检索结果-南通市图书馆

Microstructure-Property Relationship of High Strength Low Alloy Steels During Tensile Testing at High Strain Rates

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 869-873页

作者： Moss Matthew Timokhina Ilana hodgson peter Institute for Technology Research and Innovation Deakin UniversityGeelongVictoria3217Australia

The influence of strain-rate on the room temperature mechanical properties of Dual-Phase and Transformation Induced Plasticity (TRIP) steels was *** results showed that both plastic strain,and strength properties increased with increasing strain rates at high strain *** strain rates lower than approximateil 1s-1 the properties no longer have an advantageous proportionality to strain rate and remain strain rate *** explanations are offered for trends exhibited,in terms of thermal and athermal considerations,in relation to the respective microstructures of the two steels.

关键词： TRIP dual-phase steel high strain rate microstructure strain-rate sensitivity

Effect of Composition and Processing Parameters on the Formation of Nano-Bainite in Advanced High Strength Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 238-241页

作者： Ilana Timokhina Hossein Beladi peter hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongVIC 3217

The nano-bainitic microstructures were compared in a 0.79C-1.5Si-1.98Mn-0.24Mo-1.06Al (wt%) steel after isothermal heat-treatment and a Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb (wt%) steel after controlled thermomechanical *** microstructure for both steels consisted of *** microstructural characteristics of bainite,such as the morphology of the nano-bainite and thicknesses of bainitic ferrite and retained austenite layers,as a function of steel composition and processing was studied using transmission electron microscopy (TEM).It was found that the nano-bainitic structure can be formed in the low alloy steel through thermomechanical *** probe tomography (APT) was employed as a powerful technique to determine local composition distributions in three dimensions with atomic *** important conclusions from the APT research were that the carbon content of bainitic ferrite is higher than expected from paraequilibrium level of carbon in ferrite for both steels and that Fe-C clusters and fine particles are formed in the bainitic ferrite in both steels despite the high level of Si.

关键词： nano-bainite transmission electron microscopy atom probe tomography carbon content

Enhanced tensile properties of a reversion annealed 6.5Mn-TRIP alloy via tailoring initial microstructure and cold rolling reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第8期34卷 1428-1435页

作者： Minghui Cai Hongshou Huang Junhua Su Hua Ding peter D.hodgson School of Materials Science and Engineering Northeastern University Institute for Frontier Materials Deakin University

The feasibility of improving the overall performance of medium Mn steels was demonstrated via tailoring the initial microstructure and cold rolling reduction. The combined effects of cooling patterns after hot rolling （HR） and cold rolling （CR） reductions show：（1） as the cooling pattern varied from furnace cooling （FC） to oil quenching （OQ）, the intercritically annealed microstructure was dramatically refined and the fraction of recrystallized ferrite dropped, regardless of CR reductions. This resulted in both high yield/ultimate tensile strengths （YS/UTS） but low total elongation to fracture （El）; （2） as the CR reduction increased from 50% to 75%, the OQ-samples after annealing exhibited a more refined microstructure with relatively higher fractions of retained austenite and sub-structure, leading to higher YS and UTS but lower El; whereas the FC samples appeared to exhibit little difference in overall tensile properties in both cases. The differences in microstructural evolution with cooling patterns and CR reductions were explained by the calculated accumulated effective strain （eAES）, which was considered to be related to degrees of recovery and recrystallization of the deformed martensite （α＇）. The optimal tensile properties of -1 GPa YS and -40 GPa.% UTSxEI were achieved in the OQ-50%CR annealed samples at 650 ℃ for 1 h. This was quite beneficial to large-scale production of ultra-high strength steels, owing to its serious springback during heaw cold working.

关键词： Medium Mn steel Reversion annealing Microstructural evolution Mechanical properties Initial microstructure Cold rolling

Rolling-assisted direct energy deposited Inconel 718:Microstructural evolution and mechanical properties after optimized heat treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第13期144卷 118-127页

作者： Chen Li peter hodgson Michael Preuss Yu Chen Xinhua Wu Yuman Zhu Yang Tian Aijun Huang Department of Material Science and Engineering Monash UniversityClaytonVIC 3800Australia Monash Centre for Additive Manufacturing(MCAM) 15-17 Normanby RdNotting HillVIC 3168Australia Institute for Frontier Materials Deakin UniversityGeelongVIC 3217Australia Monash Centre for Electron Microscopy Monash University10 Innovation WalkClaytonVIC 3800Australia

Post-heat treatment is a necessary and important step for additive-manufactured products to relieve residual stress and to further improve mechanical *** this work,the heat treatment strat-egy for Inconel 718 superalloy fabricated by rolling-assisted laser-directed energy deposition(L-DED)has been designed and systematically investigated for the first *** results show that the designed ho-mogenization heat treatment at 1080℃ for 10 min can effectively dissolve most of the detrimental Lave phases existing in the rolling-assisted L-DED ***,it results in a homogenous grain struc-ture through static recrystallization,while maintaining a similar prior-refined grain size of∼8μ*** this basis,a high number density ofγ″andγ′precipitates appear in the microstructure after applying a subsequent double-aging heat *** optimized microstructure through such effective post-heat treatment designed in this work has led to a significant increase in material strength at both the room and elevated temperatures while maintaining good ductility.

