Co-Ni超高强度钢的疲劳裂纹扩展行为与组织的关系

Relationship Between Fatigue Crack Growth Behaviour and Microstructures in Co-Ni Ultra high Strength Steel

研究了 2 3NiCo钢应力比R =0 .1的疲劳裂纹扩展行为与组织的关系。 2 3NiCo钢比同一强度级钢具有较低的裂纹扩展速率的原因主要与钢的微观组织特征有关。 2 3NiCo钢在

The relationship between fatigue crack growth behaviour and microstructures of 23NiCo steel was studied at the stress ratio R =0.1. 23NiCo steel showed slower fatigue crack growth rate than other steels with the same strength level,it is related to the characteristic of microstructures of 23NiCo steel.The absence of cementite and formation of reverted austenite at the plate boundaries tempered at 482℃ are the main factors.