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Low temperature friction stir welding of P91 steel

Defence Technology（防务技术） 2016年第4期12卷 285-289页

作者： Prasad Rao KALVALA Javed AKram Mano MISRA Damodaram ramACHANDRAN janak. ram gabbita University of Utah Salt Lake City USA SSN College of Engineering Kalavakkam India Indian Institute of Technology Madras Chennai India

Bead-on-plate friction stir welds were made on P91 alloy with low and high rotational speeds(100 and 1000 RPM) to study their effects on weld microstructural changes and impression creep behavior. Temperatures experienced by the stir zone were recorded at the weld tool tip. Different zones of welds were characterized for their microstructural changes, hardness and creep behavior(by impression creep tests). The results were compared with submerged arc fusion weld. Studies revealed that the stir zone temperature with 100 RPM was well below A_(c1) temperature of P91 steel while it was above A_(c3) with 1000 RPM. The results suggest that the microstructural degradation in P91 welds can be controlled by low temperature friction stir welding technique.

关键词： Friction stir welding P91 Low temperature Martensite Carbides Impression creep

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A New Species of Megophryid Frog of the Genus Scutiger from Kangchenjunga Conservation Area, Eastern Nepal

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Asian Herpetological Research 2019年第3期10卷 139-157页

作者： janak.Raj KHATIWADA Guocheng SHU Tulsi ram SUBEDI Bin WANG AnnemarieOHLER David CCANATELLA Feng XIE Jianping JIANG Chengdu Institute of Biology Chinese Academy of SciencesChengdu610041China Centre for Marine and Coastal Studies(CEMACS) Universiti Sains MalaysiaPulau Pinang11800Malaysia Institut de Systématique évolutionBiodiversitéMuséum national d’Histoire naturelleCNRS MNHN UPMC EPHESorbonne UniversitésCP307500525rue CuvierParis75005France Department of Integrative Biology University of TexasAustinUSA University of Chinese Academy of Sciences Beijing100049China

This study investigated the systematics of the megophryid genus Scutiger from eastern and western Nepal using molecular and morphological data. Our results support two divergent lineages, one of which has nuptial spines on the dorsal surface of the first three fingers while the other has spines only on the dorsal surface of the first two fingers. The Ghunsa lineage from eastern Nepal shows significant morphological and molecular differences to other species of genus Scutiger and is here described as a new species. Based on the molecular analysis, the Muktinath lineage from western Nepal is confirmed to be Scutiger boulengeri and represents a species complex widespread throughout the Himalayan region. The newly described taxon is endemic to the eastern Himalayas and currently known only from the Ghunsa valley, Taplejung district, Nepal.

关键词： Scutiger New species Eastern Himalaya Nepal

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