Hastelloy is a nickel-based high-temperature alloy with excellent high-temperature strength and corrosion resistance. It is widely used in aerospace, petrochemical, nuclear energy and other fields. This paper discusses the influencing factors and improvement methods of the high temperature strength and corrosion resistance of Hastelloy alloys.
Ⅰ. Factors affecting high temperature strength
1. Selection and content of alloying elements: Alloying elements added to Hastelloy can affect its high temperature strength. Commonly added elements include molybdenum, chromium, titanium, aluminum, etc. These elements can form hard phases and enhance the high-temperature strength of the alloy. At the same time, the content of alloy elements will also affect the high-temperature strength of the alloy. Too high or too low content will affect the performance of the alloy.
2. Heat treatment process: The heat treatment process can affect the microstructure and grain size of Hastelloy alloy, thereby affecting the high temperature strength of the alloy. Different heat treatment processes will have different effects on alloys, such as solution annealing, aging treatment, etc.
3. Grain boundaries and phase boundaries: The grain boundaries and phase boundaries in Hastelloy can affect its high temperature strength. The chemical composition and structure at grain boundaries and phase boundaries affect the strength and plasticity of the alloy.
4. Temperature: The high-temperature strength of Hastelloy decreases as the temperature increases, so appropriate alloy materials need to be selected in high-temperature environments.
Ⅱ. Factors affecting corrosion resistance
1. Selection and content of alloying elements: The alloying elements added to Hastelloy not only affect its high-temperature strength, but also affect its corrosion resistance. For example, adding chromium can improve an alloy’s corrosion resistance, while adding molybdenum can improve its resistance to pitting corrosion. At the same time, the content of alloy elements will also affect the corrosion resistance of the alloy. Too high or too low content will affect the corrosion resistance of the alloy.
2. Type and concentration of corrosive media: Hastelloy has different corrosion resistance properties in different corrosive media. The higher the concentration of the corrosive medium, the greater the impact on the corrosion properties of the alloy.
3. Surface state of the alloy: The surface state of Hastelloy will affect its corrosion resistance. For example, defects and oxides on the surface can reduce the corrosion resistance of the alloy.
4. Temperature and pressure: Hastelloy has different corrosion resistance under different temperatures and pressures. Normally, high temperature and high pressure environments will accelerate the corrosion of alloys.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 2001 with a registered capital of 16.8 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Sep-02-2023
