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| 1 | Analytical Investigation of Prior Austenite Grain Size Dependence of Low Temperature Toughness in Steel Weld Metal显示文摘Prior austenite grain size dependence of the low temperature impact toughness has been addressed in the bainitic weld metals by in situ observations.Usually,decreasing the grain size is the only approach by which both the strength and the toughness of a steel are increased.However,low carbon bainitic steel with small grain size shows a weakening of the low temperature impact toughness in this study.By direct tracking of the morphological evolution during phase transformation,it is found that large austenite grain size dominates the nucleation of intragranular acicular ferrite,whereas small austenite grain size leads to grain boundary nucleation of bainite.This kinetics information will contribute to meet the increasing low temperature toughness requirement of weld metals for the storage tanks and offshore structures. | X.F. Zhang P. Hall H. Terasak M. Sato Y. Komizo | 2012 | Journal of Materials Science & Technology2012，28，3： | 4 |
| 2 | Development of Evaluation Technique of GMAW Welding Quality Based on Statistical Analysis显示文摘Nondestructive techniques for appraising gas metal arc welding(GMAW) faults plays a very important role in on-line quality controllability and prediction of the GMAW process. On-line welding quality controllability and prediction have several disadvantages such as high cost, low efficiency, complication and greatly being affected by the environment. An enhanced, efficient evaluation technique for evaluating welding faults based on Mahalanobis distance(MD) and normal distribution is presented. In addition, a new piece of equipment, designated the weld quality tester(WQT), is developed based on the proposed evaluation technique. MD is superior to other multidimensional distances such as Euclidean distance because the covariance matrix used for calculating MD takes into account correlations in the data and scaling. The values of MD obtained from welding current and arc voltage are assumed to follow a normal distribution. The normal distribution has two parameters: the mean ? and standard deviation of the data. In the proposed evaluation technique used by the WQT, values of MD located in the range from zero to ?+3? are regarded as 'good'. Two experiments which involve changing the flow of shielding gas and smearing paint on the surface of the substrate are conducted in order to verify the sensitivity of the proposed evaluation technique and the feasibility of using WQT. The experimental results demonstrate the usefulness of the WQT for evaluating welding quality. The proposed technique can be applied to implement the on-line welding quality controllability and prediction, which is of great importance to design some novel equipment for weld quality detection. | FENG Shengqiang TERASAKI Hidenri KOMIZO Yuichi HU Shengsun CHEN Donggao MA Zhihua | 2014 | Chinese Journal of Mechanical Engineering2014，27，6： | 3 |
| 3 | Priciple of Superplastic Diffusion Bonding显示文摘 | Maehara Y Komizo Y Langdon T G | 1988 | Materials Science and Technlogy1988，4，8： | 2 |
| 4 | Solidification cracking susceptibility of alloy tool steel under rapid solidification显示文摘 | HASHIMOTO T TERASAKI H KOMIZO Y | 2009 | Quarterly Journal of the Japan Welding Society2009，27，2： | 1 |
| 5 | Microstructure and precipitation behavior in heat affected zone of C-Mn microalloyed steel containing Nb,V,and Ti显示文摘 | Hamada M Fukada Y Komizo Y | | 0，，10： | 1 |
| 6 | In situ observation of phase transformation in Fe–0.15C binary alloy显示文摘 | Di Zhang Hidenori Terasaki Yu-ichi Komizo | 2009 | Journal of Alloys and Compounds2009，，1： | 1 |
| 7 | Study on critical CTOD property in heat affected zone of microalloyed steel 显示文摘 | Fukada Y Komizo Y | 1992 | Transactions of the Japan Welding Society1992，23，2： | 1 |
| 8 | In Situ Observation of Morphological Development for Acicular Ferrite in Weld Metal 显示文摘 | Terasaki H Komizo Y | 2005 | Science and Technology of Welding and Joining2005，11，5： | 1 |
| 9 | Influence of martensitic islands on fracture behaviour of high heat-input weld HAZ显示文摘 | Suzuki S Kamo T Komizo Y | 2007 | Journal of the Japan Welding Society2007，5，4： | 1 |
| 10 | Diffusional and displacive transformation behaviour in low carbon-low alloy steels studied by a hybrid in situ observation system 显示文摘 | Hidenori Terasaki Yu-ichi Komizo | 2011 | Scripta Materialia2011，64，： | 1 |
| 11 | Microstructure and precipitation behavior in heat affected zone of C-Mn microalloyed steel containing Nb,V and Ti显示文摘 | Hamada M Fukada Y Komizo Y | 1995 | ISIJ International1995，35，10： | 1 |
| 12 | Effect of tensile strength and boron addition on microstructure and toughness of weld metal containing Ti显示文摘 | HAMADA M OKAGUCHI S KOMIZO Y | 2009 | Welding International2009，27，10： | 1 |
| 13 | In-situ observation of solidification behav-ior during welding显示文摘 | Komizo Y Terasaki H | 2010 | Materials Science Forum2010，，： | 1 |
| 14 | In situ observation of morphological development for aeicular ferrite in weld metal 显示文摘 | Terasaki H Komizo Y | 2006 | Science and Technology of Welding and Joining2006，11，5： | 1 |
| 15 | Improvement of welded HAZ toughness by dispersion with nitride particles and oxide particles 显示文摘 | MUTSUO NAKANISHI YU-ICHI KOMIZO | 1983 | J JPN Weld Soc1983，52，2： | 1 |
| 16 | Principles of superplastic diffusion bonding 显示文摘 | Maehara Y Komizo Y Langdon T G | 1988 | Materials Science and Technology1988，14，4： | 1 |
| 17 | Microstructure and precipitation behavior in heat affected zone of C - Mn microalloyed steel containing Nb, V and Ti 显示文摘 | Hamada M Fukada Y Komizo Y | 1995 | ISIJ International1995，35，10： | 1 |
| 18 | Relation between Inclusion Surface and Acicular Ferrite in Low Carbon Low Alloy Steel Weld 显示文摘 | Yamada T Terasaki H Komizo Y | 2009 | ISIJ International2009，49，7： | 1 |
| 19 | Improvement of Welded HAZ Toughness by Dispersion With Nitride Particles and Oxide Particles显示文摘 | Mutsuo Nakanishi Yu-ichi Komizo | | 0，，02： | 1 |
| 20 | Recent De-velopment of Large Diameter Line Pipe ( X80 and X100Grade) 显示文摘 | Hashimoto Y Komizo T Tsukamoto M | 1988 | The Sumitomo Search1988，37，： | 1 |
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