Role of Different Kinds of Boundaries against Cleavage Crack Propagation in Low Temperature Embrittlement of Low-Carbon Martensitic Steel
Role of Different Kinds of Boundaries against Cleavage Crack Propagation in Low Temperature Embrittlement of Low-Carbon Martensitic Steel
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不同类型边界对低碳马氏体钢低温脆化中解理裂纹扩展的作用
DOI：
10.1007/s11661-017-4107-9
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Nobuhiro Tsuji
中科院分区：
文献类型：
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作者：
Mizuki Tsuboi;Akinobu Shibata;Daisuke Terada;Nobuhiro Tsuji
本文从显微组织和晶体学角度研究了低碳钢板条马氏体低温脆化与显微组织的关系。 98 K（-175 °C）小型夏比冲击试验后，试样的断口主要由与马氏体晶面{001}面平行的解理断裂面组成。通过微裂纹扩展的晶体学取向分析，我们发现分隔不同马氏体变体的边界具有较大的{001}解理面取向差角，可以抑制裂纹扩展。然后得出结论，属于同一贝恩变形组的马氏体变体聚集体的尺寸可以控制马氏体钢的低温脆性。
The present paper investigated the relationship between low-temperature embrittlement and microstructure of lath martensite in a low-carbon steel from both microstructural and crystallographic points of view. The fracture surface of the specimen after the miniaturized Charpy impact test at 98 K (−175 °C) mainly consisted of cleavage fracture facets parallel to crystallographic {001} planes of martensite. Through the crystallographic orientation analysis of micro-crack propagation, we found that the boundaries which separated different martensite variants having large misorientation angles of {001} cleavage planes could inhibit crack propagation. It was then concluded that the size of the aggregations of martensite variants belonging to the same Bain deformation group could control the low-temperature embrittlement of martensitic steels.