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one, and the impact toughness scattering was mainly caused by the scattering in the cleavage fracture stress σf. The value of σf is related to the size of the microcrack formed in the bainitic packet. When a bainitic packet-sized microcrack propagates from one bainitic packet into the adjacent packet, cleavage fracture occurs. The cleavage fracture is controlled by the few coarse packets......
钢解理断裂应力的测量和物理意义 王俊刚1,陈剑虹1,王国珍1 (1.甘肃工业大学材料科学与工程学院,兰州,730050) 摘要:用二维平面应变有限元计算了不同尺寸四点弯曲(4PB)缺口试样缺口前的应力分布.通过测量解理起裂源的位置,精确测定了一种钢的细观解理断裂应力σf和宏观解理断裂应力σF.结果表明,σF的测量比σf更简单和方便,σf的值可以用σF估计.随试样尺寸的增加,σF和σf的值基本不变,σf的分散性小于σf.稳定的σF和σf的下限值可以用比Griffith-Owen试样尺寸大的试样测得.σf可精确用于细观解理断裂机理的分析,并表征了钢的本质韧性.建议σF作为一个潜在的工程参数,......
but the elongation of as-cast T5 is higher than as-cast T6. The fracture mode of as-cast T6 is intergranular and transgranular cleavage fracture, but as-cast T5 is mainly microvoid coalescence fracture combination the brittle cleavage fracture.关键词:......
results reveal that it mainly ruptures along the ionic Ce-O and Ce-F bonds during the cleavage of bastnaesite,leaving≡Ce+,≡F-and≡CO3-dangling bonds exposed on the cleavage surface of bastnaesite.Combined... of exposed strong ionic bond on cleavage surface results in hydrophilic surface.According to surface complexation theory,the formed surface groups are≡CeOH0,≡CO3 H0 and≡FH0 groups.The investigated metal......
results reveal that it mainly ruptures along the ionic Ce-O and Ce-F bonds during the cleavage of bastnaesite,leaving≡Ce+,≡F-and≡CO3-dangling bonds exposed on the cleavage surface of bastnaesite.Combined... of exposed strong ionic bond on cleavage surface results in hydrophilic surface.According to surface complexation theory,the formed surface groups are≡CeOH0,≡CO3 H0 and≡FH0 groups.The investigated metal......
distortion.The observation of crack in nano scale that dearly forms angles of 60° and 90° with respect to the lamellar phase,indicates that the probable cleavage planes are crystal faces(1011) and(1010).The results of investigation can deepen the understanding of mechanical anisotropy and cleavage fracture in the SmCo magnets.关键词:......
distortion.The observation of crack in nano scale that dearly forms angles of 60° and 90° with respect to the lamellar phase,indicates that the probable cleavage planes are crystal faces(1011) and(1010).The results of investigation can deepen the understanding of mechanical anisotropy and cleavage fracture in the SmCo magnets.关键词:......
} and {001} cleavage surfaces and {112} crystal surface are the commonly exposed surfaces, which are consistent with both previous literatures and the present experimental observations based on the XRD. Cleavage generates more easily along {112} surfaces than along {001} surfaces due to their different interlayer spacings. The surface roughness and appearance of different predominantly exposed surfaces......
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as-cast T6. The fracture mode of as-cast T6 is intergranular and transgranular cleavage fracture, but as-cast T5 is mainly microvoid coalescence fracture combination the brittle cleavage fracture......