182page

17O ^1198 tr -st=el 4! cczl+ola, tr? e-271+ rJ3o/oc eir}q "Jt rlHl4oltr_(€ "J^J rlfl4oltre+ €e-lolg) =4olq, trB 9-2slg +tlg+ EB(spheroidizing annealing) + +^J ^lHl 4olE(14 B ol ^ld4ol E, 7)zl= 9l4olq) =zl ol4. r aJ 9-27 "J8 ,\l El Elo lE( x 250) ral 9-28 +d| ^lE! ElolE( x 400) (6) Z]l€€ EB aElqq *e ^J4ql 9l= 4E= zlac *s oltlo -s EB6IE rtl#l aqlol S= pCol ^JCqq olrJ tEIzI 6lli 89tr^l ,Jg rCr+ "J^Jg 4rl ,*Al €+. zl443s. r*E Edtfzl. olq4 +Be ?lzlql E6Iq a++€trI. 7l* +,q.J "3 6Jg Er+.J*+ (s e_s)ol +Elt EIe+ ?ol HBEE a7l foltrl. zl€c gE= H€EE ^J+4 e, rlE ts.z1 ?zlBql 44 at€4. Hle'+,Jql^] T*9 "JHl4 o E 450_600"C, +7J_r-J+zlollr..lE 0OO-800 C z3 Sol4. E 9-5 'JZJEgSoll rclE Tn("C)el EAI trB g-zs)Y o.oeo/oc tsl 6]A119=_ gooto tsz] "JE6Iq 7Ig+ + +ElU e4H+tr (a)E 550C zlzl 7Ig 6IE =q t d^J H B =zl ol BoI9l4. (b). 600"c zlzl 7Ig 6I E =qu elzlolg 44 ql+ql + Bg a-a- 4Le 4?col ^llE cc€trI. ol40l zlaaolrl s49E _ +4+= 4o14. (c)E 650c_tr 7Ig+ +E dAIHB=4g , ' ,N E4 CCg aes.E q rBqr 849 HBzl]e4e E+al €+. ezlg ele-lolg 4Eil LIql rld4ol e7l +^Jstr €4*4. (d)= zlggE= 700"c _ E g4E EA E .Jz}=rlJslzl- "Jq+q, zlggsz1 olzl Acld ol6}ql il9yE rldr-loleE + HEE.(%) 10 20 40 70 E6tltr 0.047" cEE 490 700 450 590 425 510 420 470