相变诱发塑性锚杆材料控冷热处理组织与性能

Microstructure and Property of the Controlled Cooling HeatTreatment of TRIPBolt Steel

研究了可用做超高强度锚杆材料的高碳Ｓｉ－Ｍｎ系ＴＲＩＰ钢的控冷热处理显微组织和力学性能，结果表明：经控冷后得到的显微组织主要是板条状的贝氏体和１６％～１０％的残留奥氏体，板条贝氏体的亚结构为高密度位错．在延伸率≥１４％的条件下，其屈服强度可以达到９９０～１３８０ＭＰａ，抗拉强度可达１１６０～１５３０ＭＰａ，在相同塑性水平下，比现用锚杆的强度有大幅度的提高。

The microstructure and property of controlled cooling heattreatment for high carbon SiMn TRIP steel that may be used to make superstrength bolt have been studied. The research results show that bainite in lath and retained austenite (16%￣10%V) are mainly obtained under controlled cooling. The substructure of bainite in lath is high density dislocation. Under total elongation14%,its yield and tensile strength can respectively reach 990￣1 380 MPa and 1 160￣1 530 MPa,and are very higher than that of bolts now available.It will be best suited to make a superstrength bolt.