高铬不锈钢堆焊合金的超细化显微组织及耐磨性

被引:8
作者
龚建勋 [1 ]
肖逸锋 [1 ]
张清辉 [1 ]
马蓦 [2 ]
机构
[1] 湘潭大学机械工程学院
[2] 湘潭大学材料与光电物理学院
关键词
不锈钢; 堆焊; 药芯焊丝; 超微细; 耐磨性;
D O I
暂无
中图分类号
TF764.1 [];
学科分类号
摘要
采用药芯焊丝埋弧堆焊方法制备含1.25%~1.75%C,15%~25%Cr,1.5%~1.8%V,2%~3%W和0.6%~1.0%B(质量分数)的高铬不锈钢合金,借助光学显微镜、扫描电镜和X射线衍射等分析手段,研究其显微组织、表面形貌及成分分布,考察碳化钨及碳含量对高铬堆焊合金硬度和耐磨性的影响。研究结果表明,高铬堆焊合金的显微组织由α-Fe+(Cr,Fe)23C6+(Cr,Fe)7C3+WC+TiB2等组成,其中,碳化钨颗粒从药芯焊丝过渡到堆焊合金前未完全熔化,阻碍晶粒长大,并使其粒度为5~10μm,因而,工件无预热且焊后不保温缓冷,堆焊合金没有开裂;耐磨粒磨损试验结果表明,高铬不锈钢堆焊合金的相对磨损系数为实芯焊丝H25Cr3Mo2MnV堆焊合金的5~18倍,耐磨性能好;弥散分布的碳化物颗粒强化α-Fe基体,使磨粒锲入受阻,耐磨性增强。
引用
收藏
页码:950 / 955
页数:6
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