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一、概况 我厂炮用零件——闩体选用材料PCrNi3MoVA钢,规格φ140×225mm,在火焰反射炉中加热,用三吨模锻机型锻成毛坯,经正火、高温回火、粗加工、调质处理。调质后检查硬度、机械性能、低倍组织、断口。发现零件局部区域低倍组织上有粗晶现象(见图1),晶粒度一级,断口为纤维状及少量过热小平面(见图2),硬度及机械性
First, the general situation I plant with gun parts - bolt material selection PCrNi3MoVA steel, size φ140 × 225mm, heated in a flame-reflecting furnace, with a three-ton forging forging rough, normalizing, high temperature tempering, roughing , Quenched and tempered. After quenching check hardness, mechanical properties, low magnification, fracture. It was found that the macrostructure of coarse part in the local area of the part has the phenomenon of coarse grain (see Figure 1), the grain size is first grade, the fracture is fibrous and a few superheated facets (see Figure 2), the hardness and the mechanical