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HPb59-1铅黄铜被认为是具有极好热锻性能的材料,但实际上存在着由于晶粒粗化而引起锻裂的严重质量问题。作者通过对HPb59-1热挤圆棒的质量调查和分析,发现该材料存在着本质细晶粒和本质粗晶粒两种类型。具有本质细晶粒的HPb59-1铅黄铜能在β相区(780℃)极好地承受热锻;具有本质粗晶粒的HPb59-1铅黄铜则在热挤终了和热锻时发生晶粒再结晶长大而导致开裂。作者通过对两类材料的实际化学成分和金相组织分析,讨论了铜含量对热锻性能的影响;探讨了铅和杂质元素对合金晶粒粗化的影响。提出了添加微量合金元素以抑制晶粒再结晶长大的解决途径。
HPb59-1 lead brass is considered to be a material with excellent hot forging properties, but in fact there is a serious quality problem of forging due to grain coarsening. The author of HPb59-1 hot-extruded round bar quality survey and analysis found that the material exists in essence fine grain and coarse grain two types. HPb59-1 lead brass with intrinsically fine grains is excellently hot-forged in the β-phase region (780 ° C); HPb59-1 lead brass with intrinsic coarse grains occurs during hot-extrusion and hot forging Grain recrystallization grow up and lead to cracking. By analyzing the actual chemical composition and microstructure of the two types of materials, the author discussed the effect of copper content on the hot forging performance and the effect of lead and impurity elements on the grain coarsening of the alloy. A solution to the problem of adding trace alloying elements to restrain recrystallization and grain growth was proposed.