Fatigue Fracture Surface of Ultra-Fine Grained Ferritic Stainless Steels
Fatigue Fracture Surface of Ultra-Fine Grained Ferritic Stainless Steels
复制标题
超细晶粒铁素体不锈钢的疲劳断口表面
DOI：
10.2472/jsms.57.134
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
R. Ebara
中科院分区：
文献类型：
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作者：
Y. Matsumura;K. Kishi;Y. Ishibashi;R. Ebara
采用机械合金化后热挤压的方法制备了Fe-2.25Cr-1 Mo-1 Zr、Fe-25 Cr-1 Zr和Fe-13 Cr-8 Ni-2 Mo-1 Zr等超细晶铁素体不锈钢。在473 K下对这些钢的平面圆棒试样进行了轴向疲劳寿命试验。在473 K下，这些钢的疲劳强度高于常规钢，如SAE 8740和SNB 16。Fe-2.25Cr-1 Mo-1 Zr、Fe-13 Cr-8 Ni-2 Mo-1 Zr和Fe-25 Cr-1 Zr在3 × 106次循环下的疲劳强度表示为最大应力，分别为1150、1150和1350 MPa。穿晶断裂面主要出现在裂纹萌生和扩展区域。在裂纹扩展区的限定区域观察到条纹。可以得出结论，0.2μm超细晶粒度的铁素体不锈钢具有较高的疲劳强度，这在很大程度上取决于裂纹萌生的延迟。
Ferritic stainless steels such as Fe-2.25Cr-1Mo-1Zr, Fe-25Cr-1Zr and Fe-13Cr-8Ni-2Mo-1Zr with ultra-fine grain size of 0.2μm were prepared by hot extrusion after mechanical alloying. Axial fatigue life tests for plane round bar specimens of these steels were conducted at 473K. The higher fatigue strengths of these steels at 473K were observed as compared with those of conventional steels such as SAE8740 and SNB16. Fatigue strength expressed as maximum stress at 3 × 106 cycles for Fe-2.25Cr-1Mo-1Zr, Fe-13Cr-8Ni-2Mo-1Zr and Fe-25Cr-1Zr were 1150, 1150 and 1350MPa, respectively. Transranular fracture surfaces were predominantly observed at crack initiation and propagation area. Striation was observed at defined region of crack propagation area. It can be concluded that the higher fatigue strength of ferritic stainless steels with ultra-fine grain size of 0.2μm is strongly governed by delay of crack initiation.
高温下超细晶粉末冶金铝合金细小疲劳裂纹的萌生和扩展行为
DOI：
--
发表时间：
2006
期刊：
Journal of the Society of Materials Science, Japan 55-56(in press)
影响因子：
--
作者：
ATSUSHI SUGETA
通讯作者：
ATSUSHI SUGETA
DOI：
--
发表时间：
2005
期刊：
Proceedings of Joint Conference of HSLA Steels 2005 and ISUGS 2005
影响因子：
--
作者：
J.Saikawa;Y.Sato;T.Taira;A.Ikesue;Takaaki Manaka;Setsuo Takaki
通讯作者：
Setsuo Takaki