CAJ | 학술논문

对中型42 CrMo钢差速器壳锻件进行了形变淬火和高温回火的形变热处理。主要的工艺过程：将坯料在中频炉中加热至1100～1150℃，总变形量为47．4％的锻造，风冷30～60 s至950～1000℃，在PAG水溶液中淬火10 min以上。结果，差速器壳锻件的力学性能明显高于普通热处理件，还简化了工序，缩短了生产周期，降低了能耗和生产成本。形变淬火提高零件力学性能的机制是，形变淬火马氏体板条束的直径远小于普通淬火马氏体，而且除相变强化外，还有位错强化和亚晶强化效果。
대중형42 CrMo강차속기각단건진행료형변쉬화화고온회화적형변열처리。주요적공예과정：장배료재중빈로중가열지1100～1150℃，총변형량위47．4％적단조，풍랭30～60 s지950～1000℃，재PAG수용액중쉬화10 min이상。결과，차속기각단건적역학성능명현고우보통열처리건，환간화료공서，축단료생산주기，강저료능모화생산성본。형변쉬화제고령건역학성능적궤제시，형변쉬화마씨체판조속적직경원소우보통쉬화마씨체，이차제상변강화외，환유위착강화화아정강화효과。
The middle-sized differential shell forging , made from 42CrMo steel, was thermal-mechanically treated, i.e.was ausform hardened and high temperature tempered .The ausform hardening process consists of heating the blank to 1100 to 1150 ℃in medium-frequency induction furnace , forging to total deformation amount of 47.4%, air cooling for 30 to 60 s to 950 to 1000℃, and quenching in PAG solution for more than 10 min.As a result, the mechanical properties of the differential shell forging are appreciably increased relative to those of the differential shell forging conventionally heat treated .Besides , the production process is simplified , the production period is shortened , and the energy consumption and manufacturing cost are decreased . Increase in the mechanical properties of the forging is attributed to much smaller diameter of martensite lath developed by ausform hardening than that of martensite lath developed by conventional hardening as well as to dislocation strengthening and sub -grain strengthening in addition to transformation strengthening .