The nature of quasicleavage fracture in tempered 5.5Ni steel after hydrogen charging
The nature of quasicleavage fracture in tempered 5.5Ni steel after hydrogen charging
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充氢后回火5.5Ni钢准解理断裂性质
DOI：
10.1007/bf02645559
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
J. Morris
中科院分区：
文献类型：
--
作者：
Y. Kim;J. Morris
经调质后的5.5Ni钢经加氢脆化，在室温空气中破碎。主要断裂方式为穿晶准断裂。采用扫描电子断口和透射电子显微镜对断口试样的准断裂面进行了研究。后者是通过在断口表面镀镍并减薄，使断口包含在试样对电子束透明的区域内来制备的。断口沿马氏体板条边界延伸。此外，在断裂面下方的材料中经常发现条状微裂纹。这些结果表明，该钢的穿晶氢脆主要是一种板条间裂纹现象。由于板条边界面趋向于{110}，结果也解释了在脆化试样中{110}准解理的普遍存在，这与在低于韧脆转变温度的未带电试样中发现的{100}解理形成对比。
Quenched and tempered 5.5Ni steel was embrittled by hydrogen charging and broken in air at room temperature. The primary fracture mode was transgranular quasicleavage. The quasicleavage facets were studied by scanning electron fractography and by transmission electron microscopy of profile fractographic specimens. The latter were prepared by plating the fracture surface with nickel and thinning so that the fracture surface was contained within the region of the specimen that was transparent to the electron beam. The fracture surface generally followed martensite lath boundaries. In addition, interlath microcracks were frequently found in the material immediately beneath the fracture surface. These results suggest that transgranular hydrogen embrittlement in this steel is primarily an interlath cracking phenomenon. Since the lath boundary planes tend to lie in {110}, the results also explain the prevalence of {110} quasicleavage in the embrittled specimens, which contrasts with the {100} cleavage found in uncharged specimens broken below the ductile-to-brittle transition temperature.