Abstract Grain boundary engineering in the austenitic low-density Fe-Mn-Al-C-Cr steel was implemented by simple annealing treatment at 1100 °C for 30 min after hot rolling with 66% and 80% reduction. The fractions of low-Σ coincidence site lattice (CSL) boundaries have exceeded 60% after hot rolling, and reached 77% after annealing treatment. Whether after hot rolling or annealing, the fractions of Σ9 and Σ27 in samples with 80% reduction were obviously higher than those with 66% reduction. It indicated that hot rolling reduction was the key to realize grain boundary character distribution optimization. The results showed that the connectivity of random high angle grain boundaries was broken through the formation of large grain clusters only occurred in the sample with 80% reduction, which inhibited the grain growth during annealing. It provided a convenient method to carry out grain boundary engineering.

中文翻译：

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热轧压下率和退火处理对奥氏体低密度Fe-Mn-Al-C-Cr钢晶界特征分布的影响

摘要 奥氏体低密度Fe-Mn-Al-C-Cr钢的晶界工程在热轧66%和80%压下率后，通过1100℃、30min的简单退火处理实现。热轧后低Σ重合点晶格（CSL）边界的比例已超过60%，退火处理后达到77%。无论是热轧后还是退火后，80%压下率试样中Σ9和Σ27的含量均明显高于压下率66%的试样。表明热轧压下量是实现晶界特征分布优化的关键。结果表明，随机大角度晶界的连通性被破坏，大晶粒簇的形成仅发生在压下量为80%的样品中，这抑制了退火过程中的晶粒长大。