论文部分内容阅读
用半椭圆表面裂纹试样单轴拉伸研究了塑性变形诱发Cr-Mo-V铁基内生复合板的力学行为。结果表明这种内生复合板在超高强度水平上对表面裂纹不敏感。屈服强度高于1500Mpa,裂纹相对面积达14％时,最大名义应力高于0.9σ_(0.2),断口、微观结构和透射电镜下的原位拉伸的观察分析表明,这种内生复合板的微观结构是由平行于轧面排列的加工硬化了的马氏体板条及弱化了的板条间界面构成,这种弱界面可缓解主裂纹前沿的应力,应变集中而使其强度潜力得到充分发挥。
The mechanical behavior of Cr-Mo-V Fe-based composite plate induced by plastic deformation was studied by uniaxial tensile testing of semi-elliptical surface cracked specimens. The results show that this endoprosthesis is not sensitive to surface cracking at very high levels of strength. When the yield strength is higher than 1500Mpa and the relative area of cracks is 14%, the maximum nominal stress is higher than 0.9σ_ (0.2). Observation and analysis of the in-situ tensile under fracture, microstructure and TEM shows that The microstructure is composed of work-hardened martensite laths arranged parallel to the nip and weakened interlaminar slab interfaces, which weaken the stresses and strains at the leading edge of the main cracks to a sufficient extent to their strength potential Play