EFFECT OF DEFORMATION AND THERMOMECHA- NICAL PROCESSING ON GRAIN BOUNDARY CHARACTER DISTRIBUTION OF ALLOY 825 TUBES

doi:10.11900/0412.1961.2015.00124

Acta Metall Sin

2015, Vol. 51

Issue (12): 1465-1471 DOI: 10.11900/0412.1961.2015.00124

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EFFECT OF DEFORMATION AND THERMOMECHA- NICAL PROCESSING ON GRAIN BOUNDARY CHARACTER DISTRIBUTION OF ALLOY 825 TUBES

Qing ZHAO¹,Shuang XIA¹(

),Bangxin ZHOU¹,Qin BAI¹,Cheng SU²,Baoshun WANG²,Zhigang CAI²

1 School of Materials Science and Engineering, Shanghai University, Shanghai 200072
2 Zhejiang Jiuli Hi-Tech Metals Co. Ltd., Huzhou 313008

Cite this article:

Qing ZHAO,Shuang XIA,Bangxin ZHOU,Qin BAI,Cheng SU,Baoshun WANG,Zhigang CAI. EFFECT OF DEFORMATION AND THERMOMECHA- NICAL PROCESSING ON GRAIN BOUNDARY CHARACTER DISTRIBUTION OF ALLOY 825 TUBES. Acta Metall Sin, 2015, 51(12): 1465-1471.

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Abstract

Alloy 825 is widely used for chemical and petrochemical applications due to its good combination of mechanical properties and corrosion resistance. However, intergranular corrosion (IGC) is one of the serious problems for alloy 825 exposed to aggressive environments, which could result in unexpected failures and lead to huge losses. The grain boundary structure, which can partly be described by coincidence site lattice (CSL) model, can influence the grain boundary chemistry and the susceptibility to intergranular corrosion. The field of grain boundary engineering (GBE) has developed a lot over the last two decades since the concept of grain boundary design was proposed. The aim of GBE is to enhance the grain-boundary-related properties of materials by increasing the frequency of low ΣCSL (Σ≤29) grain boundaries (GBs) and tailoring the grain boundary network. It was reported that in some fcc materials with low stacking fault energy, such as Ni-based alloys, lead alloys, austenitic stainless steels and copper alloys, the frequency of low ΣCSL GBs can be greatly increased by using proper thermomechanical processing (TMP), and as a result the grain boundary related properties were greatly enhanced. In this work, GBE is applied to the manufacture of Ni-based alloy 825 tubes by cold drawing using a draw-bench on a factory production line and the subsequent annealing. The effect of thermomechanical processing on the grain boundary character distribution (GBCD) of alloy 825 was studied by means of the EBSD technique and orientation image microcopy (OIM). The results show that the proportion of low ΣCSL grain boundaries increase to more than 75% by the TMP after 5% cold drawing and subsequent annealing at 1050 ℃ for 10 min, and simultaneously the large-size highly-twinned grain-cluster microstructure is formed. The size of the grain-cluster and proportion of low ΣCSL grain boundaries decrease with the increase of pre-strain. The proportion of low ΣCSL grain boundaries decreases with the increase of the mean grain size. The annealing temperatures in the range of 1050~1125 ℃ have no obvious effect on the GBCD of the specimen with 5% cold drawing deformation; while the proportions of low ΣCSL GBs of the sample with 3%, 7% and 10% cold drawing deformation decrease with the increase of annealing temperature.

Key words: Ni-based alloy 825 grain boundary character distribution low ΣCSL grain boundary grain size

Fund: Supported by National Basic Research Program of China (No.2011CB610502) and Shanghai Science and Technology Commission Key Support Project (No.13520500500)

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	Qing ZHAO
	Shuang XIA
	Bangxin ZHOU
	Qin BAI
	Cheng SU
	Baoshun WANG
	Zhigang CAI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00124 OR https://www.ams.org.cn/EN/Y2015/V51/I12/1465

Fig.1 OM image (a), distribution of grain boundaries (b) and orientation distribution of grains (c) of solution annealed 825 alloy tube

Fig.2 Effect of cold drawing deformation and annealing temperature on length fraction of Σ3 (a), Σ9+Σ27 (b), and overall low ΣCSL (c) and mean grain size (d) of 825 alloy

Fig.3 Length fraction ratio of (Σ9+Σ27)/Σ3 in 825 alloy after different cold drawing deformation and annealing temperature treatment

Fig.4 Different character grain boundaries figures of 825 alloy after deformation at 3% (a, e, i, m), 5% (b, f, j, n), 7% (c, g, k, o), 10% (d, h, l, p) and heat treatment at 1050 ℃ (a~d), 1075 ℃ (e~h), 1100 ℃ (i~l) and 1125 ℃ (m~p)

Fig.5 Different character grain boundaries figure (a) and orientation distribution of grains (b) of grain-cluster C1 in Fig.4a

Fig.6 Effect of cold drawing deformation on grain-cluster size of 825 alloy after annealing at 1050 ℃

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