Alloy powders including Ni60, WC, CrC, and TiC with different mass ratios were deposited on medium carbon low alloy steel by plasma welding. Through the experiments, the optimal alloy powder reinforcing cutter tool su...Alloy powders including Ni60, WC, CrC, and TiC with different mass ratios were deposited on medium carbon low alloy steel by plasma welding. Through the experiments, the optimal alloy powder reinforcing cutter tool surface properties were discovered. The wear resistance properties were investigated on the impact abrasive wear tester. The experimental results show that in terms of microstructure, there exists the shape of herringbone, spider mesh, broken flower structures in coatings. In addition, fusion area of four specimens surfacing welding layer displays a large number of acicular martensite with a small amount of austenite. The coating mainly consists of Ni-Cr-Fe austenitic phase and the other precipitates. TiC density is smaller, its content is less in alloy powder, in the process of surfacing welding, TiC is melted fully, which is mainly distributed in surface layer and middle layer of hard facing layer. The content of TiC gradually reduces from surface layer of hard facing layer to the fusion area. Compared to TiC, the density of tungsten carbide and chromium carbide is larger, there exist tungsten carbide and chromium carbide particles, which are not completely melted near the fusion area. The micro-hardness presents gradient change from the fusion area to the surface layer of hard facing layer, and the hardness of the middle layer is slightly lower than that of the fusion area, and the hardness increases near the surface layer.展开更多
为了研究焊接热输入对高硼铁基堆焊合金组织结构及力学性能的影响,利用CO2/MAG焊,采用FeCr-C-B系金属粉芯焊丝制备高硼铁基堆焊合金,利用力学试验机、硬度仪、光学显微镜、扫描电镜及X射线衍射仪等研究了堆焊合金的组织形貌、力学性能...为了研究焊接热输入对高硼铁基堆焊合金组织结构及力学性能的影响,利用CO2/MAG焊,采用FeCr-C-B系金属粉芯焊丝制备高硼铁基堆焊合金,利用力学试验机、硬度仪、光学显微镜、扫描电镜及X射线衍射仪等研究了堆焊合金的组织形貌、力学性能及析出相的变化。结果表明:高硼铁基堆焊合金由(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)相组成,随着热输入的增加,初晶(Fe,Cr)和(Fe,Cr)2B体积分数增加,(Fe,Cr)3(C,B)相减少,堆焊合金的冲击韧性增加,当热输入为220.8 k J/m时冲击功达到最大298 J;堆焊合金的宏观硬度取决于(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)的体积分数,当热输入为220.8 k J/m时获得堆焊合金的最小洛氏硬度59 HRC。展开更多
基金Funded by the National Science and Technology Support Project(2006BAK02B01-02)
文摘Alloy powders including Ni60, WC, CrC, and TiC with different mass ratios were deposited on medium carbon low alloy steel by plasma welding. Through the experiments, the optimal alloy powder reinforcing cutter tool surface properties were discovered. The wear resistance properties were investigated on the impact abrasive wear tester. The experimental results show that in terms of microstructure, there exists the shape of herringbone, spider mesh, broken flower structures in coatings. In addition, fusion area of four specimens surfacing welding layer displays a large number of acicular martensite with a small amount of austenite. The coating mainly consists of Ni-Cr-Fe austenitic phase and the other precipitates. TiC density is smaller, its content is less in alloy powder, in the process of surfacing welding, TiC is melted fully, which is mainly distributed in surface layer and middle layer of hard facing layer. The content of TiC gradually reduces from surface layer of hard facing layer to the fusion area. Compared to TiC, the density of tungsten carbide and chromium carbide is larger, there exist tungsten carbide and chromium carbide particles, which are not completely melted near the fusion area. The micro-hardness presents gradient change from the fusion area to the surface layer of hard facing layer, and the hardness of the middle layer is slightly lower than that of the fusion area, and the hardness increases near the surface layer.
文摘为了研究焊接热输入对高硼铁基堆焊合金组织结构及力学性能的影响,利用CO2/MAG焊,采用FeCr-C-B系金属粉芯焊丝制备高硼铁基堆焊合金,利用力学试验机、硬度仪、光学显微镜、扫描电镜及X射线衍射仪等研究了堆焊合金的组织形貌、力学性能及析出相的变化。结果表明:高硼铁基堆焊合金由(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)相组成,随着热输入的增加,初晶(Fe,Cr)和(Fe,Cr)2B体积分数增加,(Fe,Cr)3(C,B)相减少,堆焊合金的冲击韧性增加,当热输入为220.8 k J/m时冲击功达到最大298 J;堆焊合金的宏观硬度取决于(Fe,Cr)、(Fe,Cr)2B和(Fe,Cr)3(C,B)的体积分数,当热输入为220.8 k J/m时获得堆焊合金的最小洛氏硬度59 HRC。
