Examining microstructure of industrial brass blanks with purpose for quality control in respect of defects of technological origin

G A Tkachuk,O A Chikova,V A Maltsev

doi:10.1088/1755-1315/87/9/092027

Abstract

The microstructure of industrial blanks made of brass L63 and L68 was examined for quality control. Exogenous inclusions and pores in the microstructure of blanks were found. The microstructure was examined by means of traditional metallographic analysis methods. The authors investigated the transition from exogenous inclusions and pores, which were not removed at the initial processing stage, to the crack, which leads to billet destruction at one of the last processing stages. A conclusion was made about the need for quality control brass blanks by metallographic method. Without quality control it is impossible to provide guarantee of reliable operation of machines and responsible purpose constructions.

Highlights

Brasses L63 and L68 have good strength and corrosion resistance, their structure and properties are a function of zinc content
Brass L63 contains a small amount of β-phase. α-copper is the primary phase in cast alloys containing up to 40% zinc. β - phase, which is the high zinc phase, is the minor constituent filling in the areas between dendrites of α-phase
The microstructure of ingots and billets for pressing and rolling made of brass L63 and L68 was examined for quality control

Summary

Introduction

Brasses L63 and L68 have good strength and corrosion resistance, their structure and properties are a function of zinc content. Α-copper is the primary phase in cast alloys containing up to 40% zinc. The microstructure of brasses containing up to 40% zinc consists of dendrites of α-phase and β-phase surrounding the dendrites. Cast alloys with greater than 40% of zinc contain primary dendrites of the β-phase. Brass L68 is a single phase alloy, consisting of a solid solution of zinc in α-copper. Brass L68 is characterized by high strength and ductility, so brass L68 processed by pressure without heating. Brass L68 is characterized by higher strength and ductility, so brass L68 is processed by pressure without heating. The strength and ductility of Cu-Zn alloys becomes bigger with increasing zinc content. Brasses containing between 32 and 39% zinc have a two phase structure, composed of α and β phases

Methods

Results

Conclusion