Abstract Multiphase ultra-high strength steels (UHSS) containing retained austenite (RA) appear to be among the most interesting for automotive industry. Developments in last decades have allowed obtaining a very good combination of mechanical and ductility. Quenching partitioning (Q&P) been proposed as third-generation UHSS, reaching ultimate tensile up 1300 MPa along with excellent fractu...

With fossil fuels being phased out and growing global interest in a hydrogen economy, there is demand for re-purposing existing pipelines transportation of gas. However, embrittlement (HE) can limit pipeline steel’s performance. In this study, the effect on mechanical properties an X60 base metal (polygonal ferrite/pearlite) its girth weld (acicular was measured with novel slow strain rate tens...

금속의 취성화는 수소와 접촉하는 구조물을 안정적으로 설계하는데 있어서 큰 문제가 되어왔다. 본 논문에서는 분자동역학 해석을 통해 균열선단 주변에 모인 수소원자들이 전위 이동 현상을 억제하고, 이로 인해 벽개 파괴 현상이 발생하는 것을 확인하였다. 다양한 수소 농도, 하중 속도, 확산 속도 등을 바꾸어가며 수행하였고, 이에 따른 취성화를 최소화시킬 수 있는 조건들을 조사하였다. 해석 결과는 기존의 실험결과와 잘 일치하였으며 이를 바탕으로 취성화 정량화하여 평가하였다.

The effects of the electrogalvanizing conditions (a combination plating current and time) on hydrogen infusion, embrittlement, corrosion-induced embrittlement (HE) behaviors ultra-high strength steel were examined. A range experimental analytical methods, including electrochemical impedance spectroscopy, permeation, polarization, slow strain rate test, employed. results showed that applied cath...

Gold embrittlement of solder joints has been written about for at least four decades [1 – 3]. Nevertheless, gold embrittlement related solder joint failures have been analyzed in this laboratory as recently as July 2009. Gold embrittlement can be avoided by careful solder joint design and knowledge of the causes of this condition. The purpose of this paper is to provide a detailed account of ma...

Spot-welded advanced high-strength steel (AHSS) sheets are used to decrease car body weight and enhance crashworthiness simultaneously. Such welds susceptible hydrogen embrittlement, but research in this area is limited. We have evaluated the embrittlement properties of spot fabricated with AHSS clarified dependence diffusible content tensile rate on shear strength. However, performance must be...

Embrittlement caused by injection molding was investigated on a commercial grade of Polybutylene terephthalate (PBT). The effect temperature and residence time in the barrel mechanical properties studied. Results were discussed from macromolecular analysis Gel Permeation Chromatography crystallinity measurements differential scanning calorimetry. It shown that embrittlement exclusively occurs c...

In pressure vessels contain hydrogen, the role of hydrogen will be important because of hydrogen cracking problem. It is difficult to predict what is happened in metallurgical field spite of a lot of studies have been searched. The main role in controlling the mass diffusion as driving force is related to stress. In this study, finite element analysis is implemented to estimate material’s behav...

Owing to their glassy nature, metallic glasses demonstrate a toughness that is extremely sensitive to the frozen-in configurational state. This sensitivity gives rise to "annealing embrittlement," which is often severe and in many respects limits the technological advancement of these materials. Here, equilibrium configurations (i.e., "inherent states") of a metallic glass are established aroun...