scholarly journals COMPARATIVE ANALYSIS AND EFFICIENCY ASSESSMENT OF COMPLEX IMPACT ON QUALITY OF HEAVY CASE CASTINGS OF MEDIUM-ALLOYED HIGH-STRENGTH STEEL

2017 ◽  
Vol 60 (3) ◽  
pp. 223-229
Author(s):  
E. A. Chernyshov ◽  
A. D. Romanov ◽  
E. A. Romanova
Keyword(s):  
Comparative Analysis ◽  
High Strength Steel ◽  
High Strength ◽  
Efficiency Assessment

The Design and Size Optimization of the New FCEV Subframe Based on Hypermesh Platform

2011 ◽  
Vol 328-330 ◽  
pp. 435-440
Author(s):  
Jun Liao ◽  
Lan Shan ◽  
Yan Feng
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Finite Element Model ◽  
Mode Shape ◽  
High Strength Steel ◽  
High Strength ◽  
Element Model ◽  
Strength Analysis ◽  
Size Optimization ◽  
Optimal Size

The establishment of FCEV finite element model of the subframe is based on Hypermesh platform, and a new subframe structure is designed in accordance with the stiffness and strength analysis on the original subframe in all conditions. High-strength steel materials are used to optimize the design of this new structure, which result in the optimal size. Through the comparative analysis of the strength, stiffness, mode shape and quality on new subframe and the original one, it is verified that the design of the new subframe is reasonable and feasible.

Study of the Prospects of the Use of High-Strength Steel Shapes

2013 ◽  
Vol 475-476 ◽  
pp. 1253-1256
Author(s):  
Valentina Parlashkevich ◽  
Oleg Tsyba
Keyword(s):  
Comparative Analysis ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Structural Elements ◽  
Steel Shapes ◽  
Economic Indices

The prospects of the use of rolled shapes made of high-strength steels in steel structural elements are considered. A comparative analysis of strength values and economic indices of steel structural elements is done for their work in compression, tension and bending.

Analysis of Causes for Cracking of Chinese Large High-Strength Steel Spheric Tank and Suggestion About Its Prevention

2007 ◽  
Author(s):  
Xuedong Chen ◽  
Rong Yuan ◽  
Bing Wang ◽  
Tiecheng Yang ◽  
Pingjin Li ◽  
...  
Keyword(s):  
Failure Analysis ◽  
High Strength Steel ◽  
Field Survey ◽  
High Strength ◽  
Fabrication Process

In recent ten years, a number of cracking cases were reported on the in-service high-strength steel spheric tank made of 07MnCrMoVR and 07MnNiCrMoVDR steels (CF-62 steel for short) which were developed in China independently. Based on field survey, actual vessel inspection and failure analysis, it is pointed out that the quality of the steels, the problems existing in design and fabrication process and incompleteness of relevant standards are the major cause of cracking. Recommendations for cracking prevention of the high-strength steel spheric tank made of Chinese CF-62 steel are proposed.

Key Technology to Reduce Residual Stress Level of High Strength Steel

2012 ◽  
Vol 572 ◽  
pp. 221-226
Author(s):  
Wen Hong Ding
Keyword(s):  
Residual Stress ◽  
Stress Level ◽  
High Strength Steel ◽  
Rolling Force ◽  
Technical Problem ◽  
High Strength ◽  
Improve Performance ◽  
Key Technology ◽  
Servo Valve

Given that the traditional hot temper passing process cannot fulfill the demand of high strength steel on residual stress level and stable processability, leveler and temper passing process with dual servo valve (LTP-DSV) is developed to solve this technical problem. LTP-DSV process employs leveler to reduce residual stress level of high strength steel; uses dual servo valve variable gain rolling force control technology to improve performance stability of high strength steel; improves surface quality of high strength steel by means of temper passing. The residual stress level of products is substantially reduced on condition that the performance of high strength steel is ensured. The actual production data shows LTP-DS process is able to improve the performance and quality of high strength steel from all aspects.

Influence of the smelting method on the quality of high-strength steel

Metallurgist ◽  
1972 ◽  
Vol 16 (11) ◽  
pp. 758-762
Author(s):  
M. I. Lobarev ◽  
Ya. I. Spektor ◽  
R. I. Griner ◽  
P. M. Gerashchenko ◽  
L. I. Shturgunov ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Smelting Method

Direct Punching in Inclined Ultra-High Strength Steel Sheets

2014 ◽  
Vol 622-623 ◽  
pp. 1051-1057 ◽  
Author(s):  
Yohei Abe ◽  
Ken Ichiro Mori ◽  
Shigehiro Nakanoshita ◽  
Purwo Kadarno
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Bottom Edge ◽  
Steel Sheets ◽  
Sheared Edge ◽  
Ultra High Strength Steel ◽  
Grade Steel ◽  
Inclined Sheet

A direct punching of inclined ultra-high strength steel sheets having low ductility was carried out to improve the quality of the sheared edge. In the direct punching of an inclined sheet, the contact between the sheet and punch became gradual because of touch from the bottom edge of the punch, and thus the sheared portion tended to bend in the latter half of punching. As the strength of the sheet increased, defects such as burr and secondary burnished surface were occurred around the sheared edge due to the low ductility. The range of direct punching for sheared edge without defects was shown for the high strength steel sheets. To prevent the occurrence of defects, a punch having inclined bottom was used. In this punch, the contact with the sheet was changed, the uniform contact with the inclined bottom was given. In the punch having the inclined bottom, the secondary burnished surface in the edge of 980 MPa grade steel sheet was prevented.

Fatigue Analysis of Multi-Lap Spot Welding of High Strength Steel by Quasi Static Tensile- Shear Test

2007 ◽  
Vol 345-346 ◽  
pp. 251-254
Author(s):  
Su Rok Sin ◽  
Sung Mo Yang ◽  
Hyo Sun Yu ◽  
Chai Won Kim ◽  
Hee Yong Kang
Keyword(s):  
Fatigue Life ◽  
High Strength Steel ◽  
Shear Test ◽  
Welding Current ◽  
High Strength ◽  
Tensile Shear ◽  
Life Evaluation ◽  
Static Tensile ◽  
Fatigue Life Evaluation

The welding quality of spot weldment is an important factor that significantly affects the strength, stiffness, safety, and other performance characteristics of vehicles. Therefore, quality control and fatigue life evaluation of spot weldment are necessary processes. This paper presents a method for determining the fatigue life of multi-lap spot weldment of a high strength steel sheet. In this method, the fatigue life is estimated by using the lethargy coefficient, which is the total defect coefficient according to rupture stress and time obtained by the quasi static tensile-shear test. Also, in this study, we modified the lethargy coefficient by using the welding current. And, we define a specific lapping constant, which is a characteristic constant of 2 or 3 lap weldments. The fatigue life obtained by the fatigue estimate equation, which contains a specific lapping constant was compared and verified with an experimental value. And we analyzed the relation of lap number, welding current and fatigue life. This method can save processing time and cost for predicting the life cycle of a structure.

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