Microstructure and Mechanical Properties of Heat-treated T92 Martensitic Heat Resistant Steel

High Temperature Materials and Processes

Devakumaran K.¹  Muthupandi V.¹  Rajesh Kannan P.²  Arivazhagan B.³ 

[1] Fax No. [phone];Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli-620015, India. Tel. [phone];Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli-620015, India. Tel. [phone];

关键词: t92 steel;    heat treatment;    microstructure;    hardness;    tensile test;    grain boundary decohesion;   

DOI  :  10.1515/htmp-2016-0030

来源: DOAJ

【 摘 要 】

T92 samples were solutionized at 1,050 °C, 1,100 °C and 1,150 °C for 20 min and then tempered at 730 °C, 745 °C and 760 °C for 60 min. Optical microscopy studies were carried out to understand the microstructural evolution due to heat treatment. These heat-treated samples comprised of lath martensite microstructure in all the cases. Prior austenite grain size of the heat-treated samples increased with solutionizing temperature. Tensile properties were evaluated using micro-tensile samples. Hardness values of the heat-treated samples were estimated using Vickers hardness tester. Interestingly, for all the given tempering condition, the hardness values showed an increasing trend with solutionizing temperature while their tensile strength values tend to decrease. Fractograph analysis depicted that increasing the solutionizing temperature led to grain boundary decohesion.

【 授权许可】

Unknown