耐磨耐蚀钢发展途径的探索

在双相不锈钢研究基础上，探索了耐磨耐蚀合金组织与腐蚀、磨损、冲蚀性能的关系．腐蚀介质中外加极化电位下的销环磨损试验、料浆及水砂冲蚀和磨痕观测结果表明：控制合金成分及组织以提高其综合性能，并充分发挥形变强化能力是发展耐磨耐蚀合金的正确途径，第二相强化只要应用得当也有一定效果．

CD-4MCu合金在磷酸介质中的腐蚀磨损行为

测定了CD—4MCu合金在69％H_3PO_4,69％H_3PO_4+500ppm NaCl介质中的腐蚀率、腐蚀磨损—载荷关系及摩擦系数,还用SEM观察了磨痕,实验表明它的耐腐蚀磨损性能优于一般的304不锈钢和高耐蚀的Carpenter20Cb3合金,从CD—4MCu合金双相组织特点可知其中低Ni的面心立方γ相有较高的抗磨损能力。

钢的显微组织对Cd脆敏感性的影响

本文采用30CrMnSiNi2A钢在等屈服强度条件下对比不同显微组织与Cd脆的敏感性。结果表明,回火马氏体(M_T)的Cd脆敏感性最大,(M_T+B_L)混合组织次之,下贝氏体(B_L)最小。

Variation in Creep Rupture of γ′ Strengthened Superalloys with Stacking Fault Energy of Matrices

The correlation between the creep rupture behaviour and the stacking fault energy of matrices of γ′strengthened superalloys has been studied dur- ing constant load creep.At high temperature and intermediate stress,the creep rupture time and strain strongly depend on the stacking fault energy of matrices rather than the creep friction stress,but at higher stress,the role of grain boundary carbides becomes more obvious. However,in the considerably extensive stress range investigated here,the mean creep rate is a power function of the stacking fault energy of matrices and the power index decreases with in- creasing initial applied stress.Particularly,at inter- mediate stresses the product of this index and the initial applied stress compensated by the shear modulus is same for two series of superalloys. Hence,this product may be a criterion predicting that the matrix deformation controls high tempera- ture creep rupture.