High-temperature Oxidation Behavior of Barrel Materials
With the increase in firepower strike requirements and the development of high-poweredartillery,the high-temperature oxidation of barrel materials is becoming more and more serious,which seriously affects the performance of weapon and even leads to the scrapping of weapon. However,there is little research on the anti-oxidation performance of barrel materials at present. In this paper,the oxidation resistances and oxidation mechanisms of three barrel materials,i. e.,PCrNi3MoVA steel. 30SiMn2MoVA steel and MPS700 steel,at 600℃ in airare investigated. The cross-sectional morphology and phases of the oxide layers are analyzed by scanning electron microscopy,energy spectroscopy and X-ray diffractometry. The oxidation kinetics of three barrrel materials were analyzed. The results show that the oxide film thicknesses of the three steels gradually thicken and the rate of increaseinthickness gradually decreaseswith the increase in oxidation time. The oxidation kinetics curves of the three barrel materials are consistent with the parabolic growth kinetics law of oxide film. At 600℃,the internal oxide layer of PCrNi3MoVA steel forms an adhesive layer of a network structure consisting mainlyof Ni and Cr-richspinel oxides but theadhesive layerdoes not act as a barrier against oxidation. The inner layer of oxide layer of 30 SiMn2 MoVA steel is a porous aggregation zone of Si element oxide with a loose structure and relatively serious oxide flaking. The internal oxide layer of MPS700 steel forms a protective Cr-rich oxide layer that effectively prevents further oxidation. At the same time,Mo element stabilises the passivation film and indirectly improves oxidation resistance. Compared with PCrNi3MoVA steel and 30SiMn2MoVA steel,MPS700 steel can better form a dense oxidized layer under high temperature condition,so as to reduce the high temperature oxidation and wear degree of the matrix under high temperature conditions. MPS700 steel is more suitable for the preparation of long life and high reliability barrel.
barrel materialhigh-temperature oxidationoxide layeralloying element
万方数据
维普
