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Title of Journal: Metall and Mat Trans A

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Abbravation: Metallurgical and Materials Transactions A

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Springer US

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DOI

10.1016/0955-0674(92)90100-Q

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ISSN

1543-1940

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Effect of Application of Short and Long Holds on F

Authors: Vani Shankar K Mariappan R Sandhya M D Mathew T Jayakumar
Publish Date: 2013/11/14
Volume: 45, Issue: 3, Pages: 1390-1400
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Abstract

Modified 9Cr1Mo steel is a heattreatable steel and hence the microstructure is temperature sensitive During welding the weld joint WJ is exposed to various temperatures resulting in a complex heterogeneous microstructure across the weld joint such as the weld metal heataffected zone HAZ consisting of coarsegrained HAZ finegrained HAZ and intercritical HAZ and the unaffected base metal of varying mechanical properties The overall creep–fatigue interaction CFI response of the WJ is hence due to a complex interplay between various factors such as surface oxides and stress relaxation SR occurring in each microstructural zone It has been demonstrated that SR occurring during application of hold in a CFI cycle is an important parameter that controls fatigue life Creep–fatigue damage in a cavitationresistant material such as modified 9Cr1Mo steel base metal is accommodated in the form of microstructural degradation However due to the complex heterogeneous microstructure across the weld joint SR will be different in different microstructural zones Hence the damage is accommodated in the form of preferential coarsening of the substructure cavity formation around the coarsened carbides and new surface formation such as cracks in the soft heataffected zoneThe authors are thankful to Sri S C Chetal Director IGCAR Kalpakkam for his constant support and encouragement The authors also thank Dr A K Bhaduri Associate Director Materials Development and Technology Group IGCAR for many useful discussions

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