Acta Metall Sin  2005, Vol. 41 Issue (4): 385-391     DOI:

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Effect Of Isothermal Relaxation On Thermo--Stability Of Non--Equilibrium Microstructure In Microalloyed Steel

WU Huibin; YANG Shanwu; YUAN Shaoqiang;SHANG Chengjia; WANG Xuemin; HE Xinlai

Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083

WU Huibin; YANG Shanwu; YUAN Shaoqiang; SHANG Chengjia; WANG Xuemin; HE Xinlai. Effect Of Isothermal Relaxation On Thermo--Stability Of Non--Equilibrium Microstructure In Microalloyed Steel. Acta Metall Sin, 2005, 41(4): 385-391 .

Abstract References Related Articles Recommended Metrics Download:  PDF(618KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Water cooled treatment after isothermal relaxation of deformed austenite in a Nb--bearing microalloyed steel always induced a bainite ferrite dominated microstructure. Most of strain induced precipitates distribute along dislocations and pin dislocations in sample relaxed for proper time. When these samples were reheated and held at 650 or 700℃, the non--equilibrium microstructures tend to evolve into equilibrium ones. The sample relaxed for 60 s displays the highest thermostability, while the microstructure evolution is the quickest in the sample relaxed for 1000 s even though it is the softest before reheating. Pre--strain before reheating accelerates the evolution process. The evolution of microstructures during reheating and holding consisted of polygonization, small angle boundary between laths disappearing and recrystallization induced polygonal ferrite. Hardness measurement showed two peaks in hardness--time curve of each relaxed sample. These results indicated that thermostability of microstructures are mainly determined by their formation history. Key words:  microalloyed steel      relaxation      strain induced precipitate       Received:  25 May 2004      ZTFLH:  TG111   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors WU Huibin YANG Shanwu YUAN Shaoqiang SHANG Chengjia WANG Xuemin HE Xinlai URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I4/385 [1]Hurley P J, Kelly G L, Hodgson P D. Mater Sci Technol, 2000; 16: 1273 [2]Wang X M, He X L, Yang S W, Shang C J, Wu H B. ISIJ, 2002; 42: 1553 [3]Wang X M, Shang C J, Yang S W, He X L. 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