BULLETIN 358-1990由WRC - Welding Research Council 发布于 1990-11-01,并于 2012-10-12 实施。
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An experimental and analytical study of square three-point bend specimens was conducted to investigate the elastic-plastic fracture toughness of a high-strength low-strain hardening steel using shallow and deep crack test specimens. Changes in CTOD level with varying crack depth to width ratios of CTOD specimens were investigated for this material and compared to other results to determine how material properties@ such as the strength level and strain hardening@ affect the CTOD level for varying a/W ratios. Publication of this report - WRC Bulletin No. 358 was sponsored by the Pressure Vessel Research Council of the Welding Research Council and the American Iron and Steel Institute.
研究发现该钢具有非常高的强度和韧性,这主要得益于本文提出的高屈服强度诱发晶界分层开裂增韧新机制,这种机制有利于超高强钢铁材料断裂韧性的大幅提升。打破了传统认为的提高强度会降低材料断裂韧性的常识。锰元素在原奥氏体晶粒边界富集,也保留在组织结构中。D&P钢超高的屈服强度诱发锰元素富集的原奥氏体晶界在垂直于主裂纹面的方向上启动分层裂纹。...
D&P钢超高的屈服强度诱发锰元素富集的原奥氏体晶界在垂直于主裂纹面的方向上启动分层裂纹。原奥氏体晶界分层开裂之后,使原本的平面应变断裂转变成一系列沿样品厚度方向的平面应力断裂过程,极大地提高了D&P钢的断裂韧性。另外,高强高韧D&P钢的相变诱导塑性(TRIP toughening)也进一步提高了该材料的断裂韧性。...
共晶鱼骨状结构高熵合金的多级裂纹缓冲效应及其辅助的超高强韧性如果外力载荷不能被弹塑性的协调运动吸收,材料内部的将会出现裂纹知道失效。但是在自然界仿生材料中,具有梯度结构的材料往往表现出非常好的韧性,使得其广泛被应用。但是,具有良好韧性的材料往往塑性较差。本工作利用定向凝固方法制备一种共晶高熵合金(EHEA),成功地协调了裂纹容限和高延伸率之间的矛盾。...
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