Why distortion occurs
Uneven cooling creates temperature differences and thermal stress. Transformations change volume and mechanical behaviour. These interact with initial stress, geometry and restraint to determine dimensional change.
Higher hardenability does not automatically mean more distortion, and no medium class guarantees minimum distortion for every workpiece.
Create comparable dimensional records
Measure the same locations before and after quenching using consistent datums and conditions. Check bending and runout for shafts, roundness and end faces for rings, and flatness for plates, as required by the drawing.
Record loading orientation, support positions and measurement directions so dimensional changes can be related to cooling conditions.
Check cooling and loading together
Check changes in bath temperature, concentration and condition, then flow, shielding and support contact around the part. Inner and outer positions or upper and lower layers may cool differently in the same tank.
For heavy or asymmetric parts, internal measurements can compare cooling at critical locations. After fixture changes, check whether medium access and restraint have changed too.
How quenchants and fixtures support optimisation
Medium selection balances microstructure and distortion control. Discuss AR-HCCI for high-chromium cast iron, AR-SAG for large Cr–Mo steel liners and AR-GP or other suitable products for conventional steel parts.
SYQ-2 compares working-fluid cooling, internal measurement records actual part temperatures, and dedicated fixtures address specified operations. Ask about any one product without buying all equipment. The fixture page explains its design method.
Evaluate improvements using comparable results
Compare dimensions, hardness, microstructure and crack checks under matched conditions before and after changes—not just one best example. Hardness and distortion may need joint adjustment; a fixed percentage reduction cannot be promised for every part.
When you need help
Describe geometry, distortion location and approximate change. Before-and-after measurements help, but complete data are not required to ask about fixtures or products.