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Thermal Simulation Analysis of Microstructure and Hardness for CrMoV with PWHT in Type IV Region

  • Topical Collection: Physical and Numerical Simulations of Materials Processing
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Abstract

Welded components of CrMoV steam pipe exhibit a pernicious form of type IV cracking after long-term service at elevated temperature. To investigate the cracking mechanism, the type IV microstructure and hardness were characterized after thermal simulation of post-weld heat treatment. Below 1098 K (825 °C), loss of carbon from the pearlite region was apparent, and the work zone exhibited a slightly lower hardness than the parent material because of a minor amount of austenite transformation. In addition, for peak temperatures above 1133 K (860 °C), additional transformation into austenite occurred and was followed by retransformation into ferrite upon further increasing the temperature. The pearlite formed at 1173 K to 1223 K (900 °C to 950 °C) resulted in an increase of the volume fraction of pearlite and microstructural refinement, which yielded a remarkable increase of hardness in the work zone. For the peak temperature of 1573 K (1300 °C), previous austenite grains were coarsened and alloy carbides were dissolved in the austenite, which significantly hardened the work zone.

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Abbreviations

Ac1:

Start of transformation on heating

Ac3:

Finish of transformation on heating

TS:

Start of transformation on cooling

TF:

Finish of transformation on cooling

TRANGE:

Temperature range of rapid transformation

TP:

Peak temperature

CT:

Cooling time [from TP to 773 K (500 °C)]

HR:

Heating rate, temperature range 573 K to 973 K (300 °C to 700 °C)

T1:

Start of high-temperature transformation on cooling

T2:

Finish of high-temperature transformation on cooling

TM:

Temperature of maximum transformation rate

PWHT:

Post-weld heat treatment

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Acknowledgments

One of the authors (Bin Xu) wishes to acknowledge Professor Jitai Niu for his exceeding support and encouragement to collaborate on CrMoV thermal simulation studies. All authors would like to acknowledge the support by Doctoral Funds from Southwest University of Science and Technology (13zx7153, 10zx7143). We thank Tiffany Jain, M.S., from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of this manuscript.

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Authors and Affiliations

  1. Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China

    Bin Xu, Song Xue, Yong Cai, Jitai Niu & Liangchao Li

  2. School of Materials Science and Engineering, Harbin Institute of technology, Harbin, 150001, China

    Jitai Niu

  3. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Jitai Niu

Authors
  1. Bin Xu
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  2. Song Xue
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  3. Yong Cai
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  4. Jitai Niu
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  5. Liangchao Li
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Corresponding author

Correspondence to Bin Xu.

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Manuscript submitted November 14, 2016.

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Xu, B., Xue, S., Cai, Y. et al. Thermal Simulation Analysis of Microstructure and Hardness for CrMoV with PWHT in Type IV Region. Metall Mater Trans B 48, 2813–2819 (2017). https://doi.org/10.1007/s11663-017-1084-8

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  • DOI: https://doi.org/10.1007/s11663-017-1084-8

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