دانلود رایگان مقاله لاتین اثر جوش بر عملکرد کشش فولاد از سایت الزویر
عنوان فارسی مقاله:
اثر جوش بر عملکرد کششی استحکام بالا فولاد اتصالات T-خرد
عنوان انگلیسی مقاله:
Effects of Welding on the Tensile Performance of High Strength Steel T-stub Joints
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Structural steel is one of the most popular materials employed in civil engineering construction due to its high strength, stiffness, toughness and ductile properties [1]. With the development of design, fabrication and technology, the evolution of steels for construction never stops. In the 1900s, most primary structural steel only had nominal yield strengths of about 220 MPa, which is equivalent to today's “mild steel” [2]. The once so called “high strength” steel S355 is now a widely used structural material. In fact, steels with yield strength up to 460 MPa have been commonly specified for applications in many structural design codes [3,4]. What is more, the interest for using high strength (HSS) with minimum yield strength N460 MPa in application have been increasing in the last decade. Strength of steel is usually enhanced by either adding alloying elements or going through heat treatments/work hardening. Different from high alloy steels, heat treated steels offer better performance in yield and tensile strength without sacrificing much weldability, e.g., low alloy quenched and tempered HSS in grade S690. For many types of HSS such as the quenched and tempered S690 steel, the actual yield strength can be easily double that of grade S355 normal strength steel (NSS). However, HSS differs from NSS in much more aspects than just strength. One major issue against the popularization of HSS is that the quenching and tempering process improves the strength at the expense of ductility through complicated heat treatments. Massive researches have demonstrated that it is not possible for QT steels to achieve good deformation capacity [2,5,6] and they are more susceptible to heat [7, 8] than mild steels, as inherited from the heat-treatment hardened microstructures [9]. Accordingly, it is not surprising that concerns are raised about the performance of welded high performance steel connections, especially when large heat input welding is applied [10]. For conventional steels, it is suggested that if the width of the soft zone does not exceed 25% of the plate thickness, the local softening would not necessarily impair the global strength due to the constraints of the stronger weld metal and unaffected base metal [11,12]. However, this criterion may not apply on high performance steels, because their main constitutes in the microstructures, such as martensite and bainite, are not stable at high temperatures [13]. There is a possibility that the enhanced mechanical properties acquired by means of hardening may deteriorate significantly after exposure to heat, due to microstructural changes at certain critical temperatures [9,14]. The objective of this paper is to investigate the effect of welding on the tensile performance of high strength steel, i.e. Reheated, Quenched and Tempered (RQT) Steel in grade S690 by both experimental and numerical methods. As control material, the Thermal-Mechanical Controlled Processed (TMCP) steel in grade S385 is employed in the experimental program. Eight T-stub joints in the same configuration but different materials and thicknesses are fabricated and tested. Based on the test results in terms of load-displacement curves, the first yield resistance is obtained and compared with predictions by design equations provided by EN 1993-1-8 [15]. Further, finite element simulation is carried out to investigate the influence of welding induced HAZ on the tensile performance of the RQT-S690 joints. By comparing the load-displacement curves and the first yield resistance, the effects of welding on the high strength steel T-stub joints are evaluated.
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کلمات کلیدی:
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