scholarly journals An analysis to optimize the process parameters of friction stir welded low alloy steel plates

2018 ◽  
Vol 5 (3) ◽  
pp. 25 ◽  
Author(s):  
A Pradeep ◽  
S Muthukumaran
Keyword(s):  
Alloy Steel ◽  
Process Parameters ◽  
Steel Plates ◽  
Low Alloy Steel ◽  
Friction Stir

Effect of D/TP ratio on stir zone characteristics of friction stir-welded high-strength low-alloy steel plates

2016 ◽  
Vol 232 (10) ◽  
pp. 829-840 ◽  
Author(s):  
S Ragu Nathan ◽  
V Balasubramanian ◽  
S Malarvizhi ◽  
AG Rao
Keyword(s):  
Alloy Steel ◽  
Plate Thickness ◽  
High Strength ◽  
Steel Plates ◽  
Low Alloy Steel ◽  
Microstructural Characteristics ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Shoulder Diameter ◽  
Superior Mechanical Properties

In this study, the effect of tool shoulder diameter (D) to the plate thickness (Tp) ratio on tensile and impact toughness properties of friction stir-welded naval grade high-strength low-alloy steel was investigated. A naval grade high-strength low-alloy steel of 5 mm thick plates was welded with tool rotational speed of 600 r/min and welding speed of 30 mm/min using tungsten-based alloy tools having D/Tp ratio varying from 4 to 6. Microstructural characteristics of the weld joints were analyzed using optical microscopy and scanning electron microscopy with energy dispersive spectroscopy along with the evaluation of tensile properties. From this investigation, it was found that the joint fabricated using a D/Tp ratio of 5 (25 mm shoulder diameter) exhibited superior mechanical properties compared to other joints.

scholarly journals Rolling and Heat Treatments of Heavy Section Low Alloy Steel Plates

1976 ◽  
Vol 62 (13) ◽  
pp. 1708-1719 ◽  
Author(s):  
Hitoji NAKAO ◽  
Ryota YAMABA ◽  
Itaru AOKI ◽  
Tsuguyuki KAWAI ◽  
Hidesato MABUCHI ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Heat Treatments ◽  
Steel Plates ◽  
Low Alloy Steel ◽  
Heavy Section

Study of Low Carbon Low Alloy Steel Annealing Process Parameters Optimization

2013 ◽  
Vol 631-632 ◽  
pp. 649-659
Author(s):  
Mao Yu Zhao ◽  
Qian Wang Chen
Keyword(s):  
Yield Strength ◽  
Alloy Steel ◽  
Process Parameters ◽  
Orthogonal Experiment ◽  
Annealing Process ◽  
Parameters Optimization ◽  
Grey Theory ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Sem Images

A suitable match of annealing process parameters is critical for obtaining the fine microstructure of material. Low carbon low alloy steel (20CrMnTi) was heated for various durations near Ac temperature to achieve fine pearlite and ferrite grains. Annealing temperature and time were used as independent variables, and material property data were acquired by orthogonal experiment under intercritical annealing followed by subcritical annealing process (IASAP). The weights of plasticity (hardness, yield strength, section shrinkage, and elongation) of annealing material were calculated by analytic hierarchy process, and then the process parameters were optimized by using the grey theory system. The results observed by SEM images show that the optimized material microstructure consists of refining and distributing uniformly ferrite-pearlite grains, and smaller lamellar cementites. Morphologies on tension fracture surface of the optimized material indicates that the numbers of dimple fracture show more finer toughness obviously comparing with other annealing materials. Moreover, the yield strength value of the optimized material decreases apparently measured by tensile test. Thus, the new optimized strategy is accurate and feasible.

Numerical Analysis of the Influence on High Humidity in a T-Joint Fillet Weld for High Strength Low Alloy Steel

2014 ◽  
Vol 651-653 ◽  
pp. 56-59
Author(s):  
Song Ping Chen ◽  
Yong Xian Li ◽  
Yan Ji Xie
Keyword(s):  
Residual Stress ◽  
Alloy Steel ◽  
Steel Structures ◽  
High Strength ◽  
Computational Procedure ◽  
Steel Plates ◽  
Transient Temperature ◽  
High Humidity ◽  
Low Alloy Steel ◽  
Port City

Welding at high humidity is frequently needed for the harbor hoisting machinery of steel structures in the coastal port city. A computational procedure is proposed for analyzing residual stress and temperature distributions induced by the T-joint welding in two types of St52-3 high strength low alloy steel plates both 6 mm in thickness. The relative humidity conditions varied from 75 to 90% at constant pressure. The finite element models are employed to evaluate the transient temperature and the residual stress during welding. According to the analysis results, the higher residual stress and the highest concentration of hydrogen are distributed in and surround the heat affected zone (HAZ), and vary with different humidity.

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