利用摩擦磨损试验机和自由磨料式腐蚀磨损试验机,在不同的润滑、载荷和腐蚀条件下,对两种组织类型不同、但抗拉强度同为700 MPa级别的S700和M700低合金高强度钢的滑动耐磨性和腐蚀耐磨性进行了研究,并分析了磨损机理。结果表明：S700钢的组织为铁素体＋贝氏体,M700钢的组织为铁素体＋珠光体；S700钢的硬度略高于 M700钢的；在相同的滑动磨损条件下,S700钢的磨损量小于M700钢的；试验钢在酸性溶液中的腐蚀耐磨性均较差；在相同的腐蚀磨损条件下,S700钢的腐蚀耐磨性优于 M700钢的；两种试验钢的滑动磨损机制主要是微观切削和塑性变形,酸性条件下的腐蚀磨损形貌为大面积的腐蚀坑且伴随剥落,而碱性条件的则以微观切削为主,并伴有少许的剥落。
Using the friction and wear testing machine and free abrasive wear testing machine,the wear resistance and wear mechanism of the low alloy high strength steels S700 and M700 with two different microstructures but same tensile strength level of 700 MPa were studied under different lubrication,loading and corrosion conditions;their wear mechanism were analyzed.The results show that the microstructure of S700 steel is ferrite and bainite,and the microstructure of M700 steel is ferrite and pearlite,and the hardness of S700 steel is slightly higher than that of M700 steel.Under the same sliding wear condition,the wear mass of S700 steel is less than that of M700 steel.The wear resistance of test steels under acidic condition is poor.Under the same corrosion wear conditions,the corrosion resistance of S700 steel is better than that of M700 steel.The sliding wear surface morphology of the steels is mainly micro cutting mechanism and plastic deformation mechanism;their corrosion wear morphology in acidic solution appears large area of corrosion pits and accompanied by spalling,and the morphology in alkaline solution is micro cutting,accompanied by a little peeling.
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