-1500 thermal simulator at 650-1000 ℃ with the cooling rates of 3,8 and 15 ℃/s.The brittleness mechanism of the steel was analyzed by observation of fracture surface microstructure and precipitation of the specimens.The results show that the brittle zone of the tested steel is 950 ℃ to 650 ℃.The embrittlement above 800 ℃ is mainly caused by carbonitride precipitation,while below 800 ℃ it is caused by the carbonitride precipitation and the form ation of intergranular ferrite film.The increasing of cooling rate promotes the brittleness in the temperature range of 900 ℃ to 700 ℃.A large amount of carbonitride is precipitatesd at 900 ℃,and with the decrease of deformation temperature,the precipitation reduces,which is still observed at 750 ℃.
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