Abstract
In this paper, the microstructure evolution and ultrasonic velocity variation of Ti6Al4V Ti-alloy bars under different conventional forging deformation degrees and triple heat treatment were investigated, it was found that the the orientation of microstructure is the main factor influencing the ultrasonic velocity. Meanwhile, taking the ultrasonic velocity as target, the ultrasonic velocity variation under given conventional forging process combined with different triple heat treatment conditions (heating temperatures, holding time) were revealed, it was found that the α-β phase ratio, the volume fraction and morphology of equiaxed αp and lamellar αs are also influencing the ultrasonic velocity.
Highlights
In this paper, the microstructure evolu on and ultrasonic velocity varia on of Ti6Al4V Ti-alloy bars under different conven onal forging deforma on degrees and triple heat treatment were inves gated, it was found that the the orienta on of microstructure is the main factor influencing the ultrasonic velocity
Ti6Al4V alloy is a typical (α+β) tanium alloy, possessing excellent comprehensive proper es such as high strength, high specific strength and good creep performance at high temperature, is extensively used to manufacture structural components in aerospace field, such as joints and frames[1].As a conven onal nondestruc ve tes ng method, ultrasonic tes ng applies a variety of physical and chemical phenomena to test without damaging the materials, so as to evaluate the physical proper es, state and internal structure of the materials, and to determine whether or not they are qualified
To some extent, the proper es of the material are determined by the microstructure of the alloy, so there is a certain rela onship between the ultrasonic velocity value and the microstructure [4,5,6,7] The purpose of the present paper is to inves gate the microstructure evolu on and ultrasonic velocity varia on of Ti6Al4V Ti-alloy bars under different conven onal forging deforma on degrees, and to reveal the effect of triple heat treatment condi ons on the ultrasonic velocity varia on
Summary
Ti6Al4V alloy is a typical (α+β) tanium alloy, possessing excellent comprehensive proper es such as high strength, high specific strength and good creep performance at high temperature, is extensively used to manufacture structural components in aerospace field, such as joints and frames[1].As a conven onal nondestruc ve tes ng method, ultrasonic tes ng applies a variety of physical and chemical phenomena to test without damaging the materials, so as to evaluate the physical proper es, state and internal structure of the materials, and to determine whether or not they are qualified. By measuring the ultrasonic velocity of the material, the microstructure and proper es of the material can be detected and evaluated[2,3]. Ultrasonic velocity is a basic physical quan ty describing the propaga on characteris cs of ultrasonic wave in the medium, which is closely related to the material and the bonding force between material atoms and the atomic spacing. To some extent, the proper es of the material are determined by the microstructure of the alloy, so there is a certain rela onship between the ultrasonic velocity value and the microstructure [4,5,6,7] The purpose of the present paper is to inves gate the microstructure evolu on and ultrasonic velocity varia on of Ti6Al4V Ti-alloy bars under different conven onal forging deforma on degrees, and to reveal the effect of triple heat treatment condi ons on the ultrasonic velocity varia on
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