4032 alloy alterant and use method thereof

Abstract

The invention relates to a 4032 alloy alterant and a use method thereof; the alterant comprises an Al-P and Al-5Ti-B intermediate alloy, and the following components in percentage by weight: P: 0.028 to 0.056 percent, Ti: 0.01 to 0.07 percent, B: 0.002 to 0.014 percent, and the balance aluminum. The essentials of the use method thereof are as follows: after the 4032 alloy is initially refined, Al-3.5 percent P alterant which is 0.6 to 1.6 percent of the ingredient weight of the 4032 alloy is added in at 750 to 850DEG C, to be uniformly stirred, and the heat is insulated for 15 to 100min; the materials are refined again; and Al-5Ti-B which is 0.3 to 1.6 percent of the weight of the 4032 alloy is added in at 750 to 770DEG C, and the heat is insulated for 5 to 12min. The alterant and the use method thereof can refine the primary crystal silicon to 18mu m before the thermal processing and the heat treatment of the 4032 alloy, and the nodularity is higher than 50 percent, and the mechanical property is greatly improved. The invention realizes the effective metamorphism of the 4032 alloy, and simultaneously develops a novel idea for the metamorphic technology of Al-Si eutectic alloys.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a modifier for 4032 aluminum alloy and its application method. Background technique [0002] Aluminum-silicon alloy has high strength, high wear resistance, low expansion coefficient, and good casting performance, and has broad application prospects in machinery industry, automobile industry, aviation and military industry. The main constituent elements of 4032 alloy are Al, Si, Cu, Mg, Ni, with an average silicon content of 12.2%, which is close to the eutectic point of the aluminum-silicon phase diagram, and is a near-eutectic aluminum-silicon alloy. 4032 alloy not only has the characteristics of cast aluminum alloy, but also has the characteristics of deformed aluminum alloy. It is often used to process forgings and forging billets, and is used as a wear-resistant material for making pistons and other parts that work at high temperatures. In the unmodified 4032 alloy, the primary si...

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Problems solved by technology

However, Al-P can only refine the primary silicon and make it polygonal, and the spheroidization effect is not obvious

The master alloy containing titanium and boron is often used as a grain refiner, which is added to the launder in the final stage of smelting, and it is rarely used as a modifier to cooperate with the Al-P master alloy to modify the primary silicon. Chinese patent CN101058855A reports a The hypereutectic aluminum-silicon alloy fiber structure refinement process method first adds a Ti-containing grain refiner, and then adds a phosphorus modifier (powder) to refine the primary silicon. CN1861820A reports a method composed of Cu-P and Thin ribbon-shaped modifier prepared by Al-5Ti-B master alloy and its application method, "Special Casting and Nonferrous Alloys" 2006, Volume 26, Issue 5 reported that Liu Xiangfa of Shandong University and others used 0.8% Al-P and 0.1-0.2 % Al-5Ti-B modified ZL109 alloy at 780 °C, and achieved a good modification effect on primary silicon, but the specific process was not introduced in detail, and when Al-5Ti-B was added to keep 780 °C unchanged, there was no The temperature of the furnace is adjusted by adding different modifiers. The above reports have refined the primary silicon, but the spheroidization effect is not obvious.

At present, there are few studies on the modification of 4032 alloy. Without subsequent deformation and heat treatment, the primary silicon is refined to less than 18 μm and more than 50% spheroidized by adding P and other modifiers in the smelting stage. Modifier and its modification process have not been reported yet

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