用金相显微镜,X 射线衍射(XRD),扫描电镜(SEM),透射电镜(TEM)和 X 射线能谱(EDS)对等离子弧堆焊Co-Cr-W 系多元合金层进行了研究,结果表明,合金层基体为具有(200)晶面择优取向的 Co 基固溶体,Co 基固溶体中存在许多堆垛层错;与固溶体组...用金相显微镜,X 射线衍射(XRD),扫描电镜(SEM),透射电镜(TEM)和 X 射线能谱(EDS)对等离子弧堆焊Co-Cr-W 系多元合金层进行了研究,结果表明,合金层基体为具有(200)晶面择优取向的 Co 基固溶体,Co 基固溶体中存在许多堆垛层错;与固溶体组成共晶体的碳化物主要为具有六方点阵并含有层片状孪晶的(Cr, Fe)7C3。展开更多
Heavy duty engine valve head was prepared by Ni76Cr19AlTi alloy.It was coated by cobalt-base alloy on the surface topromote its wear-resistance.Hardness tester,metallograph,scanning microscopy,energy spectrum and X-ra...Heavy duty engine valve head was prepared by Ni76Cr19AlTi alloy.It was coated by cobalt-base alloy on the surface topromote its wear-resistance.Hardness tester,metallograph,scanning microscopy,energy spectrum and X-ray diffraction were used toanalyze the mechanical properties,the microstructure of the welds and the coated layer of cobalt-base alloy.The results show that thegrains are obviously coasened in the side of Ni76Cr19AlTi alloy in the welds and it contains a typical dentritic structure in the sidecobalt-base alloy.It is found that micro-strain in weld is stronger than that in heat-effected-zone.Micro-strain in nickel-base alloy isstronger than that cobalt-base alloy.There are not obvious imperfects in the weld.Hardness in cobalt-base alloy is more than 390HVand the major carbides in cobalt-base alloy are Cr7C3 and W2C.展开更多
文摘用金相显微镜,X 射线衍射(XRD),扫描电镜(SEM),透射电镜(TEM)和 X 射线能谱(EDS)对等离子弧堆焊Co-Cr-W 系多元合金层进行了研究,结果表明,合金层基体为具有(200)晶面择优取向的 Co 基固溶体,Co 基固溶体中存在许多堆垛层错;与固溶体组成共晶体的碳化物主要为具有六方点阵并含有层片状孪晶的(Cr, Fe)7C3。
文摘Heavy duty engine valve head was prepared by Ni76Cr19AlTi alloy.It was coated by cobalt-base alloy on the surface topromote its wear-resistance.Hardness tester,metallograph,scanning microscopy,energy spectrum and X-ray diffraction were used toanalyze the mechanical properties,the microstructure of the welds and the coated layer of cobalt-base alloy.The results show that thegrains are obviously coasened in the side of Ni76Cr19AlTi alloy in the welds and it contains a typical dentritic structure in the sidecobalt-base alloy.It is found that micro-strain in weld is stronger than that in heat-effected-zone.Micro-strain in nickel-base alloy isstronger than that cobalt-base alloy.There are not obvious imperfects in the weld.Hardness in cobalt-base alloy is more than 390HVand the major carbides in cobalt-base alloy are Cr7C3 and W2C.
