Stored energy in ultrafine-grained 316L stainless steel processed by high-pressure torsion
Stored energy in ultrafine-grained 316L stainless steel processed by high-pressure torsion
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DOI：
10.1016/j.jmrt.2017.05.001
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发表时间：
2017-10-01
影响因子：
6.4
通讯作者：
Gubicza, Jeno
中科院分区：
文献类型：
--
作者：
El-Tahawy, Moustafa;Huang, Yi;Gubicza, Jeno
采用差示扫描量热法（DSC）研究了严重变形超细晶（UFG）316L不锈钢中储存的能量。通过高压扭转（HPT）处理样品N = 10圈。在DSC热谱图中，观察到两个峰。第一个峰是放热的，与空位和位错的湮灭有关。在此恢复期间，相组成和平均晶粒尺寸几乎不变。计算了位错中储存的能量，并与DSC放热峰中释放的热量进行了比较。这种差异与浓度接近5.2 × 10（-4）的类空位缺陷的湮灭有关。第二个DSC峰是吸热的，这是由α '-马氏体转变为γ-奥氏体引起的，但在此温度范围内也发生了位错湮灭和适度的晶粒长大。测得逆马氏体相变的比能约为-11.7J/g。(C)2017年巴西冶金、材料和采矿协会。出版社：Elsevier Editora Ltda这是一个在CC BY-NC-ND许可下的开放获取文章
The energy stored in severely deformed ultrafine-grained (UFG) 316L stainless steel was investigated by differential scanning calorimetry (DSC). A sample was processed by high-pressure torsion (HPT) for N = 10 turns. In the DSC thermogram, two peaks were observed. The first peak was exothermic and related to the annihilation of vacancies and dislocations. During this recovery, the phase composition and the average grain size were practically unchanged. The energy stored in dislocations was calculated and compared with the heat released in the exothermic DSC peak. The difference was related to the annihilation of vacancy-like defects with a concentration of similar to 5.2 x 10(-4). The second DSC peak was endothermic which was caused by a reversion of alpha '-martensite into gamma-austenite, however in this temperature range dislocation annihilation and a moderate grain growth also occurred. The specific energy of the reverse martensitic phase transformation was determined as about -11.7J/g. (C) 2017 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license