Deformation mechanisms and enhanced mechanical properties of 304L stainless steel at liquid nitrogen temperature

As a solid-state welding technology, friction stir welding (FSW) can join dissimilar materials with good mechanical properties. In this paper, friction stir welding between 304L stainless steel and commercially pure copper plates with thicknesses of 3 mm was performed. A number of FSW experiments were carried out to obtain the optimum mechanical properties by adjusting the rotational speed to 1000 rpm and welding speed in the range of 14-112 mm/min and with an adjustable offset of the pin location with respect to the butt line. Microstructural analyses have been done to check the weld quality. Cross-sectioning of the welds for metallographic analysis in planes perpendicular to the welding direction and parallel to the weld crown was also performed. The mechanical properties of the welds were determined using a combination of conventional microhardness and tensile testing. From this investigation it is found that the offset of the pin is an essential factor in producing defect free welds in friction stir welding of copper and steel.

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Dynamic Mechanical Properties and Fracture Behavior of a 304L Stainless Steel GTAW Joint under Shear Conditions

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.44.2637 ◽

2003 ◽

Vol 44 (12) ◽

pp. 2637-2645 ◽

Cited By ~ 3

Author(s):

Woei-Shyan Lee ◽

Jen-I Cheng ◽

Chi-Feng Lin ◽

Chen-Yang Liu

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Fracture Behavior ◽

Dynamic Mechanical Properties ◽

304L Stainless Steel ◽

Dynamic Mechanical

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Experimental Investigation of Hydrogen Effect on Mechanical Properties of 304L Stainless Steel

Volume 6: Materials and Fabrication, Parts A and B ◽

10.1115/pvp2008-61316 ◽

2008 ◽

Author(s):

Yong Jiang ◽

Jianming Gong ◽

Jianqun Tang ◽

Luyang Geng

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

304L Stainless Steel ◽

Hydrogen Effect ◽

Reliable Operation ◽

Hydrogen Charging ◽

Before And After ◽

Hydrogenation Reactor ◽

Purified Terephthalic Acid ◽

Longitudinal Cracks

Hydrogenation reactor is one of the key equipments in the production process of purified terephthalic acid (PTA). The safe and reliable operation of hydrogenation reactor decides the safety of PTA installation. Service experience has shown that some longitudinal cracks occurred on the internal wall of the 304L stainless steel (SS) hydrogen nozzle. In this paper, a series of electrochemical hydrogen charging tests were carried out for 304L stainless steel at the ambient temperature. The comparison on mechanical properties was investigated before and after hydrogen charging in order to investigate the effect of mechanical properties of 304L SS. Fractography was analyzed by using scanning electron microscope (SEM). The results showed that the mechanical strength of 304L SS was not basically lost after hydrogen charging, but the ductility reduced in a certain extent. The fractography also showed the hydrogen embrittlement effect on the fracture.

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