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焊后热处理对05Cr17Ni4Cu4Nb钢焊接接头组织与性能的影响.pdf

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35 11 Vol35 No11 2010 11 HEAT TREATMENT OF METALS November 2010 05Cr17Ni4Cu4Nb , , , , , (西安热工研究院有限公司, 陕西 西安 710032) : 05C r17N i4C 4Nb , 540 , 05C r17N i4C 4Nb, ; 600 , , ; 6~ 7 mm ; , : ; ; 05C r17N i4C 4Nb; : TG142; TK265 :A : 2010) Effect of postwel heat treatment onm icrostructure an mechanical properties of 05Cr17Ni4Cu4Nb steelwel joint LIU F g ang, LITaijiang, WANG Caix ia, LIW ei, YAO B ingyin, TANG L iying ( Xi an Therm al Pow er Research Instit te, X i an Shaanxi 710032, China) Abstract: M icrostr ct re and m echan ical properties of the w eld joints of 05Cr17N i4C 4Nb precip itation hardening stain less steel sed in steam t rb ine low press re blade w ere investigated thro gh m echan ical test, optical m icroscope and scann ing electron m icroscope. Res lts show that the weld join ts of 05C r17N i4C 4Nb steel has higher strength and low mi pact to ghness after aging at 540 and the strength decreases and the mi pact to ghness ofw eld m etal mi provesw ith the aging tem perat re increasing to 600 . There exists a hardnessm in mi m in HAZ from the f sion line abo t 6 ~ 7 mm in d irect aged w eld joints. Both high strength and enhanced mi pact to ghness are obtained thro gh resol tion and aging treatm ent. The m ain reason for the w eld m etal mi pact to ghness mi provem en t is associated w ith change of m icrostr ct re and fract re m echan ism transition. K ey wor s: postw eld heat treatm ent( PWHT); blade; 05Cr17N i4C 4Nb precip itation harden ing steel; w eld joint 05Cr17N i4C 4Nb ( 174PH ) , , , , C , , [ 1] , ,
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