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为了揭示先激光离散淬火基体后再镀铬复合工艺提高镀铬身管寿命的机理,利用YAG激光器对某型号武器身管内表面进行螺旋式离散淬火预处理,形成沿基体界面周期性变化的强/韧相结合的镀铬层/基体结构,并对该结构的镀铬身管进行靶场实弹射击试验,对强化和韧性区上的铬层都开裂部分进行了解剖分析,并利用非均匀材料中的屈服强度梯度对裂纹驱动力影响理论,对进入强化区的界面裂纹驱动力进行了研究。结果表明,只有韧性区出现界面裂纹;该结构将均匀基体的随机界面损伤问题转变为可控的界面损伤,降低了界面损伤量;强化区沿基体界面存在的屈服强度梯度,是强化区能够减小界面裂纹驱动力、延缓界面损伤速度的因素之一。
In order to reveal the mechanism of laser quenching matrix and then chrome plating composite process to improve the life of chrome plated barrel, YAG laser was used to pretreated the inner surface of a certain type of weapon barrel by spiral discrete quenching to form the strong / Combined with the chrome layer / matrix structure, and the firing of the structure of the chrome tube shooting range live tests were conducted on the strengthening and toughness of the chrome layer are cracked part anatomical analysis and use of non-uniform material yield strength gradient pair The theory of crack driving force influence the driving force of interface crack entering the strengthened zone. The results show that only the interface cracks appear in the ductile zone. This structure transforms the random interface damage problem of uniform matrix into controllable interface damage and reduces the amount of interface damage. The yield strength gradient exists along the interface of matrix in strengthening zone, Small interface crack driving force, one of the factors that slow the interface damage speed.