模具鋼為什么會疲憊？如何推延模具鋼的疲憊？這相關問題應該是大部分使用者都會關注到的事情，下面冷作模具鋼廠家就來為您分析一番。

Why is die steel tired? How to prolong fatigue of die steel? This related problem should be something that most users will pay attention to. Now, the cold working die steel manufacturer will analyze it for you.

疲憊失效的特征，是在模具鋼的某些部位，經過必定的執役期，萌發了細微的裂紋，并逐步向縱深擴展，裂紋擴展到必定的尺度后，嚴重削弱模具鋼的承載才能而引起斷裂。

The feature of fatigue failure is that in some parts of the die steel, after a certain period of service, tiny cracks sprout and gradually extend to the depth. When the cracks extend to a certain scale, they seriously weaken the bearing capacity of the die steel and cause fracture.

疲憊裂紋萌發于應力較大的部位，特別是有應力會集的部位(尺度過渡、缺口、刀痕、磨削裂紋等)。

Fatigue cracks germinate in the parts with high stress, especially those with stress concentration (scale transition, notch, knife mark, grinding crack, etc.).

疲憊斷裂時，斷口可分為兩部分：一部分是疲憊裂紋開展形成的疲憊處破裂斷面，出現貝殼狀，疲憊源坐落貝殼極點;另一部分為突然斷裂，出現不平整的粗糙斷面。

When fatigue fracture occurs, the fracture can be divided into two parts: one part is the fracture section of the fatigue part formed by fatigue crack development, which appears as a shell, and the fatigue source is located at the shell pole; The other part is suddenly fractured with uneven rough section.

使模具鋼產生疲憊損害的底子原因是循環載荷。凡促使外表拉應力增大的因素，均加速疲憊裂紋的萌發。

The ultimate cause of fatigue damage of die steel is cyclic load. All factors that promote the increase of external tensile stress accelerate the germination of fatigue cracks.

冷作模具鋼在高硬度狀態下執役，此時，模具鋼鋼具有很高的屈從強度和很低的斷裂韌性。高的屈從強度有利于推延疲憊裂紋的萌發，但低的斷裂韌性使疲憊裂紋的擴展速率加速和臨界長度減小，使疲憊裂紋的擴展循環數大大縮短。因而冷作模具鋼，其疲憊壽數首要取決于疲憊裂紋萌發時刻。

Cold work die steel is in service under the condition of high hardness. At this time, the die steel has high yield strength and low fracture toughness. High yield strength is conducive to delaying the germination of fatigue cracks, but low fracture toughness accelerates the growth rate of fatigue cracks and reduces the critical length, which greatly shortens the number of fatigue crack growth cycles. Therefore, the fatigue life of cold working die steel mainly depends on the time of fatigue crack germination.

模具鋼疲憊的原因以及如何推遲這一問題就講解到這里了，您對此有什么需求就來我們網站http://m.6886774.cn進行咨詢吧！

The reason for the fatigue of die steel and how to delay the problem are explained here. If you have any needs, please come to our website http://m.6886774.cn Consult!