Mo对双相钢过冷奥氏体连续冷却转变的影响

EFFECT OF Mo ON CONTINUOUS TRANSFORMATION OF OVERCOOLED AUSTENITE FOR DUAL PHASE(DP)STEEL

Mo是1000 MPa级高强双相钢常用的合金元素。为了考察Mo元素对双相钢过冷奥氏体连续冷却转变的影响规律,利用光学显微镜和淬火膨胀仪,分别对不同Mo含量的含硼及含铬双相钢的静态过冷奥氏体连续冷却转变曲线(静态CCT曲线)进行了测定和比较。结果表明,Mo元素能够缩小过冷奥氏体的高温转变区域,并使高温转变和中温转变区域分离;同时,可以缩小贝氏体转变区域,并在一定程度上抑制贝氏体转变,从而提高淬透性。

Molybdenum(Mo)is a commonly used alloy element in 1000 MPa high strength dual phase(DP)steel.In order to investigate the effect of Mo on the continuous cooling transformation of overcooled austenite in dual phase steel,the static continuous cooling transformation curves(static CCT curves)of overcooled austenite in boron and chromium containing dual phase steels with different Mo content was measured and compared by optical microscope and thermal dilatometer.The results indicated that Mo can reduce the high temperature transformation region of overcooled austenite and separate the high temperature transformation region from the medium temperature transformation region.In addition,Mo can reduce the bainite transformation region and inhibit the bainite transformation to a certain extent,so as to improve the hardenability.