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一前言随着碳氮共渗新工艺的推广应用,对碳氮共渗过程中渗氮问题的探讨愈来愈多。近年来,许多资料对20Cr2Ni4A、18CrNiWA,18Cr2Ni4WA、30Cr-MnSiNi_2A等高合金高强度钢零件碳氮共渗中的氢脆和氢裂作了报导。本文试图通过对主动圆锥齿轮(以下简称角齿)装配断裂,放置开裂,使用过程断裂的失效件,进行分析找出其断裂原因,并通过试验进一步证明这是一种氢脆现象。而渗氢则是碳氮共渗的结果。它表现为延迟断裂和延迟开裂。产生在碳氮共渗直接淬火低温回火角齿的镀铜部分。通过不同的工艺试验,找出影响氢脆的某些因素及消除氢脆防止角齿断裂的工艺措施。二生产实践中出现的氢脆和氢裂 1 工艺概况角齿(图1),材料为20CrMnTi钢,要求碳氮共渗层深度0.6～0.9mm,表面硬度HRC59～63,心部
A foreword With the popularization and application of the new process of carbonitriding, nitriding in the process of carbonitriding more and more discussion. In recent years, many reports on hydrogen embrittlement and hydrogen cracking in carbonitriding of 20Cr2Ni4A, 18CrNiWA, 18Cr2Ni4WA, 30Cr-MnSiNi_2A and other high-alloy high strength steel parts were reported. In this paper, we try to find out the cause of the fracture by assembling and breaking the active bevel gear (hereinafter referred to as the corner tooth), placing the crack and using the broken parts of the process to analyze and find out the reason of the fracture, and further prove that it is a hydrogen embrittlement phenomenon. Hydrogen permeation is the result of carbonitriding. It is manifested as delayed fracture and delayed cracking. Produced in the carbonitriding direct quenching low temperature tempering corner copper plating parts. Through different technological tests, find out some factors that affect the hydrogen embrittlement and eliminate the technical measures to prevent the teeth from breaking by hydrogen embrittlement. Second production practice appears hydrogen embrittlement and hydrogen cracking 1 process profile corner teeth (Figure 1), the material is 20CrMnTi steel, requiring carbonitriding depth of 0.6 ~ 0.9mm, surface hardness HRC59 ~ 63, the heart