EBSD analysis of strain distribution and evolution in ferritic-Pearlitic steel under cyclic deformation at intermediate temperature
EBSD analysis of strain distribution and evolution in ferritic-Pearlitic steel under cyclic deformation at intermediate temperature
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DOI：
10.1016/j.matchar.2022.112293
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发表时间：
2022-09-28
影响因子：
4.7
通讯作者：
Ramirez, Antonio J.
中科院分区：
文献类型：
--
作者：
Zhang, Shutong;Romo, Sebastian;Ramirez, Antonio J.
循环加载引起的应变积累影响低合金钢在循环运行条件下的组织和力学性能。本文对一种铁素体-珠光体SA204 C级钢进行了应变控制低周疲劳试验的综合分析，以了解铁素体-珠光体钢的组织变形和应变局部化。低周疲劳试验在Gleeble(R)热机械模拟器上进行，应变幅值分别为0.008、0.01、0.015和0.02，在250℃等温条件下进行。低周疲劳分析表明，应变局部化发生在铁素体-渗碳体界面和铁素体-珠光体界面。用OM、SEM、EBSD和纳米压痕分析的表征结果表明，铁素体-珠光体组织中的晶粒取向偏差是由于应变积累随着应变幅值和加载周期的增加而增加的。
Strain accumulation as a result of cyclic loading affects the microstructure and mechanical performance of low -alloy steels under cyclic operation conditition. This manuscript presents a comprehensive analysis of a ferritic-pearlitic SA204 Grade C steel under strain-controlled low-cycle fatigue tests to understand the microstructural deformation and strain localization in the ferritic-pearlitic steel. Low-cycle fatigue tests were performed in a Gleeble (R) thermo-mechanical simulator at 0.008, 0.01, 0.015, and 0.02 strain amplitudes under an isothermal condition at 250 degrees C. The microstructure evolution during cyclic loading was evaluated using the samples from interrupted 0.01 strain amplitude tests. The LCF analysis shows strain localization at the ferrite-cementite in-terfaces and ferrite-pearlite interfaces. The characterization results using OM, SEM, EBSD, and nanoindentation analysis reveals the grain misorientation in the ferritic-pearlitic microstructure due to strain accumulation in-creases with the strain amplitudes and the loading cycles.