瞬态相变热分析计算无法收敛

模型：两端封口的钢管内装铝合金，然后置于1273K的恒温热空气中。想要模拟铝合金在熔化（相变）过程中的温度分布情况及全部熔化所需时间。
问题：设置分析时间为1500s，但是在计算无法收敛，请高手们指导一下，问题目出在哪里？
log如下：
/BATCH
/COM,ANSYS RELEASE 10.0 UP20050718 20:40:40 11/12/2008
/input,menust,tmp,'',,,,,,,,,,,,,,,,1
/GRA,POWER
/GST,ON
/PLO,INFO,3
/GRO,CURL,ON
/CPLANE,1
/REPLOT,RESIZE
WPSTYLE,,,,,,,,0
/FILNAME,Guan,0
/PREP7
!*
ET,1,SOLID70
!*
*SET,DEN1,7850
*SET,C1,460
*SET,LB1T1,0
*SET,LB1T2,100
*SET,LB1T3,200
*SET,LB1T4,300
*SET,LB11,44.8
*SET,LB12,42.2
*SET,LB13,39.3
*SET,LB14,36.4
*SET,LB2T1,0
*SET,LB2T2,100
*SET,LB2T3,300
*SET,LB2T4,400
*SET,LB2T5,500
*SET,LB21,204
*SET,LB22,205
*SET,LB23,230
*SET,LB24,249
*SET,LB25,267
*SET,EN2T1,100
*SET,EN2T2,576
*SET,EN2T3,578
*SET,EN2T4,700
*SET,EN21,0
*SET,EN22,1.2704e9
*SET,EN23,2.512e9
*SET,EN24,3.1586e9
*SET,R,0.08
*SET,d,0.003
*SET,L,0.4
*SET,AA,0
*SET,AB,30
*SET,h1,120
*SET,T,1000
*SET,T1,25
*SET,T2,225
*SET,LEN,0.004
*SET,TMAX,1500
*SET,TMIN,10
*SET,MIST,10
*SET,MAST,20
ALLSEL,ALL
SAVE
/REPLOT,RESIZE
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,DEN1
MPTEMP,,,,,,,,
MPTEMP,1,LB1T1
MPTEMP,2,LB1T2
MPTEMP,3,LB1T3
MPTEMP,4,LB1T4
MPDATA,KXX,1,,LB11
MPDATA,KXX,1,,LB12
MPDATA,KXX,1,,LB13
MPDATA,KXX,1,,LB14
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,C,1,,C1
MPTEMP,,,,,,,,
MPTEMP,1,LB2T1
MPTEMP,2,LB2T2
MPTEMP,3,LB2T3
MPTEMP,4,LB2T4
MPTEMP,5,LB2T5
MPDATA,KXX,2,,LB21
MPDATA,KXX,2,,LB22
MPDATA,KXX,2,,LB23
MPDATA,KXX,2,,LB24
MPDATA,KXX,2,,LB25
MPTEMP,,,,,,,,
MPTEMP,1,EN2T1
MPTEMP,2,EN2T2
MPTEMP,3,EN2T3
MPTEMP,4,EN2T4
MPDATA,ENTH,2,,EN21
MPDATA,ENTH,2,,EN22
MPDATA,ENTH,2,,EN23
MPDATA,ENTH,2,,EN24
ALLSEL,ALL
SAVE
/VIEW,1,1,2,3
/ANG,1
/REP,FAST
CYLIND,R+d,R,d,L+d,AA,AB,
CYLIND,R+d,R,0,d,AA,AB,
CYLIND,R,0,0,d,AA,AB,
CYLIND,R+d,R,L+d,L+2*d,AA,AB,
CYLIND,R,0,L+d,L+2*d,AA,AB,
CYLIND,R,0,d,L+d,AA,AB,
FLST,2,6,6,ORDE,2
FITEM,2,1
FITEM,2,-6
VGLUE,P51X
ALLSEL,ALL
SAVE
FLST,5,5,6,ORDE,3
FITEM,5,1
FITEM,5,8
FITEM,5,-11
CM,_Y,VOLU
VSEL, , , ,P51X
CM,_Y1,VOLU
CMSEL,S,_Y
!*
CMSEL,S,_Y1
VATT, 1, , 1, 0
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
CM,_Y,VOLU
VSEL, , , , 7
CM,_Y1,VOLU
CMSEL,S,_Y
!*
CMSEL,S,_Y1
VATT, 2, , 1, 0
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
ESIZE,LEN,0,
ALLSEL,ALL
SAVE
FLST,5,3,6,ORDE,3
FITEM,5,1
FITEM,5,10
FITEM,5,-11
CM,_Y,VOLU
VSEL, , , ,P51X
CM,_Y1,VOLU
CHKMSH,'VOLU'
CMSEL,S,_Y
!*
MSHAPE,0,3d
MSHKEY,1
VMESH,_Y1
MSHKEY,0
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
FLST,5,3,6,ORDE,2
FITEM,5,7
FITEM,5,-9
CM,_Y,VOLU
VSEL, , , ,P51X
CM,_Y1,VOLU
CHKMSH,'VOLU'
CMSEL,S,_Y
!*
VSWEEP,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
ALLSEL,ALL
SAVE
ALLSEL,ALL
SAVE
FINISH
/SOL
FLST,2,7,5,ORDE,7
FITEM,2,3
FITEM,2,7
FITEM,2,19
FITEM,2,38
FITEM,2,42
FITEM,2,48
FITEM,2,-49
/GO
!*
SFA,P51X,1,CONV,h1,T
ESEL,S,MAT,,1
EPLOT
NSLE,S
NPLOT
FLST,2,2904,1,ORDE,6
FITEM,2,1
FITEM,2,-2744
FITEM,2,6606
FITEM,2,-6686
FITEM,2,6786
FITEM,2,-6864
IC,P51X,TEMP,T1,
ALLSEL,ALL
EPLOT
ESEL,S,MAT,,2
EPLOT
NSLE,S
NPLOT
FLST,2,12120,1,ORDE,14
FITEM,2,2
FITEM,2,-13
FITEM,2,37
FITEM,2,-48
FITEM,2,1237
FITEM,2,-2424
FITEM,2,2541
FITEM,2,-2676
FITEM,2,2745
FITEM,2,-6605
FITEM,2,6646
FITEM,2,-6824
FITEM,2,6865
FITEM,2,-13596
IC,P51X,TEMP,T2,
ALLSEL,ALL
EPLOT
SAVE
!*
ANTYPE,4
!*
TRNOPT,FULL
LUMPM,0
!*
!*
TIME,TMAX
AUTOTS,1
DELTIM,TMIN,MIST,MAST,1
KBC,1
!*
TSRES,ERASE
!*
OUTRES,ERASE
OUTRES,ALL,ALL
/STATUS,SOLU
SOLVE
FINISH
/PREP7
FINISH
/SOL
!*
TIME,1500
AUTOTS,1
DELTIM,TMIN,MIST,MAST,1
KBC,1
!*
TSRES,ERASE