Influence of laser processing parameters on the case-depth and the hardness

WU Gang; SONG Guang-ming; HUANG Wan-juan

Both from experiments and theoretical analysis,the influenceof laser processing parameters on the case-depth and the hardness in laser quenching was studied.Under the condition of equal input laser energyand different laser power and scanning velocity,the variation of the case-depth and the hardness was measured.Measurement results show that the change of both the laser power and the scanning velocity can affect the case-depth and the hardness obviously and the change of laser power affects the case-depth more significantly.On the other hand,the change of either the laser power or the scanning velocity has a little influence on the hardness.Correspondingly,the change of the scanning velocity has a little more influence on the hardness.By means of analytical simulation of the temperature distribution and the heating/cooling rates under the laser scanning,reasonable explanation for the results was put forward.

1. Institute of Laser Application, Shanghai Maritime University, Shanghai 200135, China

Received Date: 2006-01-17

Accepted Date: 2006-03-21

Available Online: 2007-04-25

Abstract: Both from experiments and theoretical analysis,the influenceof laser processing parameters on the case-depth and the hardness in laser quenching was studied.Under the condition of equal input laser energyand different laser power and scanning velocity,the variation of the case-depth and the hardness was measured.Measurement results show that the change of both the laser power and the scanning velocity can affect the case-depth and the hardness obviously and the change of laser power affects the case-depth more significantly.On the other hand,the change of either the laser power or the scanning velocity has a little influence on the hardness.Correspondingly,the change of the scanning velocity has a little more influence on the hardness.By means of analytical simulation of the temperature distribution and the heating/cooling rates under the laser scanning,reasonable explanation for the results was put forward.

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Reference (10)

[1]	GUAN Zh Zh.The handbook of laser processing[M].Beijing:China Metrology Publishing House,1998.6(in Chinese).
[2]	LIU J L,ZHOU Zh R,SU B R.Heat treatment by high energy[M].Beijing:China Machine Press,1997.8(in Chinese).
[3]	LIU Zh Y,ZHANG K K,WANG Ch Sh et al.Effect of laser hardening technical parameters on hardened depth of 40Cr steel[J].Laser Technology,2002,26(4):262～264(in Chinese).
[4]	WU G,CHEN B S.Effects of laser scanning parameters on the uniformity of hardened case distribution[J].Transactions of Materials and Heat Treatment,2003,24(3):84～87(in Chinese).
[5]	SENTHIL S J,SUBRAMANIN K,NATH A K.Effect of laser surface hardening on En18(AISI 5135) steel[J].Journal of Materials Processing Technology,1999,91(1):29～36.
[6]	DEPREZ P,COUTOULY J F,CRAMPON J et al.Surface transformation hardening of steels with CW CO2 laser[J].Lssers in Engineering,1999,8(2):105～117.
[7]	ION J C.Laser transformation hardening[J].Surface Engineering,2002,18(1):14～31.
[8]	LEVCOVICI S M,LEVCOVICI D T,MUNTEANU V et al.Laser surface hardening of austenitic stainless steel[J].Journal of Materials Engineering and Performance,2000,9(5):536～540.
[9]	YILBAS A S,SHUJA S Z,SAMI M.Thermal analysis of laser heat treated engineering alloys[J].Surface Engineering,1997,13(2):149～156.
[10]	CHEN T L,GUAN Y H,WANG H G et al.Study on austenite transformation during laser heating[J].Journal of Materials Processing Technology,1997,63(1～3):546～549.

Influence of laser processing parameters on the case-depth and the hardness

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References

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