Effect of tempering temperature on microstructure and properties of heat-resistant steel

doi:10.13251/j.issn.0254-6051.2022.07.023

Abstract

Abstract: Morphology and distribution of carbides in a heat-resistant steel with 0.01%boron after tempering at 200-650 ℃ and their effect on mechanical properties were studied by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), Brinell hardness test and tensile test. The results show that as the tempering temperature increases, the average size of carbides gradually increases, and its shape gradually changes from flake at low tempering temperature to block at high tempering temperature. The hardness, tensile strength and yield strength of the heat-resistant steel increase first and then decrease with the increases of tempering temperature, and the elongation increases from 6% to 12%. With the increases of tempering temperature, the tensile fracture of the heat-resistant steel changes from brittle fracture to ductile fracture, and its morphology changes from river pattern to dimples.

Key words: heat-resistant steel, carbide, tempering temperature, precipitation

CLC Number:

TG161

Kuang Chengyang, Ma Yulin, Wang Chenyu, He Jiayong, Lu Kun. Effect of tempering temperature on microstructure and properties of heat-resistant steel[J]. Heat Treatment of Metals, 2022, 47(7): 129-133.

References

[1]Aghajani A, Somsen C, Eggeler G. On the effect of long-term creep on the microstructure of a 12% chromium tempered martensite ferritic steel[J]. Acta Materialia, 2009, 57(17): 5093-5106.
[2]Prat O, Garcia J, Rojas D, et al. The role of Laves phase on microstructure evolution and creep strength of novel 9%Cr heat resistant steels[J]. Intermetallics, 2013, 32: 362-372.
[3]Han Hongguang, Shen Junjie, Xie Jiaxing. Author correction: Effects of precipitates evolution on low stress creep properties in P92 heat-resistant steel[J]. Scientific Reports, 2019, 9(1): 9567.
[4]Ma Y, Zhang J, Zhang J, et al. Retracted: Dissolution behavior of boron nitride inclusions and segregation of Nb element in martensitic ferritic steel[J]. Steel Research International, 2019: 1900488.
[5]Grange R A, Garvey T M. Factors affecting the hardenability of boron-treated steels[J]. Transactions of American Society Metals, 1946, 37: 136-191.
[6]Hong S, Lee J, Park K S, et al. Effects of boron addition on tensile and Charpy impact properties in high-phosphorous steels[J]. Materials Science and Engineering A, 2014, 589: 165-173.
[7]Rodriguez-Galeano K F, Rodriguez-Baracaldo R, Mestra-Rodriguez A, et al. Influence of boron content on the fracture toughness and fatigue crack propagation kinetics of bainitic steels[J]. Theoretical and Applied Fracture Mechanics, 2016, 86: 351-360.
[8]Gharsallah H I, Makhlouf T, Saurina J, et al. Effect of boron addition on structural and magnetic properties of nanostructured Fe₇₅Al₂₅ alloy prepared by high energy ball milling[J]. Materials Letters, 2016, 181: 21-24.
[9]Gomez-Vargas O A, Solis-Romero J, Figueroa-Lopez U, et al. Boro-nitriding coating on pure iron by powder-pack boriding and nitriding processes[J]. Materials Letters, 2016, 176: 261-264.
[10]Ezatpour H R, Torabi-Parizi M, Ebrahimi G R, et al. Effect of micro-alloy elements on dynamic recrystallization behavior of a high-manganese steel[J]. Steel Research International, 2018, 89(7): 1700559.
[11]Abe F, Tabuchi M, Tsukamoto S. Mechanisms for boron effect on microstructure and creep strength of ferritic power plant steels[J]. Energy Materials, 2009, 4(4): 166-174.
[12]Abe F. Research and development of heat-resistant materials for advanced USC power plants with steam temperatures of 700 ℃ and above[J]. Engineering, 2015, 1(2): 211-224.
[13]王斌, 梁军, 荆洪阳, 等. 时效温度对S31042奥氏体耐热钢析出相的影响[J]. 热加工工艺, 2016, 45(18): 195-200.
Wang Bin, Liang Jun, Jin Hongyang, et al. Effect of aging temperature on precipitated phase in S31042 austenite heat resistant steel[J]. Hot Working Technology, 2016, 45(18): 195-200.
[14]Taneike M, Sawada K, Abe F. Effect of carbon concentration on precipitation behavior of M₂₃C₆ carbides and MX carbonitrides in martensitic 9Cr steel during heat treatment[J]. Metallurgical and Materials Transactions A, 2004, 35(4): 1255-1262.
[15]聂铭, 张健, 黄丰, 等. T/P92耐热钢研究进展[J]. 金属热处理, 2013, 38(11): 40-44.
Nie Ming, Zhang Jian, Huang Feng, et al. Research progress of T/P92 heat-resistant steels[J]. Heat Treatment of Metals, 2013, 38(11): 40-44.
[16]Isik M I, Kostka A, Eggeler G. On the nucleation of Laves phase particles during high-temperature exposure and creep of tempered martensite ferritic steels[J]. Acta Materialia, 2014, 81: 230-240.
[17]Hättestrand M, Andrén H O. Boron distribution in 9-12% chromium steels[J]. Materials Science and Engineering A, 1999, 270(1): 33-37.