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基于传统高Cr铁素体耐热钢系的合金成分,对合金元素进行了一定范围内的调整,设计出一种新型高Cr铁素体系耐热钢。该钢的回火组织主要为大量板条马氏体+少量铁素体组成。在差分膨胀仪上测定了不同冷却速度新钢的热膨胀曲线,进而制定该钢种的连续冷却转变(CCT)曲线。结果表明,随着冷却速度升高,相变点降低,马氏体板条宽度变小,铁素体由连续长条状向多边形结构和短条状转变,硬度值升高。
Based on the alloy composition of the traditional high-Cr ferritic heat-resistant steel system, alloying elements were adjusted within a certain range, and a new type of high-Cr ferritic heat-resistant steel was designed. The tempering of the steel is mainly composed of a large number of lath martensite + a small amount of ferrite. In the differential dilatometer, the thermal expansion curves of new steel with different cooling rates were measured, and then the continuous cooling transformation (CCT) curve of the steel was established. The results show that as the cooling rate increases, the transformation point decreases, the width of martensite lath becomes smaller, the ferrite changes from continuous strip to polygonal structure and short strip, and the hardness increases.