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| Effect of aluminum content on δ-ferrite content and impact properties of heat resistant steel |
| ZHANG Ze-cheng1，ZHAO Cheng-zhi1，ZHANG He-xin1，YAN Tao2，DING Chao2，LI Wei3 |
1. College of Materials Science and Chemical Engineering， Harbin Engineering University， Harbin 150001， Heilongjiang， China
2. General Manager’s Office， Jiangsu Province Yancheng Shengtai Valve Co.， Ltd.， Yancheng 224000， Jiangsu， China
3. Technical Department， Jiangsu Province Yancheng Shengtai Value Co.， Ltd.， Yancheng 224000， Jiangsu, China |
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Abstract With Thermo-Calc software and experiments， the equilibrium phases existing in ZG1Cr10NiAlMoVNbN heat-resistant steel from 200 to 1 600 ℃ and equilibrium solidification process were calculated. The microstructures and impact properties of three kinds of tested steels were investigated. Results show that the equilibrium phases of the tested steel containing 0.10%Al was single γ at 1 050 ℃， after the heat-treatment， austenitic transformed into martensitic completely， which is consistent with the experimental results. The equilibrium phases of the tested steel containing 0.91%Al were γ＋δ， which agrees well with the observed microstructure that consists of martensitic and austenitic. And the equilibrium phases of the tested steel containing 3.67%Al was single δ， which agrees well with the experimental results. Meanwhile， the impact energy reduced significantly with the increase of Aluminum content， the fracture mechanism changed from the dimple fracture to cleavage fracture.
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Received: 22 September 2014
Published: 11 June 2015
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2015, Vol. 50 
