Fracture Failure Performance of 35VB Steel High-Strength Bolts Used in Subtropical Humid Climate

2021 ◽  
Vol 33 (12) ◽  
Author(s):  
Juan Wen ◽  
Lin Chen ◽  
Xu Duan ◽  
Jian Yang ◽  
Qingcai Liu ◽  
...  
Keyword(s):  
High Strength ◽  
Humid Climate ◽  
Fracture Failure

Fracture Analysis of Pipe Sleeve on Extrusion Flare-Less Pipe Joints for Aircraft Hydraulic Pipe

2011 ◽  
Vol 291-294 ◽  
pp. 1087-1090 ◽  
Author(s):  
Feng Mei Xue ◽  
Fu Guo Li ◽  
Jiang Li ◽  
Wen Jun Yu ◽  
Jian Fei Li
Keyword(s):  
Stainless Steel ◽  
Shear Stress ◽  
Stress Concentration ◽  
High Strength ◽  
Fracture Analysis ◽  
Forming Process ◽  
Fracture Failure ◽  
Δ Ferrite ◽  
Pipe Joints ◽  
Bearing Behavior

The forming process of aircraft hydraulic pipe joints is investigated through experiments and analyses to solve the cracking problem of pipe sleeve on extrusion flare-less pipe joints. It can be concluded that the internal cause of the fracture failure is connected with the content, shape and distribution of δ-ferrite in 0Cr12Mn5Ni4Mo3Al high strength stainless steel, and the external cause is associated with the bearing behavior in the extrusion-bulging process of pipe sleeve. The crack is formed in the criss-crossing section of δ-ferrite on the function of shear stress in the stress concentration position, which belongs to ductile deformed crack. It eventually induces the intergranular fracture of pipe sleeve along the long axis with the expanding of subsequent crack.

scholarly journals Stress corrosion cracking behavior of 20MnTiB high-strength bolts in simulation of humid climate in Chongqing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lin Chen ◽  
Juan Wen ◽  
Luyu Zhang ◽  
Zheng Li ◽  
Guangwen Li ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Steel Structure ◽  
High Strength ◽  
Atmospheric Environment ◽  
Safe Operation ◽  
Humid Climate ◽  
Cracking Behavior ◽  
High Strength Bolt ◽  
Corrosion Experiment ◽  
Effects Of Temperature

Abstract20MnTiB steel is the most widely used high-strength bolt material for steel structure bridges in China, and its performance is of great significance to the safe operation of bridges. Based on the investigation of the atmospheric environment in Chongqing in recent years, the corrosion solution to simulate the humid climate of Chongqing was designed in this study, and the stress corrosion experiment of high-strength bolts in the simulated humid climate of Chongqing was carried out. The effects of temperature, pH and concentration of simulated corrosion solution on the stress corrosion behavior of 20MnTiB high-strength bolts were studied.

Analysis on Fiber Laser Welding of MS1470 Steel

2011 ◽  
Vol 328-330 ◽  
pp. 487-491
Author(s):  
Ya Jie Li ◽  
Li Jun Xin ◽  
Zhi Yong Wang
Keyword(s):  
Automotive Industry ◽  
Low Cost ◽  
Welding Process ◽  
High Strength ◽  
Fracture Morphology ◽  
Rolling Process ◽  
Light Weight ◽  
Lower Intensity ◽  
Fiber Laser Welding ◽  
Fracture Failure

MS1470 steel is mainly used in the automotive industry, which has high strength, light weight and low cost. However, there always appear grains coarsening, brittle increasing, lower intensity and other issues. To solve this problem, we have analyzed the welding process, the fracture morphology and microstructure etc. The results shown that the microstructure were mainly ferrites and lath martensites. However, grains coarsening in the HAZ were serious, and fracture failure also occurred in the heat affected zone. Meanwhile, MS1470 steel had formed a small amount of pores during rolling process, which also is an important reason for cracks formation.

scholarly journals Stress Corrosion Cracking Behavior of 20MnTiB High-Strength Bolts in Simulation of Humid Climate in Chongqing

