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Tensile property and microstructure of Fe-22Mn-0.5C TWIP steel
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2017-09-17 , DOI: 10.1016/j.msea.2017.09.061
Peng Lan , Jiaquan Zhang

The tensile property and microstructure evolution of Fe-22Mn-0.5C TWIP steel under different annealing conditions was experimentally investigated. The matrix phase of this steel after annealing and tensile test is single austenite. The (111) peak is the most pronounced under as annealed condition, however, its intensity decreases significantly after stretched to fracture where (220) peak becomes the most dominant. The yield strength and tensile strength of Fe-22Mn-0.5C TWIP steel mainly decrease as annealing temperature increases, while the total elongation largely increases. The variation in the product of tensile strength and total elongation against temperature is related to the annealing time. The most obvious change in strength and elongation is located between 750 and 850 °C, due to the grain coarsening in the recrystallized matrix. The grain size and density of annealing twins in Fe-22Mn-0.5C TWIP steel increases with increasing anneal temperature. The recrystallized grains grow obviously as annealing temperature and time increase. The influence of annealing time changing by 15 min on grain growth is not as obvious as temperature changing by 100 °C under the current condition. The tensile strength of Fe-22Mn-0.5C TWIP steel decreases as grain size increases while the total elongation increases. The variation in strength and elongation against the square root of grain size follows Hall-Petch's law well. In order to get a good combination of strength and ductility, the grain size between 10 and 30 µm for TWIP steel is preferentially suggested, within which the product of strength and ductility can be easily adjusted to higher than 65 GPa%. High strength and ductility can be obtained in full-recrystallized Fe-22Mn-0.5C TWIP steel with fine-grained matrix. The high strength TWIP steel with tensile strength above 1030 MPa and total elongation about 60% can be prepared by annealing at 650–750 °C for 15–20 min. The high ductility TWIP steel with tensile strength around 900 MPa and total elongation beyond 70% can be manufactured by annealing at 850–950 °C for 5–10 min.



中文翻译:

Fe-22Mn-0.5C TWIP钢的拉伸性能和组织

实验研究了Fe-22Mn-0.5C TWIP钢在不同退火条件下的拉伸性能和组织演变。经过退火和拉伸试验后,该钢的基体相为单奥氏体。(111)峰在退火条件下最为明显,但是,其强度在拉伸至断裂后显着降低,其中(220)峰成为最主要的峰。Fe-22Mn-0.5C TWIP钢的屈服强度和抗拉强度主要随着退火温度的升高而降低,而总伸长率则大大提高。抗拉强度和总伸长率随温度的乘积的变化与退火时间有关。由于再结晶基体中的晶粒粗化,强度和伸长率的最明显变化位于750至850°C之间。Fe-22Mn-0.5C TWIP钢中退火孪晶的晶粒尺寸和密度随着退火温度的升高而增加。随着退火温度和时间的增加,再结晶晶粒明显生长。在当前条件下,退火时间改变15分钟对晶粒长大的影响不如温度改变100°C明显。Fe-22Mn-0.5C TWIP钢的抗拉强度随着晶粒尺寸的增加而降低,而总伸长率则增加。强度和伸长率相对于晶粒尺寸平方根的变化很好地遵循了Hall-Petch的定律。为了获得强度和延展性的良好组合,TWIP钢的晶粒尺寸建议在10至30 µm之间,其中强度和延展性的乘积可轻松调节至高于65 GPa%。具有细晶粒基体的全重结晶Fe-22Mn-0.5C TWIP钢可以获得高强度和延展性。可以通过在650–750°C的温度下退火15–20分钟来制备拉伸强度超过1030 MPa,总伸长率约为60%的高强度TWIP钢。高延展性TWIP钢的抗拉强度约为900 MPa,总延伸率超过70%,可通过在850-950°C的温度下退火5-10分钟来制造。

更新日期:2017-09-17
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