Babbangami bututuƙarfafa nakasawa shine amfani da hanyoyin ƙarfafa ƙarfe.Har ila yau, an san shi da hardening ko damuwa.Ƙarfin abu a macro (ko gaba ɗaya) ikon tsayayya da nakasawa (ko damuwa mai gudana).Taurin shine ikon kayan don tsayayya da nakasar filastik (ko taurin, taurin Vickers, hardness Rockwell ko Brinell).Dukansu suna da alaƙa mai kama da juna a lokuta da yawa.Ƙarfin kayan, mafi girman juriya na lalata filastik, mafi girman ƙimar taurin.Sabanin haka, mafi girman taurin kayan, kayan na iya zama saboda ƙãra brittleness, ƙarfinsa bai cika nunawa a cikin irin wannan ƙarfin index darajar ba high.

Domin ya fi tsayi da zafi magani, da kuma yin amfani da kayan a yanayin zafi da kyau a kasa da recrystallization zafin jiki na gami tube high-matsi karfe bututu abu, sau da yawa amfani da sanyi (sanyi nakasawa) yana nufin yin shi ta hanyar nakasawa ƙarfafa don inganta ƙarfi.Saboda haka, nakasawa ƙarfafa jigon recrystallization zafin jiki na kayan da wadannan sanyi nakasawa, tare da matakin nakasawa (dariya) ya karu, sakamakon wani babban yawa na dislocations (crystal lahani), mafi girma da dislocation yawa a cikin crystal, mafi girma. mataki na haɓakawa, mafi girman damuwa mai gudana.Bayan nakasawa kwarara danniya na karfe bututu kada ya zama daidai kafin kwarara danniya nakasawa ƙarfafa nakasawa tare da karuwa kwarara danniya.Amfani da nakasawa ƙarfafa don cimma high ƙarfi karfe kayayyakin, shi ne na hali high-carbon karfe sanyi-ja karfe waya da low-carbon low-alloy duplex karfe sanyi-ja karfe waya.

Tare da matakin nakasawa yana ƙaruwa, ƙarfin kayan abu da taurin ya fi girma kuma mafi girma, amma ductility da taurinsa sau da yawa suna raguwa da ƙasa, ƙara karuwa, wanda ke buƙatar ɗaukar matakai masu tsauri don inganta yanayin.Ciki wanda aka jawo a cikin canjin lokaci na martensitic yayin lokacin sanyaya don taurara, ainihin zahirinsa, shima yana cikin ƙarfafa nakasawa, amma wannan lokacin ba daga nakasar waje ba, amma daga aiwatar da canjin martensitic na kristal high-yawan bit kanta karfi wanda aka yi ta kuskure. .