The mechanical behavior of a wear-resistant CrMoV-alloyed martensitic steel in quenched and tempered conditions has been investigated and correlated with the microstructure. The steel has a combination of ultra-high tensile strength of 2065 MPa and total elongation of 7.4 pct in the as-quenched condition. The strength and ductility of the steel change initially during tempering and thereafter remain quite stable during tempering at either 450 °C or 550 °C. A good combination of yield strength and total elongation is achieved after tempering at 550 °C for 2 to 8 hours (about 1300 MPa and 14 pct). The evolution of the mechanical properties can be mainly related to an initial condition with high density of dislocations (in the order of 10¹⁵) and carbon in solid solution, while quite early during tempering, dislocations will start to annihilate and carbide precipitates form. On the other hand, there is a negligible evolution of the effective grain size during tempering. Modeling of the individual strengthening mechanisms and the overall yield strength is in good agreement with the tensile test results, in particular for the tempered samples. Finally, the relatively low yield strength of the fresh martensite, significantly lower than for the tempered conditions, is discussed in relation to the two available theories.

已经研究了淬火和回火条件下的耐磨CrMoV合金马氏体钢的力学行为，并与显微组织相关。该钢在淬火条件下具有2065 MPa的超高抗拉强度和7.4 pct的总伸长率。钢的强度和延展性最初在回火期间发生变化，然后在450°C或550°C的回火过程中保持相当稳定。在550°C下回火2至8小时（约1300 MPa和14 pct）后，可以实现屈服强度和总伸长率的良好组合。机械性能的变化可能主要与位错密度高（约10 ¹⁵的初始条件）有关。）和固溶碳，尽管在回火的初期，位错将开始消失，形成碳化物沉淀。另一方面，回火过程中有效晶粒尺寸的变化可忽略不计。单个强化机制和总屈服强度的建模与拉伸测试结果非常吻合，尤其是对于回火样品。最后，结合两种可用的理论讨论了新鲜马氏体的相对较低的屈服强度，该强度明显低于回火条件。