다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

https://zenodo.org/record/1258680/files/article.pdf

The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy

Hall-Petch relation and boundary strengthening

Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

Recent advances in friction-stir welding : Process, weldment structure and properties

Crystallographic features of lath martensite in low-carbon steel

Tensile properties and twinning behavior of high manganese austenitic steel with fine-grained structure

Ultragrain refinement of plain low carbon steel by cold-rolling and annealing of martensite

In this study, the rate of dislocation accumulation in the tensile strained twinning induced plasticity (TWIP) steel was calculated via the X-ray diffraction (XRD) measurements and compared with other fcc metals and alloys. The results indicated that the XRD technique is an alternative method to estimate the dislocation density. Moreover, flow stress analysis of Fe–31Mn–3Al–3Si TWIP steel with the grain size of about 18 μm indicated that, beside a direct effect of the dislocation interactions on the flow stress, another strengthening mechanism is also required to describe the flow behavior. For this reason, the strengthening contribution due to the formation of mechanical twins was considered as a reduction of dislocation mean free path. Interestingly, the estimated flow stress equation consisting of the strengthening effects of both dislocation interactions and dynamic microstructure refinement due to mechanical twinning (i.e., the dynamic Hall–Petch effect) are in good agreement with the experimental data and equation proposed by Ludwigson for low SFE materials.

Rintaro Ueji

Papers

Crystallographic features of lath martensite in low-carbon steel

Tensile properties and twinning behavior of high manganese austenitic steel with fine-grained structure

Ultragrain refinement of plain low carbon steel by cold-rolling and annealing of martensite

Flow stress analysis of TWIP steel via the XRD measurement of dislocation density

A new and simple process to obtain nano-structured bulk low-carbon steel with superior mechanical property