Hydrogen desorption and cracking associated with martensitic transformation in Fe-Cr-Ni-Based austenitic steels with different carbon contents
Hydrogen desorption and cracking associated with martensitic transformation in Fe-Cr-Ni-Based austenitic steels with different carbon contents
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DOI：
10.1016/j.ijhydene.2017.08.209
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发表时间：
2017-10
影响因子：
7.2
通讯作者：
M. Koyama;Takuro Ogawa;Dingshun Yan;Y. Matsumoto;C. Tasan;K. Takai;K. Tsuzaki
中科院分区：
文献类型：
--
作者：
M. Koyama;Takuro Ogawa;Dingshun Yan;Y. Matsumoto;C. Tasan;K. Takai;K. Tsuzaki
采用充氢拉伸试验、低温热脱附谱和原位变形试验研究了Fe-19 Cr-8 Ni-0.05C和Fe-19 Cr-8 Ni-0.14C亚稳奥氏体钢的氢脆行为。结合显微组织分析，确定了Fe-19 Cr-8 Ni-0.05C钢的{110}α和{100}α裂纹以及Fe-19 Cr-8 Ni-0.14C钢的{100}α裂纹的穿晶路径。Fe-19 Cr-8 Ni-0.05C钢在α′马氏体完全覆盖晶界时也发生沿晶开裂。热致α′马氏体的存在增加了氢影响区，变形诱发α ′马氏体相变增加了氢的局部迁移率，这两个因素促进了钢的穿晶和沿晶氢辅助裂纹的发生。此外，（3）最大Schmid因子驱动的变形带相交和裂纹尖端的应力集中有助于氢辅助穿晶开裂。
The hydrogen embrittlement behavior of Fe-19Cr-8Ni-0.05C and Fe-19Cr-8Ni-0.14C metastable austenitic steels was investigated using tensile tests under hydrogen-charging, cryogenic thermal desorption spectroscopy, and in situ deformation experiments. Coupled with post-mortem microstructure characterization, the cracking paths were clarified to be transgranular along {110}αand {100}αin the Fe-19Cr-8Ni-0.05C steel and {100}αin the Fe-19Cr-8Ni-0.14C steel. Intergranular cracking also occurred in the Fe-19Cr-8Ni-0.05C steel when α′-martensite thoroughly covered the grain boundaries. Occurrence of the transgranular and intergranular hydrogen-assisted cracking in the steels is assisted by (1) an increase in the hydrogen-affected zone associated with presence of thermally induced α′-martensite, and (2) an increase in the local mobility of hydrogen that occurs with the deformation-induced α′-martensitic transformation. Additionally, (3) the transgranular hydrogen-assisted cracking is assisted by the intersection of deformation bands driven by the maximum Schmid factor and the stress concentration at the crack tip.