دانلود رایگان مقاله لاتین شکست ارتباط فولاد ضد زنگ از سایت الزویر
عنوان فارسی مقاله:
تجزیه و تحلیل شکستگی شکست ارتباط فولاد ضد زنگ 4Cr13 در قطع کننده مدار
عنوان انگلیسی مقاله:
Fracture failure analysis of 4Cr13 stainless steel linkages in circuit breakers
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
4Cr13, a martensite stainless steel, has a high hardenability, good polishing properties, excellent resistance to corrosion and hot oxidation [1]. Due to these excellent properties, 4Cr13 stainless steel can be applied in several important fields, such as precision mechanism, structural automotive application, and petrochemical industry. During manufacturing process, the heat treatment has significant effect on the mechanical properties of 4Cr13 components. The strength and hardness of 4Cr13 components could remarkably increase after quenching and tempering. However, cracks are induced, finally resulting in the fracture failure of the components under overloading condition. Ouyang et al. [2] suggested that 4Cr13 stainless steel was quenched by a CO2 laser and tempered for 2 h at different temperatures in the range 200 8C to 550 8C, it was found that the transition of wear mechanism was from mild oxidational wear to severe adhesive wear with the increase of normal load or sliding speed. In this study, some single-phase circuit breakers (voltage 220 V, frequency 50 Hz) did not normally work during installation processing in one workshop. The 1.45In ampere-second characteristic test was disconnected. The schematic diagram ofthe circuit breaker is shown in Fig. 1. The free linkage 2 was fractured atthe position of 908 angle. It was found that 4Cr13 steel linkage was fractured in the circuit breaker. Fracture modes of many steels were ductile, brittle intergranular or transgranular, fatigue fracture, hydrogen-brittleness. The other reason of fracture failure was even the presence of flaws and foreign inclusion. Hou et al. [3] analyzed fracture mechanism of a 30CrMnSiA steel shaft was fatigue fracture resulting fromhydrogen-induced intergranular microcracks. The hydrogen-induced microcracks were caused by abnormal picking during production of the shaft. Sudhakar [4] suggested the failure mechanism of 360 stainless steel nail was predominantly ductile fracture facilitated by the presence of non-metallic inclusion. Pantazopoulos and Papaefthymiou [5] studied that fracture failure of austenitic stainless steel marine propeller shaft was originated from a surface flow where stress raiser acted as fatigue crack initiation. In this case study,the fracture morphology and mechanical properties of 4Cr13 stainless steel linkage components were investigated, and at the same time combined with the heat treatment process for the components, the failure mode of the component was studied.
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کلمات کلیدی:
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