Revealing Austenite Stability in Fe-30Mn-5Al-0.5C Twining-Induced Plasticity Steel Using Differential Thermal Analysis
Revealing Austenite Stability in Fe-30Mn-5Al-0.5C Twining-Induced Plasticity Steel Using Differential Thermal Analysis
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DOI：
10.1002/srin.202000076
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发表时间：
2020-05-04
影响因子：
2.2
通讯作者：
Bastidas, Jose M.
中科院分区：
文献类型：
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作者：
Bastidas, David M.;Medina, Sebastian F.;Bastidas, Jose M.
通过差热分析（DTA）研究了铸态高合金Fe-30Mn-5Al-0.5C孪生塑性（TWIP）钢中奥氏体的热稳定性。 TWIP 钢在 800 至 1200 oC 的温度范围内进行奥氏体化处理，保温时间为 3 至 100 分钟。采用不同的加热和冷却速率条件，包括0.1和1.0 K s(-1)之间的冷却速率以及0.08、0.33和0.83 K s(-1)三种加热速率。 DTA 结果表明，奥氏体对于所采用的所有热处理都是稳定的。微观结构分析表明，由于 TWIP 钢成分中 Mn 和 Al 的含量较高，因此存在强烈的枝晶偏析。最后，奥氏体化温度显着影响奥氏体晶粒尺寸，而冷却和加热速率的影响不显着。 X 射线衍射分析证实了 DTA 结果，揭示了单相γ-奥氏体晶体结构。
The thermal stability of austenite in as-cast high-alloyed Fe-30Mn-5Al-0.5C twining-induced plasticity (TWIP) steel has been studied by differential thermal analysis (DTA). TWIP steels are subjected to austenization treatments in the temperature range between 800 and 1200 oC and holding times between 3 and 100 min. Different heating and cooling rate conditions are applied, including cooling rates between 0.1 and 1.0 K s(-1) and three heating rates 0.08, 0.33, and 0.83 K s(-1). The DTA results show that austenite is stable for all of the heat treatments applied. Microstructural analysis reveals a strong dendritic segregation due to the high percentages of Mn and Al in the composition of the TWIP steel. Finally, the austenitization temperature significantly influences the austenite grain size, unlike the cooling and heating rates that have an insignificant effect. The DTA results are confirmed by the X-ray diffraction analysis, revealing a single-phase gamma-austenite crystal structure.