Composition and Properties of Nickel-based Alloys

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Gold is a high-quality hedge hedging tool, favored by investors. Especially in recent years, with the increasing instability of the world economy, gold has become one of the preferred asset allocations of investors because of its functions of hedging and fighting inflation.

Earlier, the worsening situation in Ukraine sent gold prices soaring to a two-year high of $2,070 an ounce. But gold, along with other commodities, fell back last week as conditions changed and bulls took profits, hitting a low of $1,895 an ounce. As of press time, gold was trading at $1,918 an ounce, down 7.9% from its March 8 peak. Rising gold prices may also have an impact on the Inconel 625 powder prices.

According to China Business News, Goldman Sachs raised its gold price forecast in early March, considering Asian buyers' gold consumption demand, investment demand and central bank gold purchase demand continue to rise. Three -, six - and 12-month targets were raised to $2,300, $2,500 and $2,500 an ounce, respectively, from $1,950, $2,050 and $2,150. The last time all three accelerated was in 2010-11 when gold prices rose nearly 70%.

The World Gold Council has also noted that global gold demand is at its highest level in nearly two years, which is linked to a recovery in consumption and consumer sentiment to combat inflation. 

What is a nickel-based alloy?

Nickel-based alloys refer to a class of alloys that have high strength and a certain degree of oxidation and corrosion resistance at a high temperature of 650 to 1000 ℃.

According to the main properties, it is divided into nickel-based heat-resistant alloys, nickel-based corrosion resistant alloys, nickel-based wear-resistant alloys, nickel-based precision alloys and nickel-based shape memory alloys.

According to the different substrates, superalloys are divided into iron-based superalloys, nickel-based superalloys and cobalt-based superalloys. Among them, nickel-based superalloys are referred to as nickel-based alloys.

Representative materials of nickel-based alloys are:

1. Incoloy alloy, such as Incoloy800, the main component is: 32Ni-21Cr-Ti, Al; it is a heat-resistant alloy;

2. Inconel alloy, such as Inconel600, the main component is; 73Ni-15Cr-Ti, Al; it is a heat-resistant alloy;

3. Hastelloy alloy, namely Hastelloy alloy, such as Hastelloy C-276, the main component is: 56Ni-16Cr-16Mo-4W; it belongs to corrosion-resistant alloy;

4. Monel alloy, namely Monel alloy, such as Monel 400, the main component is; 65Ni-34Cu; belongs to the corrosion-resistant alloy;

Composition and properties of nickel-based alloys

Nickel-based superalloys are the most widely used. The main reason is that, firstly, more alloying elements can be dissolved in the nickel-based alloy, and good structure stability can be maintained; secondly, a coherent and ordered A3B-type intermetallic compound γ[Ni3(Al, Ti)] can be formed. As a strengthening phase, the alloy is effectively strengthened, and higher high temperature strength is obtained than iron-based superalloys and cobalt-based superalloys; third, nickel-based alloys containing chromium have better oxidation and resistance than iron-based superalloys Gas corrosion ability.

Nickel-based alloys contain more than ten elements, of which Cr mainly plays an anti-oxidation and anti-corrosion role, and other elements mainly play a strengthening role. According to their strengthening action mode, they can be divided into: solid solution strengthening elements such as tungsten, molybdenum, cobalt, chromium and vanadium; precipitation strengthening elements such as aluminum, titanium, niobium and tantalum; grain boundary strengthening elements such as boron, zirconium, Magnesium and rare earth elements, etc.

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