New-type steel plate with ultra high crack-arrestability
New-type steel plate with ultra high crack-arrestability
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超高止裂新型钢板
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
H. Mabuchi
中科院分区：
文献类型：
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作者：
T. Ishikawa;Y. Nomiyama;Y. Hagiwara;H. Yoshikawa;S. Oshita;H. Mabuchi
通过控制表层组织，研制出一种新型钢板。表面层由超细晶粒铁素体显微组织组成，即使在低温下也具有优异的断裂韧性。当不稳定的脆性裂纹在所研制的钢板中扩展时，由于具有超细晶粒显微组织的表面层，容易形成剪切唇。由于不稳定的运行裂纹行为受到与广泛塑性变形相关的侧韧带（剪切唇）的强烈影响，因此剪切唇的增强形成可以提高裂纹的稳定性。本文介绍了研制的抗拉强度为HT500MPa级的船用钢板。使用大规模断裂试验（包括超宽双相ESSO试验）的断裂力学研究表明，所开发的钢板具有超高的裂纹稳定性。还证实了该板具有足够的性能，包括可焊接性和可加工性，用于造船。
A new-type steel plate has been developed by controlling the microstructure of the surface layers. The surface layer consists of ultra fine grain ferrite microstructure, which provides excellent fracture toughness even at cryogenic temperature. When an unstable brittle crack propagates in the developed steel plate, shear-lips can be easily formed due to the surface layers with ultra fine grain microstructure. Since unstable running crack behavior is strongly affected by side-ligaments (shear-lips), which are associated with extensive plastic deformation, enhanced formation of the shear-lips can improve crack arrestability. This paper describes the developed steel plates of HT500MPa tensile strength class for shipbuilding use. Fracture mechanics investigations using large-scale fracture testings (including ultrawide duplex ESSO tests) clarified that the developed steel plates have ultra high crack-arrestability. It was also confirmed that the plates possess sufficient properties, including weldability and workability, for ship building use.