Neural Network Construction of Heat Affected Zone Performance Evaluation at Large Heat Input Welding Steel

2018 ◽  
Vol 15 (3) ◽  
pp. 1076-1079 ◽  
Author(s):  
Shaoying Li ◽  
Yihua Han ◽  
Aimin Gao ◽  
Li-Guang Zhu ◽  
Kun Li
Keyword(s):  
Neural Network ◽  
Performance Evaluation ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Network Construction ◽  
Welding Steel ◽  
Large Heat

Effect of Nb Content on the Impact Toughness of Coarse-Grained Heat-Affected Zone of Pipeline Steels under Large Heat Input

2014 ◽  
Vol 1078 ◽  
pp. 3-7
Author(s):  
Feng Zhou ◽  
Zhou Gao ◽  
Kai Ming Wu
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Optical Microscope ◽  
Coarse Grained ◽  
Electron Backscattered Diffraction ◽  
Pipeline Steels ◽  
Nb Content ◽  
Large Heat ◽  
Austenite Grains ◽  
The Impact

The effect of large heat inputs (200 kJ/cm) on the microstructures and toughness of heat-affected zone of Nb microalloyed X70 pipeline steels were simulated utilizing Gleeble-3800. The microstructures were observed by optical microscope, scanning electron microscope and electron backscattered diffraction technique. Results showed that when the large heat input welding was applied, big austenite grains and coarse microstructures were formed in the coarse-grained heat-affected zone, and thus the toughness of the coarse-grained heat-affected zone was seriously reduced. With the increase of Nb content, the toughness of the CGHAZ did not change remarkably under the large heat input welding.

scholarly journals The Effect of Ca Content on the Formation Behavior of Inclusions in the Heat Affected Zone of Thick High-Strength Low-Alloy Steel Plates after Large Heat Input Weldings

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1328 ◽  
Author(s):  
Yinhui Zhang ◽  
Jian Yang ◽  
Longyun Xu ◽  
Yunlong Qiu ◽  
Guoguang Cheng ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Hsla Steel ◽  
Solidus Temperature ◽  
High Strength ◽  
Steel Plates ◽  
Ca Addition ◽  
Formation Behavior ◽  
Large Heat ◽  
Molten Liquid

Ca deoxidation has been acknowledged recently as an effective oxide metallurgy technology that improves the toughness of the heat affected zone (HAZ) in high-strength low-alloy (HSLA) steel plates after large heat input welding. This paper describes the effect of Ca concentrations on the formation behavior of the non-metallic inclusions in the HAZs of a series of thick HSLA steel plates after large heat input welding at 400 kJ cm−1. The quantitative statistics on the inclusions show that the Ca addition significantly decreases the quantity of the pure MnS sulfide, but increases that of the complex oxysulfide. The pure MnS sulfide precipitates below the solidus temperature, while the complex oxysulfide forms in the molten liquid, leading to the core (oxide) and shell (sulfide) structure. The Ca addition proportionally improves the HAZ toughness of these thick HSLA steel plates, primarily owing to the positive effect of the complex oxysulfides on the refinement of the HAZ microstructure.

Abnormal toughness characteristics and fracture model in simulated welding HAZ of 5%Ni Steel

2020 ◽  
Vol 117 (4) ◽  
pp. 410
Author(s):  
Ding Min
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Heating Time ◽  
Coarse Grained ◽  
Large Heat ◽  
Inclusion Level ◽  
Toughness Improvement

The toughness property of the coarse grained heat affected zone had become much worse since the large heat input welding was applied in HSLA for improving welding efficiency and reducing welding costs. Unlike previous investigations of the decreasing fracture toughness with heating time, the toughness of coarse grained heat affected zone increases in long heating time. Based on microstructure and mechanical properties, very remarkable impact toughness was obtained when the t8/5 was 80 s: toughness of 171 J. The toughness improvement initiates not from inclusions but directly from the microstructure of substrate. The microstructure type and inclusion level will compete to dominate the toughness of the 5% Ni steel.

Research on Performance Evaluation of Finance Transportation Projects Based on Fuzzy Neural Network

2014 ◽  
Vol 667 ◽  
pp. 60-63
Author(s):  
Wei Guo ◽  
Zhen Ji Zhang
Keyword(s):  
Neural Network ◽  
Performance Evaluation ◽  
Set Theory ◽  
Evaluation System ◽  
Fuzzy Neural Network ◽  
Expert Knowledge ◽  
Highway Projects ◽  
Performance Evaluation System ◽  
Transportation Projects ◽  
Fuzzy Neural

A performance evaluation system of finance transportation projects is mainly researched, in which the sub-module of the highway projects evaluation, waterway projects evaluation, Passenger stations projects evaluation, Energy saving projects evaluation are incorporated. In addition, the expert knowledge are inserted in the system, the multi-layer neural network and fuzzy-set theory are used to implement Performance Evaluation system of Finance invest Transportation Projects, and the feasibility and effectiveness of the evaluation system are finally verified by practice.

Super efficiency SBM-DEA and neural network for performance evaluation

2021 ◽  
Vol 58 (6) ◽  
pp. 102728
Author(s):  
Kaiyang Zhong ◽  
Yifan Wang ◽  
Jiaming Pei ◽  
Shimeng Tang ◽  
Zonglin Han
Keyword(s):  
Neural Network ◽  
Performance Evaluation ◽  
Super Efficiency
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