Heat treatment effect on ledeburite alloys wear resistance

Формирование Диссипативной Структуры Метастабильного Аустенита Для Повышения Износостойкости Углеродистых Сталей

“…Òàê, íà ïðèìåðå ñòàëåé ïåðëèòíîãî è ëåäåáóðèòíîãî êëàññîâ 150ÕÍÌË è Õ12ÌË ïîêàçàíî, ÷òî â ðåçóëüòàòå çàêàëêè îò ñòàíäàðòíîé òåìïåðàòóðû (850 °C) îáðàçóåòñÿ ìèêðîñòðóêòóðà ìåëêîèãîëü÷àòîãî ìàðòåíñèòà ñ èçáûòî÷íûìè êàðáèäàìè, êîòîðàÿ îáåñïå÷èâàåò èõ âûñîêóþ òâåðäîñòü (³ 60 ÍRC ). Îäíàêî ìàêñèìàëüíàÿ èçíîñîñòîéêîñòü ýòèõ ñòàëåé ïðè àáðàçèâíîì èçíàøèâàíèè äîñòèãàåòñÿ ïîñëå âûñîêîòåìïåðàòóðíîé çàêàëêè (îò 1100 -1175 °C), â ðåçóëüòàòå êîòîðîé ôîðìèðóåòñÿ ìàðòåíñèòíî-êàðáèäíàÿ ñòðóêòóðà ñ ìåòàñòàáèëüíûì àóñòåíèòîì [10,17,19,20,23]. Çíà-÷èòåëüíûé èíòåðåñ â ïîñëåäíèå äåñÿòèëåòèÿ ïðèîáðåëè ðàáîòû ïî èçó÷åíèþ âîçìîaeíîñòè èñïîëüçîâàíèÿ ìåòàñòàáèëüíîãî àóñòåíèòà êàê ñòðóêòóðíîé ñîñòàâëÿþùåé âûñîêîóãëåðîäèñòûõ ñòàëåé ïåðëèòíîãî è ëåäåáóðèòíîãî êëàññîâ äëÿ ïîâûøåíèÿ èõ ñîïðîòèâëåíèþ àáðàçèâíîìó èçíàøèâàíèþ ïðè íåòðàäèöèîííîé òåðìè÷åñêîé îáðàáîòêå.…”

“…Ðàçìåð ÿ÷ååê, îêðóaeåííûõ ýâòåêòèêîé, îñòàåòñÿ ïîñòîÿííûì è ñîñòàâëÿåò ~20 -30 ìêì (ðèñ. 2, å, ae, ç ) [20,23]. Ñ ïîâûøåíèåì òåìïåðàòóðû íàãðåâà ïîä çàêàëêó ñòðóêòóðà ñòàëè 95Õ18 ñóùåñòâåííî èçìåíÿåòñÿ: äî 1000 °C â ñòðóêòóðå ñîäåðaeèòñÿ âûñîêîäèñïåðñíûé ìàðòåíñèò (ñêðûòîêðèñòàëëè÷åñêèé èëè áåññòðóêòóðíûé) è êàðáèäû -ïåðâè÷íûå, âûòÿíóòûå âäîëü ïðîêàòêè, è âòîðè÷íûå (ðèñ.…”

Improving the Wear Resistance of Ledeburitic Tool Steels by a Combination of Semi-Solid and Cryogenic Processing

“…Therefore, new materials, processing methods, or surface treatments are constantly being sought to obtain materials with higher wear resistance. Mostly, materials with a higher fraction of uniformly dispersed fine carbides in a martensitic matrix with a small fraction of metastable retained austenite are being sought [1,2]. Such materials are used in a wide range of applications, such as mining, metallurgy, road building, drilling, and other industries.…”