Creep crack growth behavior in the HAZ of weldments of W containing high Cr steel

Tabuchi, Masaaki; Watanabe, Takashi; Kubo, Kiyoshi; Matsui, Masanao; Kinugawa, Junichi; Abe, Fujio

doi:10.1016/s0308-0161(01)00090-4

Cited by 101 publications

(43 citation statements)

References 5 publications

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“…Neither the preheating nor the multipass welding had any effect on the weld thermal cycle recorded. Ac 1 and Ac 3 temperatures reported for this steel 10) along with the locations in HAZ for the corresponding peak temperatures are also shown in Fig. 1…”

Section: Preparation Of the Weld Padmentioning

confidence: 86%

“…This is due to the problem of Type IV cracking, fracture in the heat affected zone (HAZ) close to base metal of the weld joint during high temperature service or during a creep test. 6,7) Intercritical HAZ (ICHAZ) heated to a maximum temperature between Ac1 and Ac 3 7,8) and fine grained HAZ (heated to just above Ac 3 ) 9,10) are known to be the locations where Type IV cracking occur. Though Type IV cracking is a well known problem in the ferritic steels, its significance is more in the new class of steels, because difference in the rupture strength for the base metal and weld joint seems to be more for these steels than the low Cr steels.…”

Section: Introductionmentioning

confidence: 99%

“…11) Further it is reported that there is significant evidence to indicate that Type IV cracking in advanced alloy steel plant may become a problem at temperatures above 838 K. 12) It has been found that in some of the new generation steels, rupture life for the weld joint is only around 20 % of the base metal for identical conditions of testing. 10) Microstructural changes that take place in the HAZ during welding, subsequent post weld heat treatment (PWHT) and service or creep tests play a major role in promoting this type of cracking.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural Investigations on Type IV Cracking in a High Cr Steel.

et al. 2002

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Section: Preparation Of the Weld Padmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Investigations on Type IV Cracking in a High Cr Steel.

et al. 2002

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“…So the weld joint becomes susceptible to premature type IV creep failure. A PWHT becomes helpful in improvement of weld joint from type IV failure [2][8] [9]. It was observed that rupture location of weld joint of P91 steel shifted from weld metal at higher stress condition to fine grain HAZ adjacent to base metal zone at a lower stress condition [10].…”

Section: Weldability P91 Steelmentioning

confidence: 99%

A Review of Effect of Welding and Post Weld Heat Treatment on Microstructure and Mechanical Properties of Grade 91 Steel

Samir¹

2015

IJRET

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“…They were subjected to the thermal cycle shown in Fig.1a by furnace heat treatment. M. Tabuchi et al reported that the simulated HAZ specimen of P122 steel heated up to the A C3 temperature showed the minimum creep strength [7]. Based on their results, we chose the A C3 temperature of P92 steel（1203K）as the peak temperature during heating.…”

Section: Fghaz Simulation By Furnace Heatingmentioning

confidence: 99%

The method for reproducing fine grained HAZ of W strengthened high Cr steel

Wang

Liu

et al. 2014

Materials Science and Engineering: A

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Type IV failure, the key life time limiting factor for high Cr steel strengthened with W steel such as P92, occurs in the fine grain heat affected zone (FGHAZ) of a weld. However, the actual size of FGHAZ in a weld is too small (1-2mm), it is necessary to re-produce sizeable uniform specimen for creep tests (such as smooth and notched bar) in order to investigate its creep properties and micro-structural evolutions. This paper investigated two simulation methods for the re-production of FGHAZ, e.g. weld simulator and heat treatment in furnace. The microstructures, hardness, and creep rupture time under 923K/100MPa were investigated and compared with the actual FGHAZ of a weld joint. The dimensional big enough FGHAZ specimen, re-produced by het treatment in furnace, were also crept at 923K/110MPa and 100MPa and compared with that of the base metal. It was found that 1) both the simulated FGHAZ show the similar microstructures and hardness as that of actual FGHAZ of a weld joint, e.g. small grain size (less than 10m), the disappearance of martensitic lath and the formation of equiaxed grain, and a lowering micro-hardness of 30-40HV , 2) both the simulated FGHAZ demonstrate the similar creep rupture time as that of actual FGHAZ of a weld joint and it is shorter than that of base metal, which is similar to others' finding, 3) in comparison with the base metal, the creep test of FGHAZ reproduced by heat treatment in furnace show a short transitional period and early occurrence of and a prolonged tertiary stage, indicating a deterioration of creep strength. It is concluded that 1) the uniform FGHAZ reproduced via a weld simulator is in the order of 10 to 15 mm long and is not longer enough for creep test; 2) heat treatment in furnace can reproduce the representative FGHAZ required for creep research and the difference of the thermal cycle experienced in a actual welding and heat treatment in furnace is minor and negligible.

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Creep crack growth behavior in the HAZ of weldments of W containing high Cr steel

Cited by 101 publications

References 5 publications

Microstructural Investigations on Type IV Cracking in a High Cr Steel.

Microstructural Investigations on Type IV Cracking in a High Cr Steel.

A Review of Effect of Welding and Post Weld Heat Treatment on Microstructure and Mechanical Properties of Grade 91 Steel

The method for reproducing fine grained HAZ of W strengthened high Cr steel

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