Ngemuva kokukhulisa, ukuguqula isimo, ukucima, ukuguquguquka nokuguqulwa komhlaba okuvuthayo, okuthethelelwa kungakhiqiza ukuhlanekekekelwa kwekwelashwa okushisayo.

Imbangela yokuhlanekezela ukucindezelwa kwangaphakathi kokusolwa ngesikhathi sokwelashwa okushisa, okungukuthi, ukucindezela kwangaphakathi kwalokhu okusolwa ngemuva kokwelashwa okushisa kuhlala ngenxa yokwelashwa okushisa kuhlala ngenxa yokwelashwa okuphakathi nangaphandle nangaphandle kwenguquko yesakhiwo.

Lapho le ngcindezi idlula iphuzu lesivuno lensimbi ngesikhathi esithile ngesikhathi sokwelashwa okushisa, kuzodala ukuhlanekezela kwalokhu kwakha.

Ukuxineka kwangaphakathi okukhiqizwa kwinqubo yokwelashwa okushisa kufaka phakathi ukucindezelwa okushisayo kanye nokushintsha kwesigaba.

1. Ukucindezela okushisayo
Lapho lokhu kufungiswa kufudunyezwa futhi kupholile, kuhambisana nesikhathi sokwandisa okushisayo kanye nokukhishwa okubandayo. Lapho ingaphezulu kanye nomnyombo kwalokhu kuthethelela kufudunyezwa noma kupholile ngejubane elihlukile, okuholela umehluko wokushisa, ukunwebeka noma ukukhishwa kwevolumu nakho kuhlukile kwale ndawo kanye nomnyombo. Ukucindezela kwangaphakathi okubangelwa izinguquko ezihlukile zevolumu ngenxa yomehluko wokushisa ibizwa ngokuthi ukucindezelwa okushisayo.
Esezinhlelweni zokwelashwa okushisa, ukucindezela okushisayo kwalokhu kwaziswa kubonakaliswa ikakhulukazi njengoba: Lapho lokhu kuvuselelwa, izinga lokushisa elingaphezulu liphezulu futhi linwebeka, okwamanje alikhuphukile ukucindezelwa kwengcindezi ebusweni.
Ngemuva kwe-diathermy, izinga lokushisa eliyisisekelo kukhuphuka futhi kwanda ukwanda. Ngalesi sikhathi, ukucebisisa kukhombisa ukwanda kwevolumu.
Ukusebenza Kokupholisa, indawo epholile esheshayo kune-core, i-shrinkage engaphezulu, izinga lokushisa eliphakeme lenhliziyo ukuvikela ukucindezela okuqhubekayo, lapho inciphise ukucindezelwa okuqhubekayo, ngenkathi kuphoqeke ukucindezela okuqhubekayo, ngenkathi kuphoqeka ukucindezela okuqhubekayo, ngenkathi kuphoqeka ukucindezela okuqhubekayo, ngenkathi kunengcindezi yokuxineka, lapho kuqhubeka khona ingxoxo yokuphola kusekhona ngaphakathi kokupholisa kanye kubhekiswe kuyo njengengcindezi eyinsalela.

2. Isigaba Shintsha Ukucindezela

Esezinhlelweni zokwelashwa okushisa, isisindo kanye nevolumu yokwenziwa kwevolumu kumele kushintshe ngoba isisindo kanye nevolumu yezakhiwo ezahlukahlukene zihlukile.
Ngenxa yomehluko wokushisa phakathi kobuso nomnyombo wezomnotho, ukuguqulwa kwezicubu phakathi kobuso kanye nomgogodla akusona ngesikhathi, ngakho-ke ukucindezela kwangaphakathi kuzokwenziwa lapho kuvela ukucindezela kwevolumu kanye noshintsho lwevolumu.
Lolu hlobo lokuxinzeka kwangaphakathi olubangelwa umehluko wezinguquko zezicubu lubizwa ngokuthi yiSigaba Shintsha Ukuxineka.

Amavolumu amaningi ezakhiwo ezisisekelo ensimbi andiswe ngokulandelana kwe-auntenitic, Pearlite, Soustenitic, Toostite, Hypobainite, osolwa kanye ne-martensite kanye neMferensite.
Ukwenza isibonelo, lapho lokhu kucishwa kuqedwe futhi kusolwa ngokushesha, ungqimba olungaphezulu luguqulwa kusuka ku-Autenite kuya ku-Martensite futhi ivolumu iyandiswa, kepha inhliziyo isezingeni eliphezulu, ivikela ukwanda kwesendlalelo se-autentite. Ngenxa yalokho, inhliziyo yalokho kwaziswa ifakwa ekucindezelweni okuthe xaxa, kuyilapho ungqimba olungaphezulu lucindezelwa.
Lapho iqhubeka nokupholisa, izinga lokushisa elingaphezulu liyehla futhi alisakhuli, kepha ivolumu yenhliziyo iyaqhubeka nokugqwayiza njengoba ishintsha ebusweni, ngakho-ke inhlonipho incane ukucindezelwa, futhi ingaphezulu libhekwe ekucindezelekeni okucindezelayo.
Ngemuva kokupholisa ifindo, le ngcindezi izohlala ngaphakathi kwababiyo futhi ibe yingcindezi eyinsalela.

Ngakho-ke, ngesikhathi senqubo yokucisha nokupholisa, ukucindezela okushisayo kanye nokucindezela kokuguquguquka kwesigaba kuphambene, futhi lezi zingcindezi ezimbili ezisele ekuthethelweni nazo zibhekene.
Ukuxineka okuhlanganisiwe kokucindezelwa kwengcindezi eshisayo kanye nokuxineka kwesigaba kubizwa ukuqeda ukucindezela kwangaphakathi.
Lapho ukucindezelwa kwangaphakathi okusele ekubumbeni kudlula iphuzu lesivuno lensimbi, umsebenzi wokwakha uzokhiqiza ipulasitiki, okuphumela ekuhlanekezinisweni.

(Kusuka ku: 168 Uthethelela inetha)