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Material Factors Analysis of the Cracking in 0Cr12Mn5Ni4Mo3Al Stainless Steel Pipe Sleeve on Aircraft Flare-less Pipe Joints Fuguo Li1, 2, a, Fengmei Xue1, b, Wenjun Yu3, c and Jianfei Li3, d 1School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China 2State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China 3Department of Manufacturing Engineering, Chengdu Aircraft Industry (Group) Limited Company, Chengdu, Sichuan, 610092, China afuguolx@163.com, bxfm-2002@sohu.com, cywenjun_2005@yahoo.com.cn, dliaddy2002@yahoo.com.cn Keywords: 0Cr12Mn5Ni4Mo3Al, Cr/Ni Equivalent Ratio, Ferrite, Microstructure, Fracture Analysis Abstract.
The material has good shaping and welding properties, which is appropriate for manufacturing aerocraft members, elastic elements working below 350˚C, through proper cold deformation, cold treatment and aging treatment.
However, the mechanical properties of 0Cr12Mn5Ni4Mo3Al high strength stainless steel are susceptible to the compositions and microstructures.
The mechanical properties of 0Cr12Mn5Ni4Mo3Al are stable when it is as macro-rod, flat steel and strip steel, but it is equal to a thin-walled pipe which is easy to cause fracture when it is processed into pipe sleeve form billet.
The higher hot working temperature will produce many ferrites, and the increase of ferrite will form lath-shaped textures, which distribute along the austenite grain boundary and affected by the recrystallization process.

The size of plastic zone on the tip of fatigue crack was determined by Suzuki using optical microscopy, which is compared to the results obtained from the stress intensity factor and finally pointed out that the crack growth rate is affected by plastic zone of the crack tip.
The material properties used in analysis of specimen is given in Table 1 reference to [8].
Table 1 Physical and mechanical properties of materials [8].
The grain-boundary geometry could be one of the key factors that control the short fatigue crack retardation process at the boundary since a stage-I short fatigue crack normally propagated along the favored slip plane within a grain in many metallic materials.
Zhai has proposed a model and show that the twist and tilt angles of the crack-plane deflection at a grain boundary are the key factors that control the path and growth rate of a short crack.

And the effects of these factors on its performance were tested from the cubes with side length of 70.7mm which had been cured in 80±2ºC hot water for 48 h.
Water is one of the most essential requirements to the hydration reaction of cement, and water- binder ratio is a key index which reflects the density of cement-based materials, it’s also one of the most important factors that affects the mechanical and construction performance of grouts.
Research on the Properties of Modified Cement Based Grouting Material Based on DSP Principle.
Influence of Curing Condition on the Properties of Concrete at Early Ages.
Research on the Comprehensive Properties of Early-strength and High-strength Grouting materials Based on DSP Principle.

In this paper, the three-dimensional molding mechanical and electrical integration unit Molded Interconnect Devices (MID) is introduced.
The three dimensional compression molding mechanical and electrical integration unit (MID) will be one item face future technology, will be the circuit design and the mechanical and electrical products design[2]An emerging domain, may reduce system's order of complexity, reduce the system power loss, to enhance the system integration rate and the reliability.
So the electromagnetic wave signal is very difficult to penetrate the outer covering, thus affecting the interconnection intercommunication the effect.
It besides needs to consider this unit mechanical property and the electric circuit performance in the three-dimensional space integration[3], but also needs the overall evaluation material special performance, the formation processing, etching galvanization aspect and so on processing craft and complex spatial assembly factors.
Regardless of the traditional RFID or the intelligence embedded technology, to design and the manufacture the IOT[7] ciucuit with thses technologies, will face how to connect the outside antenna and the intelligent chip, which will not affect the radio signal acceptance and transmits.

The properties of coatings received by means of a vacuum arc method are considered.
At the second stage coating which properties are defined by heating temperature of a processed surface is created.
Mathematical modeling of a vacuum arc discharge process is complicated because of multiple factors of the process as well as combined interrelation between different parameters (Fig. 1).
Content of drop fractions causes premature corrupting of coatings, corrosions and lowering of their operational properties.
Interrelation between parameters defining properties of formed nitride coatings For the synthesis of nitride compounds as a reaction gas chemically active molecular nitrogen with a strong triple bond is used.

This is because moisture significantly impacts the physical and mechanical properties of wood [2].
Its physical and mechanical properties.
It has moderate physical-mechanical properties (bulk mass 630-790 kg/m3).
Its mechanical properties are lower than Pine.
Yamaguchi, Prediction of mechanical properties by means of semi-destructive methods: A review.

The physical (smoothness and thickness of film) and mechanical properties (tensile strength and elongation at break) of latex film are still good.
They were subsequently characterized for the physical properties (i.e. thickness, film surface, color, and appearance), optical properties (i.e. clearance, crack-free), and mechanical properties (i.e. tensile strength, elongation at break, and tear resistance).
Because the SEM result of mangosteen-peel powder microstructure likes sharp thorn effect to increase or reinforce the mechanical properties of natural rubber latex gloves.
It can increase the mechanical properties such as tensile strength, elongation at break, and tensile stress.
Njopwouo, Effects of Some Processing Factors on Technical Properties of a Clay-Based Ceramic Material, Applied.

The crack initiation period depends on material properties.
Fracture properties can be expected to be controlled primarily by the degree of crystallinity, even though this parameter is just one of the many factors.
For polymer, the degree of crystallinity decided its mechanical properties.
The basic mechanical properties, sample dimension and other parameters must also be known at each testing temperature.
Especially the basic mechanical properties at different temperature and a mass of computation work don’t be needed.

Demagnetization curve and magnetic properties for the best obtained powder are presented in Fig. 6.
Properties vary depending on the processing conditions.
Obtained properties are slightly better than presented in [8] and [9], where achieved properties were as follows: (BH)max of 46 kJ/m3 (worse), Mr 0,55 T (worse), Hci 750 kA/m (better) and (BH)max of 50 kJ/m3 (worse), Jr 0.58 T (worse) Hc 920 kA/m (better), respectively.
Magnetic properties of recycled powder (demagnetizing curve).
Final powder properties are determined by many factors, including chemical composition of magnets, size of particles, processing parameters etc.

Effects of cement properties on stress distributions at the dentin-cement-post interfaces have been studied using 3D explicit finite element simulations.
The types of cement do not affect the failure initiation location on the cement.
The post related factors (modulus of elasticity, diameter and length) influence the stress fields occurred within the post [1] but the maximum stress values in the restored tooth system are rather insensitive to post materials [2].
The detailed description of the finite element modeling, selected material properties, loading description and dimension of the tooth are given in [7].
This relatively low stress is due to the lower stiffness property of the orthotropic post (modulus in fiber direction = 44 GPa).