Mn元素对CuZnNi钎料润湿性及钎焊接头组织和性能的影响%Effect of Mn element on the wettability of CuZnNi brazing filler metal and the microstructure and properties of brazed joints
新乡市七星钎焊科技有限公司 河南新乡 453003 河南省科学院材料研究所 河南郑州 450046 中国机械总院集团宁波智能机床研究院有限公司 浙江宁波 315700 上海第二工业大学智能制造与控制工程学院 上海 201209 格力电器(郑州)有限公司 河南郑州 450007 哈尔滨工业大学材料结构精密焊接与连接全国重点实验室 黑龙江哈尔滨 150001 江苏科技大学材料科学与工程学院 江苏镇江 212003
2026-03-05
Mn元素 CuZnNiMn钎料 润湿铺展 微观组织 抗拉强度
将不同含量的Mn元素加入CuZnNi钎料中,研究CuZnNiMn钎料的熔点、润湿性和微观组织构成.通过感应钎焊工艺,采用CuZnNiMn钎料实现了YG8硬质合金与Q235钢的连接.研究不同Mn含量对感应钎焊接头微观组织构成及抗拉强度的影响.结果表明:当Mn含量由0%增至6%(质量分数)时,CuZnNiMn钎料的液相线温度从1014.45℃降低至915.88℃,钎料润湿性提高,其在钢表面的润湿铺展面积从210mm2增加至310mm2.CuZnNiMn钎料的显微组织主要由灰白色的α-Cu与深灰色的β(β')型Cu-Zn两相固溶体构成.随着Mn含量的增加,两相的比例与形貌发生显著改变.当Mn含量增至6%时,组织中出现了明显的成分偏析.采用该钎料感应钎焊YG8硬质合金与Q235钢,所得接头的典型组织包括:靠近硬质合金侧的界面扩散层(主要为Co-Cu-Ni固溶体)、钎缝中心的α-Cu固溶体及富Zn的Cu-Zn固溶体.随着钎料中Mn含量的增加,钎焊接头的抗拉强度呈现先升高后降低的趋势,当Mn含量为4%时,接头的抗拉强度达到峰值325MPa.%Element Mn with different contents were added into CuZnNi brazing filler metals,and the melting point,wettability and microstructure composition of CuZnNiMn brazing filler metals were studied.Subsequently,the CuZnNiMn brazing filler metal was used to induction braze YG8 hard alloy and Q235 steel and the effect of different Mn contents on the microstructure composition and tensile strength of the brazed joint were discussed.The results showed that with the increase of Mn content(wt.)from 0%to 6%,the liquid phase lines of CuZnNiMn brazing filler metal decreased from 1014.45℃ to 915.88℃,so that the wettability of the brazing filler metal improved.The wetting and spreading area of CuZnNiMn brazing filler metal on the steel surface increased from 210mm2 to 310mm2.The microstructure of CuZnNiMn brazing filler metal was mainly composed of gray-whiteα-Cu solid solution and dark gray β(β')Cu-Zn solid solution.The increase of Mn content in the solder changed the proportion and morphology of the two phases in the structure.When the Mn content increased to 6%,the two kinds of phase generated segregation.The induction brazed joint between YG8 hard alloy and Q235 steel was mainly composed of Co-Cu-Ni solid solution in the interface of brazing seam and YG8 hard alloy,also α-Cu solid solution and Cu-Zn alloy in the brazing seam center.With the increase of Mn content in the solder,the tensile strength of the brazed joint increased first and then decreased with the Mn content increasing.When the Mn content was 4%,the tensile strength of the brazed joint reached the maximum value of 325MPa.
