http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Correlation Between Constituent Phase and Weld Metal Properties in Ni-Reduced Duplex Stainless Steel
Youngchai Lee,Jae Hee Lee,Joonoh Moon,Tae‑Ho Lee,Changhee Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
The intrinsic properties of austenite and ferrite on the mechanical properties and corrosion resistance of the duplex stainlesssteel weld metals was studied by substituting Ni with Mn, N, and Mn + N. The properties of the weldments fabricated throughgas tungsten arc welding (GTAW) were evaluated using tensile test, Vickers hardness, and potentiodynamic polarizationtests. The mechanical properties and corrosion resistance of the constituent phases were measured using nanoindentationand electron probe microanalysis, respectively. The austenite and ferrite phase fractions of the weld metal were maintainedat approximately 50:50, and no harmful phases degraded the properties. Excessive Mn decreased the corrosion resistance; alarge difference in corrosion resistance between austenite and ferrite also decreased the overall corrosion resistance. In thefiller metal in which Ni was replaced with only Mn or N, the austenite became harder than ferrite, as a result cracks initiatedinside the austenite. The tensile test showed that austenite, which became a relatively hard phase compared to ferrite accordingto the chemical composition, increased the yield strength and decreased the elongation of the weld metal.
Changhee Lee,Inseok Park,Jungbin Kim,Hyunjin Cho,Keunho Yang,Yujin Lee,Kyeongmee Park,Jiyoung Kim,신영주,Geumhee Gwak 한국유방암학회 2021 Journal of Breast Disease Vol.9 No.1
Purpose: To investigate the characteristics of HER2-positive breast cancer according to HER2 low (2+) or high (3+) classification using immunohistochemistry (IHC). Methods: Data were collected from 205 HER2-positive breast cancer patients in the final assay, regardless of IHC or in situ hybridization (ISH). We thus classified patients into two groups: HER2 2+/low and HER2 3+/high based on the IHC assay. We subsequently compared the clinical and pathological characteristics between groups. Results: The median patient age was 49 years in the HER2 2+/low group and 53 years in the HER2 3+/high group. We observed a significantly lower Allred score for estrogen receptor (ER) and progesterone receptor (PR) (0-6) (p<0.001), less lymphatic invasion (LI), (p=0.010), neural invasion (p=0.041), higher Ki-67 (p=0.001), and lower Bcl-2 (p<0.001) in the HER2 3+/high group than in the HER2 2+/low group. Lymph node recurrence was more frequently observed in the HER2 2+/low group than in HER2 3+/high group (p=0.005). Disease-free survival (DFS) was better in the HER2 3+/high group than in the HER2 2+/low group (p=0.028), but there were no significant differences in overall survival between the groups (p=0.233). Conclusion: The HER2 3+/high group was associated with lower ER and PR expression, less LI, higher Ki-67, and lower Bcl-2 than that in HER2 2+/low group in HER2-positive breast cancer. Furthermore, compared to the HER2 2+/low group, the HER2 3+/high group had an improved DFS.
Lee, Illjoo,Park, Hyungkwon,Kim, Jaeick,Lee, Changhee Elsevier Sequoia 2016 Surface & coatings technology Vol.307 No.1
<P><B>Abstract</B></P> <P>Heavy steel automotive parts have been replaced with aluminum-based lightweight materials worldwide. In particular, grey cast iron engine blocks, which are very heavy components in vehicles, have been replaced by aluminum-silicon hypoeutectic alloys in order to reduce emissions and fuel consumption. However, aluminum alloys are not able to withstand severe engine cylinder conditions due to their poor mechanical properties. In this study, a Mo blended ferrous coating was fabricated using atmospheric plasma spraying to replace the grey cast iron liner in the automotive cylinder bore. Five fractions of Mo, 0, 5, 10, 15, and 20wt%, with ferrous powder were prepared to investigate the effect of Mo on the microstructure and mechanical properties of coatings. All of the Mo-added coating layers showed significantly improved mechanical properties, such as hardness and wear resistance compared to that of grey cast iron. However, as Mo content exceeded 10wt% of the blend, the tribological properties gradually degraded due to brittle fracture of Mo. As a result, 10wt% Mo blended with ferrous powder provided optimized mechanical properties and can be substitute for grey cast iron liners in the automotive industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mo-added ferrous coating to protect the automotive engine was investigated and it showed excellent mechanical properties. </LI> <LI> The Mo fraction was optimized to maximize the tribological property and minimize the amount of Mo. </LI> <LI> The effect of Mo fraction in the coating later was proven by various mechanical property measurements. </LI> <LI> The effect of Mo on fracture mechanism was investigated based on the microstructure analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Ji Hyun,Jung, Aeran,Park, Han Na,Lee, Changhee,Mandava, Suresh,Lim, Sung-jun,Lim, Byoung-bok,Park, Sung-Kwan,Lee, Jongkook,Kang, Hoil Elsevier 2018 Forensic Science International Vol.291 No.-
<P><B>Abstract</B></P> <P>Illicit psychoactive substances have threatened public health worldwide. An active metabolite of ADB-CHMINACA and MDMB-CHMINACA was identified for the first time in a powder-type product found in an airmail package. The structure of compound 1 was elucidated by a combination of gas chromatography-mass spectrometry (GC–MS), liquid chromatography-high resolution mass spectrometry (LC-HRMS), infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy. Compound 1 was proven to be an analogue of MDMB-CHMINACA, an indazole-based synthetic cannabinoid. The methyl ester group in MDMB-CHMINACA was replaced with a carboxylic acid group in compound 1. Compound 1 was determined as 2-[1-(cyclohexylmethyl)-1<I>H</I>-indazole-3-carboxamido]-3,3-dimethylbutanoic acid and named as DMBA-CHMINACA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new indazole-3-carboxamide class synthetic cannabinoid was identified. </LI> <LI> Compound 1 was named as DMBA-CHMINACA according to the EMCDDA guideline. </LI> <LI> DMBA-CHMINACA is a hydrolysed form of MDMB-CHMINACA. </LI> <LI> DMBA-CHMINACA is a potential CB1 and CB2 agonist. </LI> <LI> DMBA-CHMINACA can work as a synthetic precursor of several synthetic cannabinoids. </LI> </UL> </P>