|
|
|
| Precipitation Behavior of Chi (χ) Phase in Super Duplex Stainless Steel 00Cr25Ni7Mo4N |
| ZHANG Shou-lu,ZHAO Yong-xian,SONG Li-qiang |
| （Shanxi Taigang Stainless Steel Co., Ltd.， Taiyuan 030003， Shanxi， China） |
|
|
|
|
Abstract Precipitation behavior of chi (χ) phase in the super duplex stainless steel 00Cr25Ni7Mo4N was investigated during an aging process at different temperature from 600℃ to 1000℃ and during an isothermal aging process at 920℃ and 830℃. The backscatter electron detector of SEM was used to examine the amount and distribution of Chi (χ) precipitate. TEM and EDS were used to examine the structure and chemical composition of χ-phase. The results show that the precipitation temperature region of χ-phase is from 750℃ to 920℃, and the peak temperature is about 830 ℃. Comparing with σ-phase precipitation, the amount of χ-phase precipitates is few. The α/γ interfaces and the α/α grain boundaries are the main sites of χ-phase precipitates. During an isothermal aging process, it is found that the precipitation of χ-phase in the 00Cr25Ni7Mo4N steel includes four stages of initiation, rapid precipitation, saturation and transformation into σ-phase. Therefore, the χ-phase is a meta-stable phase, which will gradually transform into the σ-phase after a prolonged aging.
|
|
Received: 10 November 2010
Published: 20 February 2012
|
|
|
|
| [1] |
YANG Chen-xing1,2,WU Zhi-wei1,2,YANG Mao-sheng2,ZHAO Kun-yu1. Microstructure and mechanical properties of Ni-Cr bearing alloy in solution aging treatment[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(3): 242-252. |
| [2] |
WANG Li-jun，，RUAN Shi-peng，，WANG Ning-tao，，ZHAI Jin-po，， ZHANG Su-ping，，WANG Jing，. Development and application on non-quenched and tempered steel for high strength fasteners[J]. Iron and Steel, 2018, 53(11): 102-106. |
| [3] |
WANG Li-ying. Influence of the high temperature aging on the microstructure and mechanical properties of 441 stainless steel[J]. Chinese Journal of Iron and Steel, 2017, 35(5): 15-19. |
| [4] |
ZHANG Gao-feng,LIAO Li. White Spot Fracture of Steel Plate After Tensile[J]. Chinese Journal of Iron and Steel, 2013, 31(6): 46-53. |
| [5] |
LIU Jia-man1,FENG Ai-han2. Crack Failure Analysis of a Cylinder Sleeve From a Diesel Engine[J]. Chinese Journal of Iron and Steel, 2012, 30(2): 29-31. |
| [6] |
YANG Chang-chun1,2，KANG Yong-lin1，WANG Li-xin2，QIN Sheng1. Effect of Aging Treatment on Impact Properties of Cr20Ni32AlTi Alloy at Room Temperature[J]. Chinese Journal of Iron and Steel, 2012, 24(03): 50-52. |
|
|
|
|
2012, Vol. 47 
