Effect of tempering temperature on microstructure and mechanical properties of high-strength armor steel

doi:10.13251/j.issn.0254-6051.2020.11.030

Abstract

Abstract: Evolution of microstructure and mechanical properties of quenched and tempered PRO500 high-strength armor steel was studied by means of optical microscopy and transmission electron microscope (TEM). The results show that the quenched microstructure at 870 ℃ is lath martensite. With the tempering temperature increasing, martensite is decomposed gradually, and the fine carbide particles are precipitated and accumulated, the overall hardness decreases gradually. Simultaneously the minimum hardness is 274 HV10 when tempered at 600 ℃. When tempered at 400 ℃, the excellent comprehensive mechanical properties are obtained with the hardness of 389 HV10, and the tensile strength, the proof strength (plastic extension) and the elongation reach 1710 MPa, 1460 MPa and 11.0%, respectively.

Key words: tempering temperature, high-strength armor steel, microstructure, mechanical properties

CLC Number:

TG156.5

Chen Jianhua, Lan Xiuqiong. Effect of tempering temperature on microstructure and mechanical properties of high-strength armor steel[J]. Heat Treatment of Metals, 2020, 45(11): 163-166.

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