HEAT-AFFECTED ZONE MICROSTRUCTURE EVOLU- TION AND ITS EFFECTS ON MECHANICAL PROPERTIES FOR LASER CLADDING FV520B STAINLESS STEEL

doi:10.11900/0412.1961.2015.00489

Acta Metall Sin

2016, Vol. 52

Issue (1): 1-9 DOI: 10.11900/0412.1961.2015.00489

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HEAT-AFFECTED ZONE MICROSTRUCTURE EVOLU- TION AND ITS EFFECTS ON MECHANICAL PROPERTIES FOR LASER CLADDING FV520B STAINLESS STEEL

Binshi XU^1,²,Jinxiang FANG^1,²,Shiyun DONG¹(

),Xiaoting LIU¹,Shixing YAN¹,Chaoqun SONG^1,²,Dan XIA¹

1 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
2 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

Cite this article:

Binshi XU,Jinxiang FANG,Shiyun DONG,Xiaoting LIU,Shixing YAN,Chaoqun SONG,Dan XIA. HEAT-AFFECTED ZONE MICROSTRUCTURE EVOLU- TION AND ITS EFFECTS ON MECHANICAL PROPERTIES FOR LASER CLADDING FV520B STAINLESS STEEL. Acta Metall Sin, 2016, 52(1): 1-9.

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Abstract

FV520B steel is a martensitic stainless steel developed by Firth-Vickers, with good corrosion resistance and weldability, high strength and toughness. It has been widely used in heavy load and corrosion-resistant components such as compressor impeller, valves, fasteners and pump shafts, which are easy to be damaged because of severe service-environments. The production cycle of those expensive components are long. If these components can be repaired and remanufactured, the accessional value of the products can be reserved. At the same time, it can save time, resources and funds, and reduce environmental pollutions. Laser cladding is an attractive green reconstruction technology, which is widely used for the remanufacturing of faulty metal parts. However, the heat-affected zone (HAZ) of remanufactured parts will experience cycles of heating and cooling during the cladding operation, its properties will change and may be extremely different than that of the unaffected area of the base material. Hence, the study of HAZ of FV520B steel is essential. The laser cladding on FV520B stainless steel was conducted to investigate the evolutions of microstructure and mechanical property of HAZ. The microstructure of the HAZ was characterized by means of OM and SEM, and hardness distribution was measured. Thermo-simulation was carried out to analyze the continuous cooling transformation (CCT) diagram, which provides useful instructions to investigate the microstructure evolution of HAZ. Simulated HAZ specimens and its mechanical properties were obtained by Gleeble 3500 thermal/mechanical simulator and MTS 810 material testing system. The results indicate that, HAZ can be divided into four zones: semi-melton zone, precipitation dissolved zone, completely austenization zone and partially austenization zone. The microstructures of the HAZ are martensite, the grain grows and second phase particles dissolve in the areas near the fusion zone. Meanwhile, its martensite transformation start temperature lower, and hardness higher than that of the unaffected area of the base material. The maximum temperature of thermal cycle dominates the evolution of microstructure and property of HAZ. With the decrease of the maximum temperature, the solid-state transformation temperature, elongation and impact energy increase, and the hardness decrease. Thermal cycle have a little influence to the tensile strength of HAZ under the processing parameters in this study. It can be speculated that the reduction in impact toughness and elongation of the HAZ can be controlled by decreasing the scanning speed of cladding.

Key words: laser cladding heat-affected zone martensitic stainless steel structural transformation

Received: 18 September 2015

Fund: Supported by National Basic Research Program of China (No.2011CB013403) and National Key Laboratory for Remanufacturing Fund (No.9140C85040314OC85353)

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	Binshi XU
	Jinxiang FANG
	Shiyun DONG
	Xiaoting LIU
	Shixing YAN
	Chaoqun SONG
	Dan XIA

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00489 OR https://www.ams.org.cn/EN/Y2016/V52/I1/1

Fig.1 Schematic of tensile specimen (unit: mm)

Fig.2 OM images of heat-affected zone (HAZ) of FV520B steel treated by laser cladding (a), and enlarged views of zone A (semi-melton zone) (b), zone B (precipitation dissolved zone) (c), zone C (completely austenization zone) (d), zone D (partially austenization zone) (e) and zone E (f) in Fig.2a

Fig.3 Microhardness of HAZ in laser cladding sample

Fig.4 Continuous cooling transformation curves of FV520B stainless steel for Case I (a) and Case II (b) (M_s—start temperature of martensite transformation)

Fig.5 OM images of Case I specimen under cooling rates of 0.02 ℃/s (a), 0.2 ℃/s (b), 0.5 ℃/s (c) and 1 ℃/s (d)

Fig.6 OM images of Case II specimen under cooling rates of 0.02 ℃/s (a), 0.2 ℃/s (b), 0.5 ℃/s (c) and 1 ℃/s (d)

Fig.7 M_s (a) and microhardness (b) of Case I and Case II specimens

Fig.8 Typical tensile curves of FV520B steel and simulated HAZ specimens

Fig.9 Fractographs of FV520B steel (a), Case I (b) and Case II (c) specimens

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