理化检验-物理分册
理化檢驗-物理分冊
이화검험-물리분책
Physical Testing and Chemical Analysis Part A:Physical Testing
2015年
10期
751-754
,共4页
接套体%裂纹%高硬度钢%校正%残余应力%酸洗磷化%氢脆裂纹
接套體%裂紋%高硬度鋼%校正%殘餘應力%痠洗燐化%氫脆裂紋
접투체%렬문%고경도강%교정%잔여응력%산세린화%경취렬문
splicing sleeve body%crack%high hardness steel%correction%residual stress%pickling and phosphating%hydrogen embrittlement crack
某特种产品接套体在黑色磷化后磁粉探伤时陆续发现裂纹，采用宏微观断口分析、X 射线能谱分析、金相检验及硬度测试等方法对零件开裂原因进行了分析。结果表明：该特种产品接套体材料为高硬度钢，氢脆敏感性较大；由于该零件在装配时违反了正常工艺流程，先采用油压机装配，装配后才对表尺座燕尾槽部位与孔轴心线的对称度进行校正，该种不正常的操作程序导致校正后零件内孔壁薄板 R 过渡拐点部位残余应力加大，加上该零件本身内应力较大，从而在随后的酸洗磷化过程中发生氢渗入开裂，形成氢脆裂纹。
某特種產品接套體在黑色燐化後磁粉探傷時陸續髮現裂紋，採用宏微觀斷口分析、X 射線能譜分析、金相檢驗及硬度測試等方法對零件開裂原因進行瞭分析。結果錶明：該特種產品接套體材料為高硬度鋼，氫脆敏感性較大；由于該零件在裝配時違反瞭正常工藝流程，先採用油壓機裝配，裝配後纔對錶呎座燕尾槽部位與孔軸心線的對稱度進行校正，該種不正常的操作程序導緻校正後零件內孔壁薄闆 R 過渡枴點部位殘餘應力加大，加上該零件本身內應力較大，從而在隨後的痠洗燐化過程中髮生氫滲入開裂，形成氫脆裂紋。
모특충산품접투체재흑색린화후자분탐상시륙속발현렬문，채용굉미관단구분석、X 사선능보분석、금상검험급경도측시등방법대령건개렬원인진행료분석。결과표명：해특충산품접투체재료위고경도강，경취민감성교대；유우해령건재장배시위반료정상공예류정，선채용유압궤장배，장배후재대표척좌연미조부위여공축심선적대칭도진행교정，해충불정상적조작정서도치교정후령건내공벽박판 R 과도괴점부위잔여응력가대，가상해령건본신내응력교대，종이재수후적산세린화과정중발생경삼입개렬，형성경취렬문。
Cracks were found in a batch of special products of splicing sleeve bodies when they were magnetic particle inspected after black phosphating,and means such as macro and micro fracture analysis,X-ray energy spectrum analysis,metallographic examination and hardness test were used to analyze the cracking reasons.The results show that the material of the splicing sleeve body was high hardness steel with high hydrogen embrittlement sensitivity.The assembly sequence of the parts violated the normal process,with first assembling by hydraulic machine,and then correcting the degree of symmetry between the dovetail groove and the hole axis.The abnormal assembling procedure increased the residual stress of the inner hole wall sheet R transition position of the parts.At the same time,the internal stress of the part itself was rather high,so hydrogen infiltration cracking happened and hydrogen embrittlement cracks formed during the process of pickling and phosphating.
