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利用Thermecmastor-z型热模拟试验机测定了高耐蚀型耐大气腐蚀钢的连续冷却转变曲线(CCT曲线),分析了奥氏体形变对试验钢CCT曲线及相变组织的影响,并在光学显微镜下观察了不同冷速下材料的微观组织。结果发现,奥氏体形变扩大了铁素体相变区间,贝氏体相变开始温度升高而结束温度降低,同时贝氏体及马氏体相变的临界冷速提高,表明奥氏体形变促进了铁素体和贝氏体相变,并推迟了马氏体相变的发生。奥氏体形变后在0.5℃/s以下冷速冷却时铁素体含量增多,基体主要为铁素体组织;而无奥氏体形变则基本为贝氏体组织,即使在0.1℃/s冷速下铁素体含量也极少。随着冷却速度的提高,材料发生相变强化,硬度逐步提高。
The continuous cooling transformation curve (CCT curve) of high corrosion resistant atmospheric corrosion resistant steel was measured by Thermecmastor-z thermal simulation tester. The influence of austenite deformation on the CCT curve and phase transformation microstructure of the test steel was analyzed. Microscopic observation of the microstructure of the material at different cooling rates. The results show that the austenite deformation increases the ferrite transformation interval, the bainite transformation start temperature increases and the end temperature decreases, while the critical cooling rate of bainite and martensite transformation shows that the austenite Deformation promotes the ferrite and bainite transformation, and postponed the occurrence of martensitic transformation. After austenite deformation cooling at 0.5 ℃ / s or less, the ferrite content increases, the matrix is mainly ferrite; without austenite deformation is basically bainite, even at 0.1 ℃ / s cold Fast ferrite content is also very small. With the increase of cooling rate, the material phase transformation strengthened, hardness gradually increased.