Probing true creep-hardening interaction in weld simulated heat affected zone of P91 steels
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
View Archive InfoField | Value | |
Title |
Probing true creep-hardening interaction in weld simulated heat affected zone of P91 steels
|
|
Creator |
Akhtar, M
Khajuria, A |
|
Subject |
Steel Metallurgy
|
|
Description |
The inducement of this paper was to discuss the novel perspective in establishing true creep-hardening interaction at room temperature by hardness and at high temperature by impression creep testing in two boron modified P91 steels. Different sub-heat affected zones(HAZs)were physically simulated. Their creep-strengths were governed by heat treatment,grain-size,hardness,boron addition,and microstructural stability. Post weld heat treatment resulted inreduction in hardness by 50%whereas, impression creep testing showed enhanced creep-strength (50–77%) and the narrow band of creep-damage (∼57%) in P91B steel than P91 steel. An increase in creep-rate with the increase inprior-austenitegra in size show edgra in boundary embrittlement in P91 steel. Whereas, with an increase in creep-rate and the corresponding decrease in prior-austenite grain size show edgra in boundary and sub-grain boundary hardening in P91B steel.Further more,type-IV(fine-grain HAZ) and type-III (coarse-grain HAZ) failures were observed depending upon critical prior-austenite grain size of 17μm in P91 and P91B samples respectively.Based on prior-austenitegra in size and creep-strength,sub-HAZs were classified into different classes pursuant to the nature of creep-damage and discussed systematically.Grain boundary hardening was ineffective for both coarse + finegra in HAZ(CF)and B-CF due to the lock in gmovement of fine-grains.However,the formation of soft ferrite grain sweakens both coarse+inter-critical HAZ(CI) and B-CI.ThisstudyprovidedbetterunderstandingoffailuremechanismsinP91andP91Bsteelsthatresultsin the delay of failures of power plant components.
|
|
Publisher |
Elsevier
|
|
Date |
2019-04
|
|
Type |
Article
PeerReviewed |
|
Format |
application/pdf
|
|
Identifier |
http://eprints.nmlindia.org/8019/1/Modassir3-2019.pdf
Akhtar, M and Khajuria, A (2019) Probing true creep-hardening interaction in weld simulated heat affected zone of P91 steels. Journal of Manufacturing Processes, 46 (IF-3.462). pp. 345-356. |
|
Relation |
https://doi.org/10.1016/j.jmapro.2019.08.029
http://eprints.nmlindia.org/8019/ |
|