(1. 大连理工大学 材料科学与工程学院，大连 116024；
2. 中航工业西安飞行自动控制研究所，西安 710065；
3. 大连理工大学 机械工程学院，大连 116024)
摘 要: 研究退火态和冷轧态C67300锰黄铜合金在油润滑状态以及不同加载载荷和转速条件下，与对磨副GCr15钢的摩擦磨损性能，并借助一系列表征测试技术研究C67300锰黄铜的微观组织、力学性能(尤其硬弹比H/E)与摩擦性能的关联。结果表明：C67300锰黄铜主要由α-Cu(FCC结构)固溶体基体、β′-CuZn(B2结构)、和硬质颗粒ω-Mn5Si3 (D88结构)构成。冷轧态C67300锰黄铜的硬度(184 HV)和屈服强度(410 MPa)略高于其退火态的(137 HV，345 MPa)，从而导致合金的硬弹比(H/E)从0.014增大至0.020。在恒定载荷300 N、不同转速400~700 r/min条件下，冷轧态和退火态C67300锰黄铜的摩擦因数都随转速增加而降低，即摩擦因数f从0.06~0.07减小至0.02；而在恒定转速400 r/min、不同施加载荷200~500 N条件下，冷轧态和退火态合金摩擦因数都随施加载荷增加而增加，如冷轧态时摩擦因数从0.03增大至0.07。在不同试验条件下，冷轧态C67300锰黄铜的摩擦因数均低于退火态的，且变化幅度较小，表现出更佳的耐磨性，这主要是由于冷轧态C67300锰黄铜的H/E更接近于对磨副GCr15钢的H/E=0.035，从而有望通过提高合金的硬弹比，以实现与对磨副合金匹配来改善材料的耐磨性。
关键字: 锰黄铜合金；预变形；摩擦；磨损
（1. School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. The Aviation Industry Corporation of China, Xi’an Flight Automatic Control Institute, Xi’an 710065, China;
3. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024,China）
Abstract:The present work investigated primarily the friction and wear properties of annealed and cold-rolled C67300 manganese brass against the GCr15 steel (friction pair) under the conditions of different loads and speeds, as well as the oil lubrication. The microstructures, mechanical properties, and friction properties of annealed and cold-rolled C67300 manganese brass were characterized by a series of testing techniques. Experimental results show that the C67300 manganese brass is constituted of α-Cu solid solution matrix with a face-centered-cubic (FCC) structure, plus β′-CuZn with a B2 structure and ω-Mn5Si3 with a D88 structure. The microhardness (184 HV) and yield strength (410 MPa) of cold-rolled C67300 manganese brass are slightly higher than those of annealed alloy (137 HV and 345 MPa), which results in a ratio of microhardness to Young’s modulus of the cold-rolled alloy (H/E=0.02) much higher than that of the annealed (H/E=0.014). The friction coefficients of both annealed and cold-rolled C67300 manganese brass decrease, with the increase of speed from 400 r/min to 700 r/min when fixing the applied load of 300 N, from f=0.06-0.07 to f=0.02. By contrast, the friction coefficients of both annealed and cold-rolled C67300 manganese brass increase with the applied load from 200 N to 500 N when fixing the speed of 400 r/min, as exampled by the fact that the friction coefficient of cold-rolled alloy increases f=0.03 to f=0.07. It is found that a relatively lower friction coefficient always appears in the cold-rolled alloy under any applied conditions, indicating that the cold-rolled C67300 manganese brass possesses a better wear resistance than the annealed. It is mainly ascribed to the fact that the H/E value (H/E=0.02) of cold-rolled C67300 manganese brass is much close to that of the friction pair of GCr15 steel (H/E=0.035), which is expected to improve the wear resistance of alloys by matching the H/E values of friction pairs well.
Key words: C67300 manganese brass; pre-deformation; friction; wear