2021 ◽  
Author(s):  
Lin Chen ◽  
Juan Wen ◽  
Luyu Zhang ◽  
Zheng Li ◽  
Guangwen Li ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Steel Structure ◽  
High Strength ◽  
Atmospheric Environment ◽  
Safe Operation ◽  
Humid Climate ◽  
Cracking Behavior ◽  
High Strength Bolt ◽  
Corrosion Experiment ◽  
Effects Of Temperature

Abstract 20MnTiB steel is the most widely used high-strength bolt material for steel structure bridges in China, and its performance is of great significance to the safe operation of bridges. Based on the investigation of the atmospheric environment in Chongqing in recent years, the corrosion solution to simulate the humid climate of Chongqing was designed in this study, and the stress corrosion experiment of high-strength bolts in the simulated humid climate of Chongqing was carried out. The effects of temperature, pH and concentration of simulated corrosion solution on the stress corrosion behavior of 20MnTiB high-strength bolts were studied.

scholarly journals Structural and Thermal Performance Assessment of Shipping Container as Post-Disaster Housing in Tropical Climates

2021 ◽  
Vol 7 (8) ◽  
pp. 1437-1458
Author(s):  
Richelle G. Zafra ◽  
John Rheynor M. Mayo ◽  
Patrick Jasper M. Villareal ◽  
Victor Mikael N. De Padua ◽  
Ma. Hazel T. Castillo ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Thermal Condition ◽  
High Strength ◽  
Strong Wind ◽  
Single Family ◽  
Humid Climate ◽  
Element Analysis ◽  
Disaster Victims ◽  
Alternative Housing ◽  
Hot And Humid Climates

Shipping Containers (SC) are a viable option as temporary or permanent housing for disaster victims due to their modularity, strength, and availability in large quantities around the world. While SCs as alternative housing has been extensively explored, few studies have focused on the structural and thermal performance of SCs in a tropical monsoon climate. This paper aims to contribute to a better knowledge of SC building construction by (1) investigating the SCs structural performance when subjected to a variety of loads, including gravity, earthquake, and very strong typhoon, and (2) assessing the thermal performance in a hot and humid climate. The case of Leyte, Philippines, a hot, humid, and typhoon-frequented region, is considered in this study. To meet the objectives, two SCs were combined to build a single-family house. First, the structural strength of the SCs, including the effect of cuts and openings, were investigated using finite element analysis. Second, the thermal condition of the SC was compared using four models with different insulation materials: no insulation, PE foam insulation (R-12), slightly higher insulation (R-13 fiberglass batt), and very high insulation (R-49 fiberglass batt) through building energy simulation. The paper concludes that SCs have inherently high strength and can withstand strong wind and earthquake. Stresses due to cuts and openings were minimized when the cuts/openings were placed far from the corner posts. On the other hand, increasing insulation R-value did not improve the indoor thermal condition of the SCs. More work needs to be done on making SCs thermally comfortable in hot and humid climates. Doi: 10.28991/cej-2021-03091735 Full Text: PDF

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

The Nature of Delta Phase Precipitation in Inconel 718

1982 ◽  
Vol 40 ◽  
pp. 724-725
Author(s):  
L. S. Lin ◽  
C. C. Law
Keyword(s):  
Inconel 718 ◽  
Base Alloy ◽  
High Strength ◽  
Physical Metallurgy ◽  
Nickel Base Alloy ◽  
Phase Precipitation ◽  
Weight Percentage ◽  
Delta Phase ◽  
The Subject ◽  
Nickel Base

Inconel 718, a precipitation hardenable nickel-base alloy, is a versatile high strength, weldable wrought alloy that is used in the gas turbine industry for components operated at temperatures up to about 1300°F. The nominal chemical composition is 0.6A1-0.9Ti-19.OCr-18.0Fe-3Mo-5.2(Cb + Ta)- 0.1C with the balance Ni (in weight percentage). The physical metallurgy of IN 718 has been the subject of a number of investigations and it is now established that hardening is due, primarily, to the formation of metastable, disc-shaped γ" an ordered body-centered tetragonal structure (DO2 2 type superlattice).

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