Small Punch Deformation and Fracture Behavior of Weld-Overlay
Weld-overlay cladding has been widely used in quite different industrial fields as a technique for improving the surface performance of structural materials.But, its strength depends on the type of weld metal and the welding condition used in the process, and the controlling factor of strength has not yet been clarified under the circumstances.In addition, it has been reported that the strength reduction of local area is caused by the microstructural changes due to the heat input during welding.In the present study, a small punch (SP) testing technique and a digital image correlation method were applied to identify the influence of the sampling direction and position of specimen on the strength, deformation and fracture behaviour of Ni alloy weld metal.Experimental results revealed that the weld metal had a specific distribution of the local strength that varies by the sampling position of specimen.Furthermore, the deformation and fracture occurred preferentially near the grain and/or dendrite boundaries, and such inhomogeneous defomation and fracture seemed to be responsible for the ductility reduction in the SP test.
Small punch test Miniaturized specimen Digital image correlation Weld-overlay cladding Yield strength Tensile strength Ductility Nickel base alloy
Ryuichiro Jojima Shin-ichi Komazaki Takaaki Matsuoka Keiji Kubushiro Daisuke Abe
Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan IHI Corporation, 1, Shinnakahara-cho, Isogo-ku, Yokohama 235-8501, Japan,
国际会议
长沙
英文
44-48
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）