Experimental Research on the Factors Affecting Fusion Zone Size and Mechanical Properties in Crack Arrest by Current Detour and Joule Heating

[摘要] When pulsed current passes through the specimen containing a crack, since the cannot flow through the crack, the current has to detour around the crack tip, and the current density at the crack tip is excessively high. Owing to Joule heating, local melting occurs and a circle hole is formed at the crack tip. In this work, with 316 stainless steel as a specimen, the crack arrest experiment is performed on high pulsed current discharge device of type HCPD-I. The factors affecting the fusion zone size are studied. By making tensile test and fatigue test, relationships between the molten hole size and the crack arrest effect are derived. The experimental results indicate that the molten hole size is proportional to crack length and discharge parameter. The discharge parameter to the best effectiveness of crack arrest can be obtained.

[发布机构] Marine Engineering College, Dalian Maritime University, Dalian; 116026, China^1;Dalian Special Equipment Inspection Institute, Dalian; 116031, China^2

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] 316 stainless steel;Crack length;Discharge parameters;Experimental research;Fusion zone size;High pulsed current;Local melting;Pulsed currents