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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Cleavage Initiation in Ti-V-N and V-N Microalloyed Forging Steels
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Cleavage Initiation in Ti-V-N and V-N Microalloyed Forging Steels

机译：Ti-V-N和V-N微合金锻钢的开裂开始

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摘要

The effects of matrix microstructure and features of non-metallic inclusion (morphology, type, volume fraction and size) on cleavage initiation in medium-carbon Ti-V-N and V-N microalloyed resulphurized forging steels have been determined by examining fracture surfaces produced in room temperature Charpy impact tests. The steels were generally Al-deoxidised but one V-N steel was Si-deoxidised. It has been found that, in the Ti-treated steel, having a ferrite-pearlite microstructure, brittle fracture initiation occurred at cracked coarse (Ti,V)(C,N) single phase or [(Ti,V)(C,N)/Al_2O_3/MnS] multi-phase inclusions. In the Ti-free steels, cleavage initiation was dependent on matrix microstructure and non-metallic inclusions. In the low strength Ti-free steels, with a ferrite-pearlite microstructure, the absence of a continuous grain boundary ferrite layer led to initiation from interfacing pearlite colonies. For the bainitic microstructure, cleavage initiated close to the notch, but the microstructural feature responsible could not be identified. For the ferrite-pearlite microstructure in the Si-deoxidised V-N steel, cleavage initiated at cracked Mn-Al-(Ca) silicate inclusions. The higher matrix strength and more continuous nature of grain boundary allotriomorphic ferrite in the V-N steel deoxidised with Al was associated with cleavage initiation from V-rich (V,Ti)(C,N)-containing inclusions. These were generally of smaller size than those in the Ti-treated steels.
机译：通过检查室温下的夏比断裂，确定了基体组织和非金属夹杂物的特征（形态，类型，体积分数和尺寸）对中碳Ti-VN和VN微合金化再硫化锻造钢的解理起始的影响。冲击测试。这些钢通常经过Al脱氧，而一种V-N钢则经过Si脱氧。已经发现，在具有铁素体-珠光体显微组织的Ti处理的钢中，在开裂的粗（Ti，V）（C，N）单相或[（Ti，V）（C，N）上发生脆性断裂起始。 ）/ Al_2O_3 / MnS]多相夹杂物。在无钛钢中，解理起始取决于基体组织和非金属夹杂物。在具有铁素体-珠光体显微组织的低强度无钛钢中，不存在连续的晶界铁素体层会导致界面珍珠岩菌落的萌生。对于贝氏体微观结构，开裂接近于缺口，但是无法识别负责的微观结构特征。对于硅脱氧的V-N钢中的铁素体-珠光体显微组织，在开裂的Mn-Al-（Ca）硅酸盐夹杂物处发生解理。用Al脱氧的V-N钢中较高的基体强度和晶界同素异形铁素体的连续性与富V（V，Ti）（C，N）夹杂物的裂解起始有关。它们的尺寸通常比经过Ti处理的钢的尺寸小。

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