Effect of Heat Treatment on Delta-ferrite and Impact Toughness of P91 Heat-resistant Steel

doi:10.11896/j.issn.1005-023X.2018.08.021

	Effect of Heat Treatment on Delta-ferrite and Impact Toughness of P91 Heat-resistant Steel
	Zhang, Jianbin 1; Liu, Fan 1; Xue, Fei 2
刊名	Cailiao Daobao/Materials Review
	2018-04-25
卷号	32 期号:4 页码:1318-1322
关键词	Austenite Brittle fracture Ferrite Heat treatment Hot rolled steel Hot rolling Microstructure Morphology Scanning electron microscopy Delta ferrite Effect of heat treatments Energy dispersive spectrometry Fracture failure modes Heat-resistant steel Heat-treatment processing Impact fracture Mixed microstructures
ISSN号	1005023X
DOI	10.11896/j.issn.1005-023X.2018.08.021
英文摘要	Delta-ferrite, whose morphology, content and distribution depended on hot processing temperature, readily generated in P91 heat-resistant steel during hot processing, such as hot rolling, welding and heat treatment. The mixed microstructure, including martensite and delta-ferrite, was obtained by normalizing at different temperatures (1 150,1 250,1 300) in accor-dance with the designed heat treatment processing, and the normalizing microstructure (1 300) undertook oil cooling (at 1 050)+air cooling (at 760). The content, morphology and distribution of delta-ferrite were observed by OM (optical microscope), SEM (scanning electron microscope) with EDS (energy-dispersive spectrometry), and the microhardness, impact toughness and fracture failure mode of that were tested. The results demonstrated that delta-ferrite content of P91 steel increased along with the increase of normalizing temperature, and its morphology presented thin strip, strip and bulk, and bulk polygon. The delta-ferrite generated due normalizing at 1 300 could not be eliminated by normalizing at 1 050 and tempering at 760, while the content decreased, morphology and distribution of delta-ferrite altered. The impact energy reduced with increase in delta-ferrite content, and the impact fracture failure mode converted to brittle fracture from ductile-brittle fracture. In contrast with strip morphology, the bulk polygon of delta-ferrite at boundaries was not conducive to impact toughness. © 2018, Materials Review Magazine. All right reserved.
语种	中文
出版者	Cailiao Daobaoshe/ Materials Review
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114519]
专题	材料科学与工程学院保卫处
作者单位	1.State Key Laboratory of Advanced Processing and Recyling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Suzhou Nuclear Power Research Institute, Suzhou; 215004, China
推荐引用方式 GB/T 7714	Zhang, Jianbin,Liu, Fan,Xue, Fei. Effect of Heat Treatment on Delta-ferrite and Impact Toughness of P91 Heat-resistant Steel[J]. Cailiao Daobao/Materials Review,2018,32(4):1318-1322.
APA	Zhang, Jianbin,Liu, Fan,&Xue, Fei.(2018).Effect of Heat Treatment on Delta-ferrite and Impact Toughness of P91 Heat-resistant Steel.Cailiao Daobao/Materials Review,32(4),1318-1322.
MLA	Zhang, Jianbin,et al."Effect of Heat Treatment on Delta-ferrite and Impact Toughness of P91 Heat-resistant Steel".Cailiao Daobao/Materials Review 32.4(2018):1318-1322.