1. Yam Yuav Tsum Tau Ua Raws Cai (Yuav tsum tau ua)
Txias khoov xeem dhau: Ib GB / T 4171, Q235NH yuav tsum xeem dhau 180℃txias dabtsi yog khoov nrog lub vojvoog khoov (piv txwv li, d=1.5a rau t Tsawg dua lossis sib npaug li 16 hli, qhov twg d=mandrel txoj kab uas hla thiab=phaj thickness) tsis muaj kab nrib pleb, delamination / tawm sab hauv. Qhov no ua kom cov khoom seem ntawm cov kev ntxhov siab tom qab txias bending tsis tshaj nws cov yas deformation muaj peev xwm thiab yuav tsis ua rau tsis ua hauj lwm tam sim ntawd.
Tsis muaj kev cuam tshuam rau kev ua haujlwm ntawm cov qauv: Residual stress yuav tsum tsis txhob txo cov hlau yield zog (Ntau tshaj los yog sib npaug rau 235 MPa rau t Tsawg tshaj los yog sib npaug rau 16 hli), tensile zog (360–510 MPa), los yog elongation (Ntau tshaj los yog sib npaug rau 25% rau t Tsawg tshaj los yog sib npaug rau 16 hli) hauv qab tus qauv pib.
2. Kev lag luam-Tau Txais Cov Kev Ruaj Ntseg Ntawm Kev Ruaj Ntseg (Cov Lus Qhia Ua Tau Zoo)
General structural applications: Compressive residual stress Tsawg dua lossis sib npaug li 200 MPa; tensile residual stress Tsawg dua lossis sib npaug li 0.6 × tawm lub zog (Less tshaj lossis sib npaug rau 141 MPa rau Q235NH). Qhov no tiv thaiv kev ntxhov siab corrosion cracking thiab ua kom muaj qhov ruaj khov thaum lub sijhawm ua haujlwm.
Cov khoom tseem ceeb (piv txwv li, txuas hniav, yees): Tensile residual stress Tsawg dua lossis sib npaug li 0.4 × yield zog (tsawg dua lossis sib npaug li 94 MPa) txhawm rau txhim kho kev qaug zog thiab kev tiv thaiv corrosion.
3. Tej yam uas cuam tshuam rau kev ntxhov siab tom qab txias khoov
Khoov vojvoog thiab thickness: me me khoov radii (d/a<1.5) or thicker plates (t>16 mm) increase residual stress; thicker plates typically require a larger bend radius (e.g., d=2a for t>16 hli) kom muaj kev ntxhov siab nyob rau hauv qhov txwv tsis pub muaj kev nyab xeeb.
Tshaj tawm - khoov kev ntxhov siab: Rau cov ntawv thov tseem ceeb, kev ntxhov siab rau kev ntxhov siab (550-650℃rau 1-2 teev, ua raws li cov cua txias) tuaj yeem txo cov kev ntxhov siab seem ntawm 30-50%, kom ua raws li cov kev txwv nruj dua.
4. Kev Tshawb Fawb thiab Kev Tshawb Fawb
Tsis yog -kev kuaj kev puas tsuaj (NDT): X-ray diffraction lossis kuaj ultrasonic tuaj yeem ntsuas qhov kev ntxhov siab nyob ntawm qhov khoov.
Kev kuaj kev puas tsuaj: Lub qhov-txoj kev tho (ib ASTM E837 lossis GB/T 31310) feem ntau yog siv rau qhov ntsuas qhov kev ntxhov siab nyob hauv qhov txias - cov cheeb tsam tsim.
