TEM observation and strengthening mechanism of cementite nanoparticles of heterogeneous structure 1045 steel

doi:10.1088/2053-1591/ac144c

	TEM observation and strengthening mechanism of cementite nanoparticles of heterogeneous structure 1045 steel
	Li, Zhengning 2; La, Peiqing 1; Wei, Fuan 3
刊名	MATERIALS RESEARCH EXPRESS
	2021-08
卷号	8 期号:8
关键词	1045 steel cold rolling heterogeneous structure cementite nanoparticles work-hardening
DOI	10.1088/2053-1591/ac144c
英文摘要	A heterogeneous structural (HS) 1045 steel prepared by aluminothermic reaction (AR) casting method was fabricated by combining severe deformation cold rolled with subsequently heating. Its detailed microstructure evolution, mechanical properties, strengthening and toughening mechanisms were investigated. The heterogeneous structure (HS) is characterized with trimodal grain size distribution of ferrite (with microcrystalline grain sizes of >1000 nm, ultrafine grain sizes of similar to 1000 nm, nanocrystalline grain sizes of similar to 100 nm grains, respectively) and cementite nanoparticles (with particle sizes of 11 similar to 120 nm). The HS 1045 steel shows an outstanding strength-ductility synergy. When the cold rolled steel was heated at 400 degrees C with 1 h, comparing with casting steel, the yield strength and tensile strength increased by 87.4% and 35%, to 1420 and 1602 MPa, respectively, and surprisingly, the ductility was only with a small sacrifice, the elongation rate is maintained at the level of 10.6%. The improved strength is mainly attributed to multiple strengthening mechanisms, fine-grain strengthening, cementite nanoparticles strengthening, dislocation strengthening, and solution strengthening. The reasonable ductility can be attributed to the heterogeneous structure, as it can offer an extra work hardening ability introduced by generation of geometrically necessary dislocations (GNDs) near heterointerfaces.
WOS研究方向	Materials Science
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000681054200001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148962]
专题	材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 2.Lanzhou Jiaotong Univ, Sch Mat Sci & Engn, Lanzhou 730070, Peoples R China; 3.Qinghai Univ, Qinghai Prov Key Lab New Light Alloys, Xining 810016, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhengning,La, Peiqing,Wei, Fuan. TEM observation and strengthening mechanism of cementite nanoparticles of heterogeneous structure 1045 steel[J]. MATERIALS RESEARCH EXPRESS,2021,8(8).
APA	Li, Zhengning,La, Peiqing,&Wei, Fuan.(2021).TEM observation and strengthening mechanism of cementite nanoparticles of heterogeneous structure 1045 steel.MATERIALS RESEARCH EXPRESS,8(8).
MLA	Li, Zhengning,et al."TEM observation and strengthening mechanism of cementite nanoparticles of heterogeneous structure 1045 steel".MATERIALS RESEARCH EXPRESS 8.8(2021).