微合金化法对高锰铝青铜合金组织和性能的影响

Effect of Microalloying on Microstructure and Properties of High Manganese Aluminum Bronze Alloy

在保证高锰铝青铜耐腐蚀性能的前提下,为了提高高锰铝青铜的强度,在多元复杂铝青铜中添加0.3%Cr,促进了合金组织中K相的析出;添加0.3%Zr,使β相和γ2相混合区域面积增加约1/4,并且α相形貌由块状变为竹叶状;添加0.3%Nb,促进了α相的细化和生成,使α相增加了约1/13;添加0.3%Co,使得组织细化,并促进了α相和K相的产生,α相略微增加,K相增加了约2.4倍。Cr、Nb、Co的加入不同程度提高了合金的抗拉强度,Zr的加入对合金抗拉强度没有明显影响。添加0.3%Cr,获得了最高的抗拉强度,约为775 MPa,断后伸长率由24.8%降为18.2%。Cr、Zr、Nb、Co的加入对合金的均匀腐蚀速率有一定的影响,其中Cr、Zr、Co的添加使得合金耐腐蚀性能略有降低,Nb的添加使得合金耐腐蚀性能得到改善。其中添加0.3%Cr、0.3%Zr、0.3%Nb、0.3%Co的铝青铜和未微合金化的铝青铜的均匀腐蚀速率由大到小分别为含0.3%Zr合金、含0.3%Cr合金、含0.3%Co合金、未微合金化合金、含0.3%Nb合金,但在实验条件下,所有合金的耐蚀性都符合国家标准极耐腐蚀材料。

In order to improve the strength of high-manganese aluminum bronze under the premise of ensuring the corrosion resistance of high-manganese aluminum bronze,0.3%Cr is added to the complex aluminum bronze to promote the precipitation of K phase in the alloy structure;0.3%Zr is added,the area of mixed regions ofβphase andγ2 phase are increased by about 1/4,and the morphology ofαphase is changed from block to bamboo leaf;0.3%Nb is added to promote the refinement and generation ofαphase and the increase ofαphase is about 1/13;the addition of 0.3%Co refines the structure and promotes the production ofαphase and K phase.Theαphase increases slightly,while the K phase increases about 2.4 times.The additions of Cr,Nb,and Co improve the tensile strength of the alloy to varying degrees,and the addition of Zr has no obvious effect on the tensile strength of the alloy.With the addition of 0.3%Cr,the highest tensile strength is about 775 MPa,and the elongation after fracture is reduced from 24.8%to 18.2%.The additions of Cr,Zr,Nb,and Co have a certain effect on the uniform corrosion rate of the alloy.The additions of Cr,Zr,and Co slightly reduce the corrosion resistance of the alloy,and the addition of Nb improves the corrosion resistance of the alloy.Among them,the uniform corrosion rate of aluminum bronze with 0.3%Cr,0.3%Zr,0.3%Nb,and 0.3%Co and non-microalloyed aluminum bronze are 0.3%Zr alloy,containing 0.3%Cr alloy,containing 0.3%Co alloy,not microalloyed alloy,containing 0.3%Nb alloy,but under the experimental conditions,the corrosion resistance of all alloys meets national standards extremely corrosion-resistant material.