Property and Microstructure Evolution of 20G Steel under High Temperature Loading

SUN Ning; JIANG Yong; GONG Jianming

doi:10.11973/jxgccl201806010

Materials and Mechanical Engineering > 2018 > 42(6): 50-54,58. > DOI: 10.11973/jxgccl201806010

SUN Ning, JIANG Yong, GONG Jianming. Property and Microstructure Evolution of 20G Steel under High Temperature Loading[J]. Materials and Mechanical Engineering, 2018, 42(6): 50-54,58. DOI: 10.11973/jxgccl201806010

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Property and Microstructure Evolution of 20G Steel under High Temperature Loading

Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China

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Received Date: April 18, 2017
Revised Date: May 11, 2018

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Abstract

Tensile testing from room temperature to 850℃ and synchronous creep testing (stress of 62 MPa) and aging treatment (no stress) at 550-850℃ were conducted on 20G steel for water wall tube. The effects of temperature on tensile properties and involution of structure and properties after creep and aging were studied. The results show that the microstructures of tested steel after creep and aging were all composed of ferrite and pearlite. The applied stress improved the spheroidization of pearlite. With imcreasing temperature, the tensile strength of tested steel decreased slightly and then increased and then decreased rapidly; the yield strength decreased approximately linearly; the elongation decreased and then increased and then decreased in fluctuations. With the rise of temperature, the creep fracture time of tested steel was shortened rapidly and then became stable. The creep fracture was controlled by creep cavity nucleation at grain boundaries at 550℃ while by plasticity damage at 650℃.
- 20G steel,
- mechanical property,
- creep behavior,
- pearlite spheroidization

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