Effects of Various Heat Inputs and Reheating Processes on the Microstructure and Properties of Low-Carbon Bainite Weld Metals Containing 4% Ni

doi:10.1007/s11665-022-07061-3

	Effects of Various Heat Inputs and Reheating Processes on the Microstructure and Properties of Low-Carbon Bainite Weld Metals Containing 4% Ni
	Dong, Wanlong 1,3; Ma, Chunwei 4; Li, Wei 1,3; Cao, Rui 1,3; Liang, Chen 1,3; Zhu, Wanchao 1,3; Mao, Gaojun 1,3; Guo, Xili 2; Jiang, Yong 2; Chen, Jianhong 1,3
刊名	JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
	2022-06-01
关键词	cooling rate fracture heat input impact toughness low-carbon bainite weld metal
ISSN号	1059-9495
DOI	10.1007/s11665-022-07061-3
英文摘要	The effects of welding heat inputs and reheating processes with various cooling rates were investigated by thermally simulated experiments on the microstructure, tensile strength and impact toughness of high-strength weld metals containing 4% Ni. The microstructure was characterized by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). As a result, an extended continuous cooling transformation (e-CCT) diagram was established. The change in the microstructures is affected from three perspectives. The coarser grains and the generated martensite-austenite (M-A) constituents lead to the deterioration of impact toughness and ultimate tensile strength with the increase in heat inputs. The reheating processes with various cooling rates can change the microstructure, hardness, impact toughness and large angle boundaries. When the heat input increases from 15.8 to 17.9 kJ/cm, the content of block ferrite decreases from the initial 18.9 to 8.5%, and the content of lath bainite increases accordingly. When the heat input is 20.6 kJ/cm, the content of block ferrite increases is 17.3% and the rest is lath bainite. The hardness first decreases in the lower cooling rate range (0.05 similar to 1 degrees C/s) and then increases at higher cooling rates. The minimum hardness at a cooling rate of 1 degrees C/s may be related to the decrease in the coarse block M-A constituents. The reheating process decreases the impact toughness at room temperature from 83 to 37.45 J for the specimen with a cooling rate of 30 degrees C/s and increases the impact toughness from 83 to 99.71 J for the specimen with a cooling rate of 0.5 degrees C/s. The impact toughness at -50 degrees C after the reheating processes decreases from 74 to 32 J, and the lowest impact toughness after the reheating processes reaches only 32 J. The proportion of high-angle grain boundaries (HAGBs) first increases from 12.13 to 26. 44% and then decreases to 16.34% with increasing cooling rate.
WOS研究方向	Materials Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000817036000013
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158919]
专题	材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China; 2.Atlantic China Welding Consumables Inc, Zigong 643000, Peoples R China 3.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 4.Shanghai Univ Engn Sci, Sch Mat Engn, 333 Longteng Rd, Shanghai 201620, Peoples R China;
推荐引用方式 GB/T 7714	Dong, Wanlong,Ma, Chunwei,Li, Wei,et al. Effects of Various Heat Inputs and Reheating Processes on the Microstructure and Properties of Low-Carbon Bainite Weld Metals Containing 4% Ni[J]. JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE,2022.
APA	Dong, Wanlong.,Ma, Chunwei.,Li, Wei.,Cao, Rui.,Liang, Chen.,...&Chen, Jianhong.(2022).Effects of Various Heat Inputs and Reheating Processes on the Microstructure and Properties of Low-Carbon Bainite Weld Metals Containing 4% Ni.JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE.
MLA	Dong, Wanlong,et al."Effects of Various Heat Inputs and Reheating Processes on the Microstructure and Properties of Low-Carbon Bainite Weld Metals Containing 4% Ni".JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2022).