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利用Formastor热膨胀仪测试了一种含Al中硅中锰双相钢的连续冷却过程的相变行为,采用连续退火热模拟试验机进行了连续退火试验,测试了力学性能,观察了微观组织。结果表明,试验钢以10℃/s的加热速率加热过程中,Ac1和Ac3分别为713℃和918℃,与热力学平衡状态相比,分别需要29℃和58℃的过热度;连续冷却过程中,发生铁素体相变的临界冷速为3~5℃/s之间,贝氏体相变的临界冷速为15~30℃/s;连续退火过程中,随淬火温度的提高,抗拉强度呈逐渐升高的趋势,而伸长率呈逐渐降低的趋势,应变硬化指数n值对淬火温度不敏感。
The Formastor thermal dilatometer was used to test the phase transformation behavior of a continuous phase cooled Mn-Al dual phase steel containing Al. The continuous annealing test was carried out by continuous annealing thermal simulator. The mechanical properties were tested and the microstructure was observed. The results show that Ac1 and Ac3 are 713 ℃ and 918 ℃, respectively, when the test steel is heated at a heating rate of 10 ℃ / s, which requires 29 ℃ and 58 ℃ superheat respectively compared with the thermodynamic equilibrium state. During the continuous cooling process , The critical cooling rate of ferrite transformation is between 3 ~ 5 ℃ / s, and the critical cooling rate of bainite transformation is 15 ~ 30 ℃ / s. In the continuous annealing process, with the increase of quenching temperature, Tensile strength showed a gradual increase in the trend, while the elongation was gradually decreased, the strain hardening index n value of the quenching temperature is not sensitive.