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首页> 外文期刊>Journal of Materials Engineering and Performance >Through-Thickness Cleavage Fracture Stress of a Ti-V-N Plate Steel
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Through-Thickness Cleavage Fracture Stress of a Ti-V-N Plate Steel

机译：Ti-V-N板钢的全厚度解理断裂应力

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摘要

Through-thickness cleavage fracture stresses, #sigma#_f* have been determined for six microstructures of a Ti-V-N plate steel directly by through-thickness four-point bending (4PB) notched specimens. Results showed that #sigma#_f* is higher for ferrite-bainite microstructures than for ferrite-banded pearlite. For an identical finish-rolling temperature (FRT), the plates with a high cooling rate have a higher value of #sigma#_f* than their counterparts with a low cooling rate. Following the same cooling rate, the highest values of #sigma#_f* are obtained for steels finish rolled above A_(r3) but below T_(NR) (nonrecrystallization) and the lowest for steels finish rolled below A_(r3), which contain deformed ferrite (DF) with texture components. Cleavage microcracks are observed to initiate at second-phase particle or pearlite-ferrite interface and then to propagate into ferrite matrix. Growing microcracks could be arrested by bainite phase distributed uniformly in ferrite matrix, which contributes to a high value of #sigma#_f*. The low value of #sigma#_f* was attributed to elongated ferrite-deformed ferrite and martensite/austenite (MA) microstructures.
机译：直接通过厚度四点弯曲（4PB）缺口试样确定了Ti-V-N板钢的六个显微组织的厚度全解理断裂应力，＃sigma＃_f *。结果表明，铁素体-贝氏体显微组织的＃sigma＃_f *高于带铁素体的珠光体。对于相同的终轧温度（FRT），具有较高冷却速率的板具有比具有较低冷却速率的板更高的＃sigma＃_f *值。在相同的冷却速度下，对于在A_（r3）以上但在T_（NR）以下（非再结晶）的精轧钢，获得＃sigma＃_f *的最大值，而在A_（r3）以下的精轧钢的最小值为＃sigma＃_f *。具有纹理成分的变形铁素体（DF）。观察到裂解微裂纹在第二相颗粒或珠光体-铁素体界面处开始，然后传播到铁素体基体中。不断增长的微裂纹可以被贝氏体相均匀地阻止在铁素体基体中，从而导致＃sigma＃_f *的高值。 ＃sigma＃_f *的低值归因于拉长的铁素体变形铁素体和马氏体/奥氏体（MA）显微组织。

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