Grey-Cast Iron-a alloy elements te chanvo .

1. Manganese leh sulfur .
Generally speaking, sulfur is a harmful element. But for gray cast iron, a small amount of sulfur plays a very important role in the refinement of graphite core and cocrystal groups. Therefore, the sulfur content in gray cast iron should not be less than 0.06%, and it is best to keep between 0.06% and 0.08%. If the sulfur content is too high (>0.18%, nghawng tha lo chi hrang hrang a lo lang ang a, casting quality a tichhia ang.
Sulfur hi element a ni a, chemical activity chak tak a nei a. Cast iron-a manganese awm zat a hniam em em a, sulfur leh iron te hian compound FES (melting point 1193℃) an siam a, chubakah iron leh carbon nei low melting cocrystal an siam bawk (Carbon 0.17%, sulfur 31.7%), a bak chu iron, melting point 975℃a ni).
FES hi iron solution-ah a hmin vek thei a ni. Austenite-a iron solidification, sulfur emaw FES emaw a tlem hle a, carbonization solid solution a tlem hle a, liquid phase la awmah chuan zawi zawiin a hausa a, a tawpah sulfide angin a lo chhuak a, cast iron-a sulfur awm zat chu 0.02% a nih chuan independent sulfide a lo lang thei a ni.
Gray cast iron-ah chuan sulfur leh manganese inzawmna hi iron aiin a lian zawk hle a, a hnuaia equation-a kan sawi tawh ang khan MNS siam hi a tam zawk a ni.
Mn+FES MNS + FE 1000 a ni.
MNS melting point chu 1620℃a ni . Grey cast iron-ah chuan MNS hi blue-gray inclusion tenau leh hlauhawm lo tak a ni a, chu chu metal matrix-ah a darh zau a, cast iron processing performance tihchangtlunna leh hmanrua nunna tihchangtlunna kawngah a pui bawk.
Grey cast iron-ah chuan MNS leh FES hian interdissolve a nei thei a, chuvangin compound sulfide (MNFE) S-a manganese leh sulfur awm zat hi a danglam thei a ni. Sulfur leh oxygen te pawh an inzawm khawm thei a, chuvangin gray cast iron ah chuan sulfide dinhmun hi a buaithlak hle a, a chhuak compound te chu fexmnysvow hmangin a entir thei a, chutah chuan x, y, v leh w value te chu cast iron condition bik hmangin a danglam ang.
Tun hnaiah quantitative metallographic analysis hmanga zirchianna chuan MNS leh (MNFE) s inclusions te chu 1cm3 ash cast iron-ah hian maktaduai 43 vel a awm tih a tarlang a, inclusions lian tham tak chu 2~23 micro a ni. Inclusions zawng zawng hi cast iron rit zawng atanga 0.01% aia tlem a ni.
FES emaw ternary co-crystal-a sulfur a awm chuan, solidification kalpui meknaah cocrystal block interface-a liquid phase-ah a inthen a, co-crystal group-te lo thanglian a tikhawtlai a, co-crystal solidification-a supercooling a tipung a, chu chuan cast iron-te hmui varte chu a tipung a ni. Solidification hnuah chuan Cocrystal group ramri-a FES emaw ternary cocrystal emaw chuan cast iron-a mechanical property chu a hniam a, brittleness chu a ti lian ang. Hei hi sulfur-in a tihchhiatna chu a ni.
FES siam chhuah theihna tur leh sulfide telh theihna tur fine leh dispersed sulfide a awm theih nan cast iron-ah manganese tling tawk dah a nih chuan sulfur hian graphite nucleation leh growth-ah hmun tha leh hlawkthlak tak a nei ang. Results Cast iron te tak te crystal te tak te, graphite hi type A a ni a, a hmui var a awm dawn lo. Graphite sheet ang chiah chiah a nih chuan gray cast iron-a sulfur awm zat tlem ber chu 0.06% a ni tur a ni. Sulfur awm zat hi he value aiin a hniam zawk a, cast iron-a graphite sheet sem dan pawh a chhe hle a, hmui var siam pawh a awlsam hle.
Grey cast iron-a manganese hnathawh ber chu sulphur tihkhawtlai leh FES siam tihtawp hi a ni. A chhan chu manganese leh sulfur atomic weight ratio chu 1.71 a nih vang a ni. Cast iron-a manganese leh sulfur siam zat MNS tlukpui ratio chu 1.71 a ni. Equilibrium aiin mangn a sang zawk a, a hmingah 100 a ni.