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采用热力模拟试验机、光学显微镜、显微硬度计研究了耐蚀钢12CuCrNiV在不同冷却速率下的连续冷却组织转变规律,并绘制其CCT曲线,同时研究了形变温度和冷却速度对耐蚀钢热变形后的组织和硬度的影响规律。结果表明:连续冷却转变情况下,耐腐蚀钢在冷速小于15℃/s时,有铁素体转变;冷速小于1℃/s时,有珠光体转变;冷速在0.5~20℃/s之间时,有贝氏体转变。控制冷速在5~15℃/s可得到铁素体和贝氏体复相组织。随变形温度的降低,试验钢形变过程中形变诱导铁素体相变现象显著,且伴随有M/A岛生成;随冷却速度的增高,形变诱导相变现象减弱,M/A岛数量减少。与连续冷却试验相比较,形变诱导析出现象明显,其硬度增量为40~50HV,形变可使试验钢的析出向更高冷速移动。
The structure of 12CuCrNiV steel under different cooling rates was studied by means of thermodynamic simulator, optical microscope and microhardness tester, and the CCT curves were drawn. The effect of deformation temperature and cooling rate on corrosion resistance of steel Deformation after the organization and hardness of the law. The results show that when the cooling rate is less than 15 ℃ / s, the corrosion resistance of the corrosion resistant steel changes with the ferrite transformation. When the cooling rate is less than 1 ℃ / s, the transformation of the pearlite takes place. The cooling rate ranges from 0.5 ℃ to 20 ℃ / s, there is bainite transformation. Control of cooling rate at 5 ~ 15 ℃ / s can be ferrite and bainite complex. With the decrease of deformation temperature, the deformation induced deformation of ferrite during the deformation of the test steel is remarkable, accompanied by the formation of M / A island. With the increase of cooling rate, the deformation induced transformation is weakened and the number of M / A islands decreases. Compared with the continuous cooling test, the deformation induced precipitation phenomenon is obvious, the hardness increment is 40 ~ 50HV, and the deformation can make the precipitation of the test steel move towards higher cooling speed.