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51313-02157-The Stress Corrosion Cracking Susceptibility of Ti-6Al-4V Alloy in Presence of Hot Salt

Picture for The Stress Corrosion Cracking Susceptibility of Ti-6Al-4V Alloy in Presence of Hot Salt
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Product Number: 51313-02157-SG
ISBN: 02157 2013 CP
Author: Mangesh Pustode
Publication Date: 2013
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Titanium based alloys have good ambient temperature corrosion resistance combined high specific strength but they suffer from hot salt stress corrosion cracking (HSSCC) when exposed to halides in the temperature range of 260 to 480 °C. Literature on these alloys in relation to HSSCC is scanty even though this work was started during early 70s. Hence this work is undertaken in the present work.

The slow-strain-rate test technique was used to evaluate the susceptibility of Ti-6Al-4V alloy to hot salt stress corrosion cracking (HSSCC) which is a candidate material for various compressor components in marine gas turbine.


The strain rate used was 1.7 x 10-6 s-1. Gage section of the cylindrical tensile sample was dip coated with 25 wt. % NaCl solution. NaCl salt film formed on the specimen was in the range of 0.3 – 0.5 mg/cm2. The bare and salt coated samples were subjected to slow strain rate tests in the temperature range of 150 – 450 °C.


Stereographic images showed that the secondary cracks were observed at 250 °C and above. Also the crack length on the fractured section and number of the cracks along gage section increased with the temperature. Fractographic analysis using scanning electron microscopy (SEM) reveals stress corrosion cracking initiation on specimens at 250 °C. At 400 and 450 °C test temperatures a clear indication of the presence of secondary crack between equiaxed alpha and lamellar alpha-beta was also observed. The study indicates that the hot salt stress corrosion cracks initiate at 250 °C and the susceptibility significantly increases with increase in temperature.


Keywords: Hot salt stress corrosion cracking slow strain rate test Ti-6Al-4V alloy
 

Titanium based alloys have good ambient temperature corrosion resistance combined high specific strength but they suffer from hot salt stress corrosion cracking (HSSCC) when exposed to halides in the temperature range of 260 to 480 °C. Literature on these alloys in relation to HSSCC is scanty even though this work was started during early 70s. Hence this work is undertaken in the present work.

The slow-strain-rate test technique was used to evaluate the susceptibility of Ti-6Al-4V alloy to hot salt stress corrosion cracking (HSSCC) which is a candidate material for various compressor components in marine gas turbine.


The strain rate used was 1.7 x 10-6 s-1. Gage section of the cylindrical tensile sample was dip coated with 25 wt. % NaCl solution. NaCl salt film formed on the specimen was in the range of 0.3 – 0.5 mg/cm2. The bare and salt coated samples were subjected to slow strain rate tests in the temperature range of 150 – 450 °C.


Stereographic images showed that the secondary cracks were observed at 250 °C and above. Also the crack length on the fractured section and number of the cracks along gage section increased with the temperature. Fractographic analysis using scanning electron microscopy (SEM) reveals stress corrosion cracking initiation on specimens at 250 °C. At 400 and 450 °C test temperatures a clear indication of the presence of secondary crack between equiaxed alpha and lamellar alpha-beta was also observed. The study indicates that the hot salt stress corrosion cracks initiate at 250 °C and the susceptibility significantly increases with increase in temperature.


Keywords: Hot salt stress corrosion cracking slow strain rate test Ti-6Al-4V alloy
 

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