Thermal stability of retained austenite in TRIP-aided cold-rolled steel

被引：0
|
作者：
Zhang Y. [1 ]
Zhao A. [1 ]
Zhao Z. [1 ]
Tang D. [1 ]
机构：
[1] Research Institute of Metallurgy Engineering, University of Science and Technology Beijing
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2011年 / 47卷 / 04期
关键词：
Differential scanning calorimetry Thermal stability; Isothermal transformation; Johnson-Mehl-Avrami equation; Retained austenite; Transformation induced plasticity;
D O I：
10.3901/JME.2011.04.066
中图分类号：
学科分类号：
摘要：
In order to study the thermal stability of retained austenite in the cold-rolled transformation induced plasticity (TRIP) steel, thermal decomposition of retained austenite in a cold-rolled TRIP steel sheet with the composition of 0.25C-1.78Mn-1.23Al-0.54Cu-0.33Ni is investigated by means of differential scanning calorimetry(DSC). The decomposition temperature and the activation energy of the retained austenite in TRIP steel are measured by the Kissinger method, and the decomposition temperature is higher than those of quenched steels. The kinetic parameters n and A are obtained by JMA equation, which are used to predict thermal decomposition kinetic of retained austenite in TRIP steel during isothermal transformation. The results show that the retained austenite has a high stability when bainite isothermal transformation temperature is 420 °C, there is still more than 90% of the retained austenite without decomposing even if the bainite isothermal transformation time is 600 s. The results also show that the amount of retained austenite predicted by JMA equation agrees well with the actual value measured by X ray diffraction (XRD) when bainite isothermal transformation temperature is 420 °C. © 2011 Journal of Mechanical Engineering.
引用
收藏
页码：66 / 70
页数：4
相关论文
共 14 条
  • [1] Jha B.K., Mishra N.S., Microstructural evolution during tempering of a multiphase steel containing retained austenite, Materials Science and Engineering A, 263, 1, pp. 42-55, (1999)
  • [2] Morra P.V., Bottger A.J., Mittemeijer E.J., Decomposition of iron-based martensite. A kinetic analysis by means of differential scanning calorimetry and dilatometry, Journal of Thermal Analysis and Calorimetry, 64, 3, pp. 905-914, (2001)
  • [3] Guan W., Gao Y., Zhai Q., Et al., DSC study on the undercooling of droplet solidification of metal melt, Chinese Science Bulletin, 50, 9, pp. 929-931, (2005)
  • [4] Xiao Y., Li W., Ma Z., Crystallization process in rapidly solidified Al-Nd-Ni amorphous alloy prepared by melt spinning, Transactions of Nonferrous Metals Society of China, 14, 4, pp. 665-669, (2004)
  • [5] Wang Y., Xiao X., Zhou H., Study on transformation kinetics of austenite to pearlite in low alloy steel by DSC, Physics Examination and Testing, 26, 3, pp. 8-10, (2008)
  • [6] Yang C., Shi W., Zhang M., Et al., Austenite transformation kinetics during intercritical annealing for TRIP steel studied by differential scanning calorimetry, Shanghai Metals, 29, 1, pp. 43-47, (2007)
  • [7] Kissiner H.E., Reaction kinetics in differential thermal analysis, Analytical Chemistry, 29, 11, pp. 1702-1706, (1957)
  • [8] Kumar A., Mishra S., Elmer J.W., Et al., Genetic algorithm based optimisation of Johnson Mehl Avrami equation parameters for ferrite to austenite transformation in steel welds, Metallurgical and Materials Transactions A, 36, 1, pp. 15-22, (2005)
  • [9] Hu R., Gao S., Zhao F., Et al., Thermal Analysis Kinetic, (2008)
  • [10] Genderen M.J.V., Isac M., Bottger A., Et al., Aging and tempering behavior of iron-nickel-carbon and iron-carbon martensite, Metallurgical and Materials Transactions A, 28 A, pp. 545-561, (1997)
12