The technology of powder production from grinding sludge of high-temperature steel 40Kh10S2M is developed. It is shown that processing the grinding sludge of steel 40Kh10S2M in a ball grinder at 60 to 80°C for one hour with subsequent washing with detergents, magnetic separation, and annealing in a restorable medium produces powder with satisfactory technological characteristics. In this processing, the consumption of detergents is decreased, water can be recycled, and extracted oil is sent for recycling. The powder can be densified by adding a plasticizer (polyvinyl alcohol) and granulating the mixture. The technology permits producing compacts with a density of 5.6 to 5.8 g/cm 3 at pressure of 800 MPa. The powder is recommended as a raw material for powder metallurgy.Producing a metal powder is an initial operation in powder metallurgy. The expediency of a production method depends on the economic evaluation of the entire process. Production of powders from waste [1, 2], that permits higher effectiveness of part production technologies and solution of ecological problems, is becoming more popular. The paper [3] has established that sludge of high-temperature steel 40Kh10S2M resulting from grinding car valves can be processed into a powder suitable for use in powder metallurgy. Sludge processing includes the following operations: washing to remove lubricating coolant and oil, dehydration, drying, magnetic separation, and annealing in producer gas. The powder produced with this technology has the following properties: bulk density in vibration filling of 1.17 g/cm 3 ; zero fluidity in testing according to GOST 20899-75; compactability (according to GOST 25280-82) in vibration filling of the powder into the matrix and pressure of 800 MPa no more than 5.47 to 5.50 g/cm 3 . However, cracks form on compacts at this pressure. Note that unsatisfactory process properties of the powder (zero fluidity, small bulk density, low compactability and formability) almost exclude its use for pressing parts with automatic molds.In addition, vibration filling of the matrix should be used in manual pressing. The technology does not provide for recycling sludge treatment waste, especially water.This study is intended to improve the technology of powder production from sludge of steel 40Kh10S2M to ensure better properties of the powder.Grinding sludge of steel 40Kh10S2M contains 70% of metal fractions, 10% of nonmetal fractions (disintegration products of abrasive tools in grinding), and 20% of lubricating coolant [3]. More than 10 to 15% of the sludge are conglomerates of oxidized metal and nonmetal particles cemented by lubricating coolant. Metallographic analyses have established that the metal part consists of different chips: thin curly; oblong, curved (scimitar-shaped); and in the form of splintered particles (Fig. 1). The mean sizes of the chips are as follows: curly chips have 0.015 to 0.110 mm in thickness and 0.5 to 2.5 mm in length; oblong chips have 0.006 to 0.025 mm in thickness and 0.05 to 0.2 mm in length; splintered p...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.