Kyushu University · 공학
아바라 라바쿠마르 교수의 연구실은 철강 재료의 거친 미세구조와 기계적 거동을 중심으로, 특히 변형유도플라스티시티(TRIP)를 갖는 다상강철, 고엔트로피합금 기반 바인더 재료, 그리고 탄성 및 비선형 거동을 보이는 철계 합금의 물성 메커니즘을 연구하고 있습니다. 고강도·고연성 다이아몬드 기반 케라믹스, 마이크로소프트의 미세압연 거동, 그리고 심층에서의 비선형 거동 분석을 위한 실시간 X선 회절 기법을 응용한 정밀 분석도 진행 중입니다. 특히, 고성능 철강 소재의 설계와 수명 연장에 기여할 수 있는 미세구조 제어 전략 개발이 핵심 과제입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The progress of civilization can be, in part, attributed to our ability to employ metallurgy. This book is an introduction to multiple facets of physical metallurgy, materials science, and engineering. As all metals are crystalline in structure, attention is focussed on these structures, and how the formation of these crystals is responsible for certain aspects of the material's chemical and physical behaviour. The book also discusses the mechanical properties of metals, the theory of alloys, an
Indentation Size Effect (ISE) in steels having a wide spectrum of carbon (C) concentrations (wt-%) 0.002 (interstitial-free), 0.07 (microalloyed), 0.19 (low carbon), 0.32 (medium carbon), and 0.7 (high carbon), and microstructures were investigated using Vickers micro-hardness tester. A decrease in micro-hardness with increasing load, i.e. ISE, is observed in all the samples except microalloyed steel. The empirical relations, such as the Nix and Gao model, Minimum Resistance model, and Proportio
The current review gives an insight into high-entropy alloys (HEAs) as a new possible binder material for the tungsten carbides, heavy tungsten alloys, and titanium carbo-nitride (Ti(C,N)) based cermet composites. The existing binder materials (for instance, Co, Ni, etc.), produced by powder metallurgy methods, have limited tool bits performance and short service life while mining applications; however, replacing existing binders with more accurate binder material is still a great challenge for
Abstract Multi-phase steels showing transformation induced plasticity (TRIP), can exhibit an excellent combination of high strength and good ductility by the aid of martensitic transformation during deformation. Even though TRIP-assisted multi-phase steels have been widely used in industry, the role of each phase in the enhancement of mechanical properties is still unclear given their complicated microstructures. In order to understand better the nature of the TRIP effect, the mechanical interac
In general, the stress-strain relationship of materials obtained by standard uniaxial tensile test, which can identify the hardening behavior only up to necking. Beyond necking, the material behavior is usually estimated by extrapolating or numerical modelling based on hardening behavior prior to the uniform elongation. This study investigated the post-necking hardening behavior of a fully martensitic steel by in-situ synchrotron X-ray diffraction during tensile deformation. From the in-situ res
TRIP-assisted multiphase steels are gradually finding employment in the automotive industry for their excellent strain-hardening characteristics. In the current study, in a comparatively lean composition steel, different combinations of multiple phases such as ferrite, austenite and martensite, were obtained by heat-treatment, consisting of Inter-critical annealing followed by partitioning treatment for different holding times. It was observed that, with increasing isothermal holding time, the v