关键词： Additive manufacturing Nickel superalloy In-situ rolling Heat treatment Mechanical properties

The Evolution of Ultrafine Grained Structure Formation Through Isothermal Static Phase Transformation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 218-222页

作者： HOSSEIN Beladi ILANA B Timokhina SUBRATA Mukherjee peter D hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongAustraliaVic 3216

In the current study,a 0.3C-2Si-2Mn-0.28Mo (in wt%) steel with high hardenability was deformed at a relatively low temperature followed by isothermal static phase *** novel thermomechanical processing made it possible to successfully produce an ultrafine ferrite grained structure (～2 μm) in the absence of both dynamic phase transformation and controlled *** use of a model Ni-30Fe austenitic alloy showed that the low temperature deformation induced very fine intragranular defects throughout the microstructure,which would then act as fine spaced ferrite nucleation sites at an early stage of phase *** a result,the coarsening of ferrite was extremely limited during isothermal phase transformation,resulting a very fine ferrite grained structure;even nanoscale in the region of the prior austenite grain boundary.

关键词： ultrafine ferrite warm deformation isothermal phase transformation substructure

Microstructure and Tensile Properties of a Nb–Mo Microalloyed 6.5Mn Alloy Processed by Intercritical Annealing and Quenching and Partitioning

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 665-674页

作者： Ming-Hui Cai Hong-Shou Huang Hai-Jun Pan Sheng-Hui Sun Hua Ding peter hodgson School of Materials Science and Engineering Northeastern University Institute for Frontier Materials Deakin University

The transformation behavior, microstructural evolution and mechanical properties were compared in a coldrolled Nb–Mo microalloyed 6.5Mn alloy after intercritical annealing（IA） and quenching and partitioning（Q ＆ P）,respectively. The thermodynamic calculation and theoretical analysis were used to determine the optimal heat treatment parameters. The Q ＆ P samples exhibited relatively higher strength with relatively low ductility, mainly due to the hard martensite matrix, which resulted in continuous yielding behavior upon loading, whereas the IA samples showed the significantly improved ductility, which benefited from the more sufficient transformation-induced plasticity（TRIP） effects and the softer ultrafine ferrite matrix. The dependence of yield point elongation（YPE） of IA samples on grain size demonstrated that the YPE value was in the reverse proportional relationship to the average grain size, which agreed well with theoretical analysis.

关键词： Medium Mn steel Intercritical annealing Quenching and partitioning Mechanical properties TRIP effect Yield point elongation

Fabrication,Microstructure and Mechanical Properties of High Performance Ferrite-bainite Steels

在线全文

学校读者我要写书评

暂无评论

Fabrication,Microstructure and Mechanical Properties of High...

Asia Steel International Conference 2012(Asia Steel 2012)

作者： peter D hodgson Institute for Frontier Materials Deakin UniversityGeelongVIC 3216Australia

＜正＞Low cost ferrite and bainite（FB） steels offer the prospect of high ultimate tensile strength combined with high hole expansion *** enhanced strain hardening and formability of FB steels were primarily associated with the fine ferrite matrix,the low residual stresses and dislocation density and compatible deformation between both *** overview describes the various techniques to produce FB steels,and compares the resulting microstructure,tensile properties and stretch-flangeability with conventional HSLA and DP steels.A new generation of ultrafine ferrite and nano-scale bainite automotive steels is under development for the future demands of extremely high strength and ductility through the fabrication technologies involving phase transformations and plastic deformation.

关键词： ferrite bainite thermo-mechanical processing mechanical properties stretch-flange ability

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

能源、环境和气候变化

国外科技新书评介 2013年第11期 10-11页

作者： hodgson peter E 吴永礼不详中国科学院力学研究所

人类生活在地球上已有几万年，他们与自然环境相对和谐。人类早期的活动并不影响地球的气候。然而，在过去的200年里，由于我们广泛应用的技术，人与环境和平共处的状态已经极大地改变了。新的农业技术极大地提高了土地的生产力，使人... 详细信息

人类生活在地球上已有几万年，他们与自然环境相对和谐。人类早期的活动并不影响地球的气候。然而，在过去的200年里，由于我们广泛应用的技术，人与环境和平共处的状态已经极大地改变了。新的农业技术极大地提高了土地的生产力，使人口迅速上升。19世纪的工业革命大大提高了许多国家的生活水平；

关键词：气候变化环境相能源人类生活农业技术人与环境工业革命生产力

Millipede forming-a new metal forming approach

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Baosteel Technical Research 2010年第S1期4卷 39-页

作者： peter D hodgson John L DUNCAN Institute for Technology Research and Innovation(ITRI) Deakin University GeelongVic3217Australia

Millipede Forming is a novel metal forming method that has been proposed and developed *** can be applied to overcome fundamental limitations in conventional roll forming,and,in addition,used for incremental forging and integrated into a strip casting or extrusion process for downstream thickness reduction. In this new method,there are two main principles:①the use of an optimal transitional surface or space linking of the incoming material to the outgoing product,and②implementation of a method to feed the material through the forming device so that it conforms with this ideal space and the required deformation is imposed on it by the tooling. The system described here is called "Millipede forming" because deformation is accomplished in a large number of small steps.A prototype has been built to demonstrate the working principle applied to the replacement of a roll forming process;it can be used to produce simple profiles within a forming length an order of magnitude shorter than the conventional process. In this paper,the working principle of "Millipede forming" is introduced and some fundamental research on forming a channel section and a circular tube is *** the success of the small scale prototype, research on a full scale pilot machine has been *** is expected that this process can be developed and extended as a useful alternative to conventional roll forming,incremental forging and within a strip casting or other novel strip material(*** metals) system.

关键词： millipede forming roll forming incremental forging strip casting redundant deformation transitional surface ideal deformation space