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자료유형
학술저널
저자정보
저널정보
대한용접·접합학회 International Journal of Korean Welding Society International Journal of Korean Welding Society Vol.3 No.2
발행연도
2003.12
수록면
40 - 45 (6page)

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A series of experiments has been carried out to investigate the effect of titanium, boron and nitrogen on the microstructure and toughness of simulated heat affected zone (HAZ) in quenched and tempered (QT) type 490MPa yield strength steels. For acquiring the same strength level. the carbon content and carbon equivalent could be lowered remarkably with a small titanium and boron addition due to the hardenability effect of boron during quenching process. Following the thermal cycle of large heat input, the coarsened grain HAl (CGHAl) of conventional quenched and tempered (QT) type 490MPa yield strength steels exhibited a coarse bainitic or ferrite side plate structure with large prior austenite grains. While, titanium and boron bearing QT type 490MPa yield strength steels were characterized by the microstructure in the CGHAZ, consisting mainly of the fine intragranular ferrite microstructure. Toughness of the simulated HAl was mainly controlled by the proper Ceq level, and the ratio of Ti/N rather than titanium and nitrogen contents themselves. In the titanium-boron added QT steels, the optimum Ti/N ratio for excellent HAl toughness was around 2.0, which was much lower than the known TilN stoichiometric ratio, 3.4. With reducing Ti/N ratio from the stoichiometric ratio, austenite grain size in the coarse grained HAZ became finer, indicating that the effective fine precipitates could be sufficiently obtained even with lower TiIN level by adding boron simultaneously. Along with typical titanium carbo-nitrides, various forms of complex titanium- and boron-based precipitates, like TiN-MnS-BN, were often observed in the simulated CGHAl, which may act as stable nuclei for ferrite during cooling of weld thermal cycles.

목차

Abstract

1.Introduction

2.Experimental procedures

3.Results and discussion

4.conclusion

References

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