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Rhee, Kyong Yop; Kwak, Dai-Soon; Oh, Taek-Yul

doi:10.1023/a:1014312301037

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…The Vickers microhardness test of the TLWB cross-section shows a higher hardness in the weld zone, as compared to the individual base metals in Fig 4. It is found in all the three combinations of TLWBs addressed here, the hardness of the weld bead is about 1.25/1.6/1.9 times higher than that of the respective base metal in corresponding combination, which is typical of the laser welding process as reported by other investigations [9,10] . The complicated morphologies of ferrite in the weld zone as described in section4.1 leads to this results.…”

Section: The Results Of Microhardness Measurementsupporting

confidence: 83%

A study on laser weldability and formability of high thickness ratio tailor welded blanks

Wang

Cai

et al. 2007

SPIE Proceedings

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Cold-rolled steel sheets of thickness ranging from 0.7 (with zinc coating) to 2.0 mm were used to produce tailor laser welded blanks (TLWBs) with various thickness ratios, the maximum of which reaches 2.86:1. In this study, the laser weldability and formability of the TLWBs, as well as the mechanical characteristics of the weld zones, were analyzed experimentally under the effects of various thickness ratios of TWLBs. The results showed that the hardness of the weld beads are 1.9 times higher than respective parent metal at most but the formability of TLWBs as evaluated by the Erichsen cup test was lower than that of the parent material.

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Section: The Results Of Microhardness Measurementsupporting

confidence: 83%

A study on laser weldability and formability of high thickness ratio tailor welded blanks

Wang

Cai

et al. 2007

SPIE Proceedings

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“…8. Although a similar fracture trend has been reported for low carbon and interstitial free steels, 7,15) the failure was mainly associated with fracture mode of no cracking in high stress range. In this study, slip bands played an important role in fatigue cracking.…”

Section: Fatigue Properties (1) High-cycle Fatigue Test Resultssupporting

confidence: 78%

High-Cycle Fatigue Properties of Automobile Cold-Rolled Steel Sheet with Stress Variation

Jeong

2013

Mater. Trans.

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Since many components in the automotive body and chassis are produced by various manufacturing processes, have different chemical compositions, and are subjected to complex loading cycles, it is important to understand their loading mechanisms and susceptibility to damage. This research examined the mechanical properties of cold-rolled steel sheets and evaluated the effects of stress variations on fatigue behavior. Specifically, a series of load-controlled high-cycle fatigue tests were conducted by varying the stress levels of SPCC and SPRC340 sheet materials. The results showed that fatigue life and the fatigue limit increased with higher tensile and yield strengths. In addition, testing results indicated that the fatigue limit was higher than the monotonic yield strength due to cyclic hardening with plastic deformation during fatigue cycling. Regarding tensile properties upon pre-deformation, the yield strength increased with a higher amount of pre-deformation and was greater than the fatigue limit after deformation. Based on these experimental results, two types of fracture modes were observed under the applied stress range. General fatigue fracture mode, which denotes failure by crack initiation, propagation and final rupture at low stress amplitude, was observed with fatigue lives larger than 4 © 10 5 cycles. On the other hand, constrained fracture mode occurred at stress levels higher than 0.89 times the tensile strength and exhibited a fracture surface without fatigue crack initiation or propagation.

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