Effects of M C-23(6) on the High-Temperature Performance of Ni-Based Welding Material NiCrFe-7

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	Effects of M C-23(6) on the High-Temperature Performance of Ni-Based Welding Material NiCrFe-7
	W. L. Mo; S. P. Lu; D. Z. Li; Y. Y. Li
	2014
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	45A 期号:11 页码:5114-5126
摘要	The effects of M C-23(6) (M = Cr, Fe) on the high-temperature performance of the NiCrFe-7 welding rods and weld metals were studied by high-temperature tensile tests and microstructure analysis. M C-23(6) at the grain boundaries (GBs) has a cube-on-cube coherence with one grain in the NiCrFe-7 weld metals, and the adjacent M C-23(6) has the coherence relationship with the same grain. The grain with a coherent M C-23(6) has a Cr-depletion region. The number and size of M C-23(6) particles can be adjusted by heat treatment and alloying. There are two temperatures [T (E1): 923 K to 1083 K (650 A degrees C to 810 A degrees C) and T (E2): 1143 K to 1203 K (870 A degrees C to 930 A degrees C)] at which the GBs and grains of the NiCrFe-7 welding rod have equal strength during the high-temperature tensile test. When the temperatures are between T (E1) and T (E2), the strength of the GBs is lower than that of the grains, and the tensile fractures are intergranular. When the temperatures are below T (E1) or over T (E2), the strength of the GBs is higher than that of the grains, and the tensile fractures are dimples. M C-23(6) precipitates at the GBs, which deteriorates the ductility of the welding rods at temperature between T (E1) and T (E2). M C-23(6) aggravates ductility-dip-cracking (DDC) in the weld metals. The addition of Nb and Ti can form MX (M = Ti, Nb, X = C, N), fix C in grain, decrease the initial precipitation temperature of M C-23(6), and mitigate the precipitation of M C-23(6), which is helpful for minimizing DDC in the weld.
部门归属	[mo, wenlin ; lu, shanping ; li, dianzhong ; li, yiyi] chinese acad sci, inst met res chinese, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; mo, wl (reprint author), chinese acad sci, inst met res chinese, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; shplu@imr.ac.cn
关键词	Ductility-dip Cracking Filler Metal Composition M23c6 Carbide Precipitation Alloy 690 Part Ii Stainless-steel Nickel Behavior Embrittlement Superalloy
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73344
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. L. Mo,S. P. Lu,D. Z. Li,et al. Effects of M C-23(6) on the High-Temperature Performance of Ni-Based Welding Material NiCrFe-7[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2014,45A(11):5114-5126.
APA	W. L. Mo,S. P. Lu,D. Z. Li,&Y. Y. Li.(2014).Effects of M C-23(6) on the High-Temperature Performance of Ni-Based Welding Material NiCrFe-7.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,45A(11),5114-5126.
MLA	W. L. Mo,et al."Effects of M C-23(6) on the High-Temperature Performance of Ni-Based Welding Material NiCrFe-7".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 45A.11(2014):5114-5126.