Intragranular Ferrite Formation Mechanism and Mechanical Properties of Non‐quenched‐and‐tempered Medium Carbon Steels
Intragranular Ferrite Formation Mechanism and Mechanical Properties of Non‐quenched‐and‐tempered Medium Carbon Steels
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DOI：
10.1002/srin.200806143
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发表时间：
2008-05
影响因子：
2.2
通讯作者：
Z. Yang;Fuming Wang;Sen Wang;B. Song
中科院分区：
文献类型：
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作者：
Z. Yang;Fuming Wang;Sen Wang;B. Song
定量研究了非调质中碳钢中夹杂物的类型和尺寸分布。研究了含钛复合夹杂物对晶内铁素体形成的影响。为了确定晶内铁素体形成的冷却速度范围，获得了试验钢的连续冷却转变(CCT)图。在室温下对试验钢的力学性能进行了测定。结果表明，随着钛含量的增加，可作为晶内铁素体形核的复合夹杂物的含量增加，夹杂物尺寸变小。在0.5~2.5℃/S的冷却速度范围内，大量的晶内铁素体生成，而在2℃/S的冷却速度下，组织主要为针状铁素体。随着晶内铁素体的形成，在保持相同强度水平的情况下，韧性提高了约50%。
The type and size distribution of inclusions in non quenched‐and‐tempered medium carbon steels were investigated quantitatively. The effect of Ti containing complex inclusions on the formation of intragranular ferrite was studied. The continuous cooling transformation (CCT) diagrams of the tested steels were obtained for determining the cooling rate range of the formation of intragranular ferrite. The mechanical properties of the tested steels were determined at room temperature. The results show that with increasing Ti content, the fraction of Ti containing complex inclusions, which could act as nuclei for intragranular ferrite, increased and the inclusion size became smaller. In the cooling rate range of 0.5~2.5°C/s, plenty of intragranular ferrite formed, while at the rate of 2°C/s, the microstructure was mainly acicular ferrite. With the formation of intragranular ferrite, the toughness was enhanced by about 50% keeping the same strength level for the studied steels.