HTM ›› 2020, Vol. 45 ›› Issue (2): 105-107.DOI: 10.13251/j.issn.0254-6051.2020.02.020

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Effect of tempering temperature on microstructure and properties of Cr-Ni alloy structural steel

Yang Xi1,2, Su Chunxia1,2, Chen Benwen1,2, Li Peixing3, Gao Shan2, Li Fukun1,2   

  1. 1. State Key Laboratory of Mental Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
    2. Technology Center, Angang Steel Co., Ltd., Anshan Liaoning 114009, China;
    3. Production Department, Angang Steel Co., Ltd., Anshan Liaoning 114009, China
  • Received:2019-08-26 Online:2020-02-25 Published:2020-04-03

Abstract:

Microstructures and mechanical properties of Cr-Ni alloy structural steel under different tempering temperatures were studied by means of tensile tester, impact tester, hardness tester, metallographic microscope, scanning electron microscope, transmission electron microscopy and other equipments. The results show that the hardness and strength of the tested steel decline, plasticity and toughness decrease at first, then show a curve platform rising slowly and increase linearly at last with the increase of tempering temperatures. Under lower temperature the shear lip is composed of dimples, some of them are big and shallow. The core parts are quasi-cleavage fracture. The quantity of dimples increases with the rising of tempering temperatures. After quenching and tempering at 200 ℃, the microstructure is tempered martensite with small amount of carbide and clear lath boundaries, when tempered at 400 ℃, the microstructure is tempered troostite with rod carbide and fuzzy boundaries, and when tempered at 600 ℃, the microstructure is tempered sorbite with globular carbide and no lath boundaries.

Key words: tempering temperature, microstructure, properties, low temperature toughness

CLC Number: