共查询到19条相似文献,搜索用时 181 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
在Fe-Cr-C系高Cr铸铁型堆焊焊丝中加入Mo元素制成自保护药芯焊丝,通过热力学平衡计算,理论分析了Mo对高碳高铬系堆焊材料的强化机理。结果表明:Mo元素的添加,可以增加堆焊层中初生碳化物的数量,细化合金组织,在强化碳化物的同时强化基体。通过试验的方法对比分析了Mo元素对高Cr铸铁型堆焊材料显微组织和力学性能的影响,当加入2%Mo时,堆焊熔覆层的质量明显好于不含Mo的材料,同时堆焊层平均硬度值提高了12.5%,添加Mo元素焊丝堆焊制备的复合材料的常温冲击韧性是未添加Mo元素的1.9倍。 相似文献
9.
采用焊条电弧焊堆焊技术,在Q235钢表面堆焊铁基、铁基和镍基复合粉末.研究添加自熔性合金粉末后堆焊层的性能状况.利用金相显微镜对堆焊层的金相组织进行了研究,通过硬度和磨损试验测试了堆焊层表面的硬度和耐磨性.结果表明,添加铁基自熔性合金或铁镍混合自熔性合金粉末均提高了堆焊层的硬度,并且随着添加量的增加,硬度和耐磨性也有相应的提高,且铁基和镍基复合自熔性粉末比铁基自熔性合金粉末强化效果好. 相似文献
10.
11.
12.
13.
14.
15.
M. Balakrishnan V. Balasubramanian G. Madhusudhan Reddy 《Journal of Materials Engineering and Performance》2013,22(3):806-814
Ballistic performance of armor steel welds is very poor due to the usage of low strength and low hardness austenitic stainless steel fillers, which are traditionally used to avoid hydrogen induced cracking. In the present investigation, an attempt has been made to study the effect of plasma transferred arc hardfaced interlayer thickness on ballistic performance of shielded metal arc welded armor steel weldments. The usefulness of austenitic stainless steel buttering layer on the armor grade quenched and tempered steel base metal was also considered in this study. Joints were fabricated using three different thickness (4, 5.5, and 7 mm) hardfaced middle layer by plasma transferred arc hardfacing process between the top and bottom layers of austenitic stainless steel using shielded metal arc welding process. Sandwiched joint, in addition with the buttering layer served the dual purpose of weld integrity and ballistic immunity due to the high hardness of hardfacing alloy and the energy absorbing capacity of soft backing weld deposits. This paper will provide some insight into the usefulness of austenitic stainless steel buttering layer on the weld integrity and plasma transferred arc hardfacing layer on ballistic performance enhancement of armor steel welds. 相似文献
16.
通过在Q235钢表面渗入钨、钼、钇和碳的表面合金化,并进行淬火和回火以强化表面合金层的性能。利用M200滑动磨损实验机进行滑动磨损性能研究进行对比。结果表明:钇的加入可以促进渗层形成足够多的碳化物核心,为碳化物弥散析出创造良好的条件。表面钨钼稀土合金层、表面钨钼合金层、T10钢、M2高速钢(均进行了淬火+回火的强化处理,下称强化处理)的平均摩擦系数分别为:0.30、0.47、0.57、0.31;表面稀土合金层经强化处理后耐磨性能最好;在干滑动磨损条件下,表面稀土合金强化层的滑动磨损失效形式主要是粘着磨损;加入钇后,试样的摩擦系数降低,显示出优异的耐磨性及良好的减摩性能。 相似文献
17.
18.
19.
The nitrogen-alloying hardfacing alloy of the martensitic stainless steel was deposited on a low carbon steel substrate using hardfacing flux-cored wire. Microstructure and surface hardness of hardfacing alloy were investigated and measured by optical microscope and microhardness tester. Carbonitrides of the hardfacing alloy were observed by electron probe. The wear behaviour of the hardfacing alloy was studied using the belt abrasion test apparatus and the worn surface was analyzed by scanning electron microscopy. The results showed that carbonitride particles in the hardfacing alloy are complex MX (M:alloy elements; X:C, N) precipitate with fine size. These carbonitride particles distributed homogeneously in the hardfacing alloy and had a good strengthening effect on the wear property. The wear property of the hardfacing alloy with nitrogen was better than the one without nitrogen. 相似文献