Trace of B and Ga can substitute for Mo in Mn-Si-Cr dual phase steels.The technological process and CCT curves of steels treated with B and Ga are similar to those for Mn-Si-Cr-Mo steel.
Two kinds of C-Si-Mn-Cr series tested steels were designed to obtain dual phase microstructures of ferrite （F） ＋martcnsite （M） or ferrite （F）-bainite （B） with different mechanical properties. Effects of stren...Two kinds of C-Si-Mn-Cr series tested steels were designed to obtain dual phase microstructures of ferrite （F） ＋martcnsite （M） or ferrite （F）-bainite （B） with different mechanical properties. Effects of strengthening phase on yielding and fracture behaviours during uniaxial tension of dual phase steel were discussed. Compared with hot-rolled martensite dual phase steel, ferrite-bainite dual phase steel has high ratio of yield strength to tensile strength （YS/TS） and low elongation. During necking process of uniaxial tension, microvoids of ferrite-martensite steel are generated by fracture of ferrite/martensite boundary or martensite islands with irregular shape. But ferrite matrix elongated remarkably along deformation direction, and strengthening phase also coordinated with ferrite matrix. Compatible de formation between ferrite and bainite is distinct. Ferrite-bainite dual phase steel has fine and less microvoid, and phase boundary of ferrite and bainite is beneficial for restraining generation and extending of microvoid.展开更多
本文研究了热轧 F+(M+B)双相钢线材的生产及其在高强钢丝上的应用.指出在双相钢线材拉拔过程中存在于 F 晶界及尺寸较小的岛状第二相协调 F 变形.而尺寸较大的块状 M 则通过切变破裂直至破碎.这种变形机制使 F+(M+B)双相钢线材不经任何...本文研究了热轧 F+(M+B)双相钢线材的生产及其在高强钢丝上的应用.指出在双相钢线材拉拔过程中存在于 F 晶界及尺寸较小的岛状第二相协调 F 变形.而尺寸较大的块状 M 则通过切变破裂直至破碎.这种变形机制使 F+(M+B)双相钢线材不经任何热处理,就具有总面缩率为97.6%的深加工性能,强度可达1800MPa 以上.本文还对双相钢钢丝的应用进行了研究取得了较好的效果.展开更多
文摘Trace of B and Ga can substitute for Mo in Mn-Si-Cr dual phase steels.The technological process and CCT curves of steels treated with B and Ga are similar to those for Mn-Si-Cr-Mo steel.
基金Sponsored by Fundamental Research Funds for Central Universities of China(FRF-TP-12-046A)Beijing Higher Education Young Elite Teacher Project of China(YETP0355)
文摘Two kinds of C-Si-Mn-Cr series tested steels were designed to obtain dual phase microstructures of ferrite （F） ＋martcnsite （M） or ferrite （F）-bainite （B） with different mechanical properties. Effects of strengthening phase on yielding and fracture behaviours during uniaxial tension of dual phase steel were discussed. Compared with hot-rolled martensite dual phase steel, ferrite-bainite dual phase steel has high ratio of yield strength to tensile strength （YS/TS） and low elongation. During necking process of uniaxial tension, microvoids of ferrite-martensite steel are generated by fracture of ferrite/martensite boundary or martensite islands with irregular shape. But ferrite matrix elongated remarkably along deformation direction, and strengthening phase also coordinated with ferrite matrix. Compatible de formation between ferrite and bainite is distinct. Ferrite-bainite dual phase steel has fine and less microvoid, and phase boundary of ferrite and bainite is beneficial for restraining generation and extending of microvoid.
文摘本文研究了热轧 F+(M+B)双相钢线材的生产及其在高强钢丝上的应用.指出在双相钢线材拉拔过程中存在于 F 晶界及尺寸较小的岛状第二相协调 F 变形.而尺寸较大的块状 M 则通过切变破裂直至破碎.这种变形机制使 F+(M+B)双相钢线材不经任何热处理,就具有总面缩率为97.6%的深加工性能,强度可达1800MPa 以上.本文还对双相钢钢丝的应用进行了研究取得了较好的效果.
文摘研究了5CrMnMo 钢渗碳并经马氏体(M)与贝氏体(B)复相处理后的力学性能与冲击磨损机理。结果表明,冲击加滑动产生脱层磨损;渗碳后马氏体(M)/下贝氏体(B_下)组织中 B_下量增加,韧性塑性可明显提高,B_下量达到一定值时,其抗冲击磨损能力最高;无论是先 M后 B_下组织还是先 B_下后 M 组织,只要含有一定量的 B_下都能提高材料的韧性塑性和耐磨性,但先 B_下后 M 的组织性能更好。看来渗碳加 M 与 B_下复相处理可作为提高中碳钢冷作模具寿命的一条新的有效途径。
