We know, stainless steel furniture because of its practicality, durability and other characteristics by the various consumer favorite, it can be said that the development of stainless steel has its own characteristics, and characteristics to meet the need.The most important characteristics of the stainless steel is a corrosion resistance, but it is not only having corrosion resistance, but also has unique mechanical properties (yield strength, tensile strength, creep strength, high temperature strength, low-temperature strength, etc.), physical properties (density, than the heat capacity, coefficient of linear expansion, thermal conductivity, electrical resistivity, magnetic permeability, the elastic coefficient, etc.), process performance (formability, weldability, machinability, etc.) and metallurgical (phase composition, organizational structures, etc.), etc. .For these properties are important today mainly to look at the impact resistance of stainless steel furniture and high-temperature fatigue performance.
Stainless steel material under impact loads, load deformation curve including the area known as impact toughness.For casting maraging stainless steel, when the nickel content of 5% lower its impact toughness.With the increase in the nickel content, the strength and toughness of the steel can be improved, but the nickel content is greater than 8%, the strength and toughness values ??again declined.Martensitic chromium nickel-based stainless steel add molybdenum, can improve the strength of steel toughness and can remain unchanged.
To increase the content of molybdenum in the ferritic stainless steel may improve the strength, but the notch sensitivity is also improved so toughness decreased.Has a stable austenite in the austenitic stainless steel and chrome-nickel-based austenitic stainless steel toughness (at room temperature toughness and low temperature toughness) is very good, and is thus suitable for use at room temperature and low temperatures in various environments. .For stable austenite and Cr-Mn austenitic stainless steel.Addition of nickel can be further improved the toughness.The impact toughness of duplex stainless steel increased with increasing nickel content.Generally, in the two phase region of a + r impact toughness stable in the range of 160-200J.
The high-temperature fatigue refers to the material at high temperatures due to cyclic changes in the role of stress and damage to the fracture process.Its results indicate that the 10 eight times the power of the high-temperature fatigue strength is in a high temperature, the temperature of high-temperature tensile strength of 1/2.
Thermal fatigue during the heat (expansion) and cooling (contraction) of the process, when the temperature is changed by the binding from the outside, in the inside of the material corresponding to its own expansion and contraction deformation stress is generated, and the material damage.With shock resistance when quickly repeated heating and cooling the stress, the generated stress and usually greater than some materials, the brittle failure.This phenomenon is known as tie impact.Thermal fatigue and thermal shock phenomenon, but has similarities of the former is mainly associated with a large plastic strain, while the destruction of the latter is mainly brittle failure.
Stainless steel composition and heat treatment conditions affect the high-temperature fatigue strength.Temperature fatigue strength is significantly improved, especially when the carbon content increases, the solution heat treatment temperature also have a significant impact.In general, the ferritic stainless steel has good thermal fatigue performance.In austenitic stainless steels, high silicon and at high temperatures with good extension of grades have a good thermal fatigue properties.
The smaller the coefficient of thermal expansion, the smaller should be in the same thermal cycle under the action variable, the smaller the deformation resistance, and the higher the breaking strength, longer life.It can be said that the fatigue life of martensitic stainless steel 1Cr17 longest 0Cr19Ni9 the like 0Cr23Ni13 and 2Cr25Ni20 austenitic stainless shortest fatigue life.In addition the castings than Forgings are more likely due to the damage caused by thermal fatigue.At room temperature, the 7 th power of 10 times of fatigue strength is the tensile strength of 1/2.Shows that within the temperature range from room temperature to a high temperature fatigue strength is not much difference as compared with the fatigue strength at high temperatures.
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