论文部分内容阅读
测定了１０Ｎｉ３ＭｎＣｕＡｌ马氏体沉淀硬化型塑料模具用钢在固溶淬火态及不同时间时效后的动态断裂韧度Ｋ＿（１ｄ）。组织为板条状低碳马氏体且条间分布有少量残余奥氏体的固溶态钢，Ｋ＿（１ｄ）值明显高于时效后的Ｋ＿（１ｄ）值，这是由于时效过程中脱溶析出细小弥散的Ａｌ＿３Ｎｉ型沉淀相并对基体产生强烈的应力场所致。试验还表明，此钢的Ｋ＿（１ｄ）冲击速度很敏感，不论是固溶态或时效态，Ｋ＿（１ｄ）都随冲击速度的提高而下降，应用位错动力学理论可对此现象作出解释。
The dynamic fracture toughness K_ (1d) of 10Ni3MnCuAl martensitic precipitation hardening plastic mold steel after solution aging and different time aging were measured. The value of K 1d was significantly higher than that of K 1d after aging, which was due to the lamellar low carbon martensite and a small amount of residual austenite distributed between the strips. Dissolved fine dispersed Al_3Ni-type precipitated phase and the substrate caused by a strong stress field. The experiment also shows that the K 1d impact velocity of the steel is very sensitive, and the K 1d decreases with the increase of the impact velocity in both the solution state and the aging state. The dislocation kinetics theory can explain this phenomenon .