STUDY ON THE MULTI–SEGMENT FEATURE OF 625 ℃ CREEP–RUPTURE PROPERTY AND THE QUATITATIVE CHANGE OF PHASE PARAMETERS OF M23C6 AND LAVES PHASES IN EACH SEGMENT OF P92 STEEL

doi:10.3724/SP.J.1037.2009.00653

Acta Metall Sin

2010, Vol. 46

Issue (4): 429-434 DOI: 10.3724/SP.J.1037.2009.00653

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STUDY ON THE MULTI–SEGMENT FEATURE OF 625 ℃ CREEP–RUPTURE PROPERTY AND THE QUATITATIVE CHANGE OF PHASE PARAMETERS OF M₂₃C₆ AND LAVES PHASES IN EACH SEGMENT OF P92 STEEL

PENG Zhifang ¹; CAI Lisheng ¹; PENG Fangfang ²; HU Yongping ³; CHEN Fangyu ⁴

1. School of Power and Mechanical Engineering; Wuhan University; Wuhan 430072
2. Materials Research Department; Dong Fang Boiler Group Corp. Ltd.; Zigong 643001
3. Special Steels Plant; Inner Mongolia North Heavy Industries Group Corp. Ltd.; Baotou 014033
4. Research Institute of Wuhan Iron and Steel Company Ltd.; Wuhan 430080

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PENG Zhifang CAI Lisheng PENG Fangfang HU Yongping CHEN Fangyu. STUDY ON THE MULTI–SEGMENT FEATURE OF 625 ℃ CREEP–RUPTURE PROPERTY AND THE QUATITATIVE CHANGE OF PHASE PARAMETERS OF M₂₃C₆ AND LAVES PHASES IN EACH SEGMENT OF P92 STEEL. Acta Metall Sin, 2010, 46(4): 429-434.

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Abstract

In the present study, the multi–segment feature of stress vs rupture–time plot and the corresponding quatitative change of phase parameters of M₂₃C₆ and Laves in each segment were investigated for P92 steel samples subjected to 625 ℃ creep–rupture tests. The results indicate that the stress vs rupture–time plot obtained from the test results can be divided into two segments (higher stress level and shorter rupture time segment: 180—150 MPa/30—454 h, and lower stress level and longer rupture time segment: 140—110 MPa/2881—10122 h) respectively, and the microstructural evolution is closely related to the feature of each segment. In the higher stress level and shorter rupture time segment the M₂₃C₆ particles are coarsened, while in the lower stress level and longer rupture time segment both M₂₃C₆ and Laves phases are coarsened, but the latter is predominantly. The average composition, the amount and the elemental partitioning of each alloy phase called phase parameters can be determined by a multiphase separation method developed.

Key words: P92 steel multi-region analysis for creep-rupture property M₂₃C₆ phase Laves phase

Received: 27 September 2009

Fund:

Supported by National Natural Science Foundation of China (No.50674072) and Scientific Research Project of Dong Fang Boiler Group Corp. Ltd., 2009

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00653 OR https://www.ams.org.cn/EN/Y2010/V46/I4/429

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