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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。
The Gleeble-1500 thermal simulator was used to study the high temperature ductility of 36Mn2V slab samples of microalloyed steel at cooling rates of 3, 8 and 15 ℃ / s and deformation temperatures of 650 ~ 1000 ℃ / s Like fracture morphology, microstructure and micro-alloy precipitation equal changes in the analysis of its embrittlement mechanism. The results show that the third brittle temperature zone of the experimental steel is 950-650 ℃ / s, the embrittlement above 800 ℃ is caused by the single reason of carbonitride, the reason of the embrittlement below 800 ℃ is the precipitation of carbonitride and the intergranular The formation of ferrite film; the rapid cooling rate aggravates the embrittlement at the temperature range of 900-700 ℃; a large amount of carbonitride has been precipitated at 900 ℃. With the decrease of the deformation temperature, the precipitation decreases and the carbon-nitrogen Chemical precipitation.